UAL


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue
dei:LegalEntity
us-gaap:CommonStockParOrStatedValuePerShare
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
dei:LegalEntity
us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding
dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:Revenues

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
dei:LegalEntity
us-gaap:AirlineDestinations
us-gaap:ProductOrService
us-gaap:ProductOrService, dei:LegalEntity
us-gaap:ProductOrService, us-gaap:TypeOfArrangement

us-gaap:CostsAndExpenses
dei:LegalEntity

us-gaap:OperatingIncomeLoss
dei:LegalEntity

us-gaap:OtherNonoperatingIncomeExpense
dei:LegalEntity

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
dei:LegalEntity

us-gaap:NonoperatingIncomeExpense
dei:LegalEntity

us-gaap:IncomeTaxExpenseBenefit
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTax
dei:LegalEntity

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:Assets
dei:LegalEntity

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AssetsCurrent
dei:LegalEntity

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity

us-gaap:ShortTermInvestments
dei:LegalEntity

us-gaap:ReceivablesNetCurrent
dei:LegalEntity

us-gaap:PrepaidExpenseAndOtherAssetsCurrent
dei:LegalEntity

us-gaap:PropertyPlantAndEquipmentGross
dei:LegalEntity

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
dei:LegalEntity

us-gaap:PropertyPlantAndEquipmentNet
dei:LegalEntity

us-gaap:IntangibleAssetsNetExcludingGoodwill
dei:LegalEntity

us-gaap:OtherAssetsNoncurrent
dei:LegalEntity

us-gaap:LiabilitiesCurrent
dei:LegalEntity

us-gaap:LongTermDebtCurrent
dei:LegalEntity

us-gaap:AccountsPayableCurrent
dei:LegalEntity

us-gaap:OtherLiabilitiesCurrent
dei:LegalEntity
dei:LegalEntity
us-gaap:LongTermDebt
us-gaap:DebtInstrument
us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtNoncurrent
dei:LegalEntity
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit
dei:LegalEntity

us-gaap:TreasuryStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:RepaymentsOfLongTermDebt
dei:LegalEntity

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:RepaymentsOfLongTermDebt
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:DeferredTaxLiabilities
dei:LegalEntity

us-gaap:DeferredTaxAssetsNet
dei:LegalEntity

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
dei:LegalEntity

us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity
dei:LegalEntity
ual:CapitalContributionsToParent
us-gaap:StatementEquityComponents, dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
ual:DebtInstrumentVariableRateFloor
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:TitleOfIndividual
ual:ExecutiveAndDirectorCompensationVoluntaryDecreaseInSalaryPercent

ual:FinanceLeaseConversionFromOperatingLeaseRecordedPropertyPlantAndEquipment
dei:LegalEntity
us-gaap:ProductOrService
ual:FrequentFlyerMileageMilesAwardedInPeriod

ual:GainLossOnFinancialInstrumentsNonOperating

ual:GainLossOnSaleOfOtherAssetsAndOtherMiscellaneousCharges

ual:IncomeTaxExpenseBenefitSpecialCharges
us-gaap:ProductOrService
ual:NonTravelMilesRedemptionFrequentFlyerDeferredRevenue

ual:OtherComprehensiveIncomeInvestmentsAndOtherNetOfTax
dei:LegalEntity
dei:LegalEntity
ual:PaymentsOfDividendsToParentCompany
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
ual:ProceedsFromIssuanceOfLongTermDebtExpected

ual:SpecialChargesAndLossesOnFinancialInstrumentsNonOperatingBeforeTax

ual:SpecialItemsNetOfIncomeTaxBenefits
us-gaap:ProductOrService
ual:TravelMilesRedemptionFrequentFlyerDeferredRevenue
us-gaap:StatementScenario
ual:UnusualOrInfrequentItemsPercentOfCapacityCut
us-gaap:SubsequentEventType

ual:VariableAndShortTermLeaseCost

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AircraftMaintenanceMaterialsAndRepairs
dei:LegalEntity

us-gaap:AircraftRental
dei:LegalEntity

us-gaap:AirlineCapacityPurchaseArrangements
dei:LegalEntity

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AssetImpairmentCharges

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
dei:LegalEntity
us-gaap:ProductOrService
us-gaap:ContractWithCustomerLiabilityRevenueRecognized
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanContributionsByEmployer
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DepreciationAndAmortization
dei:LegalEntity

us-gaap:EarningsPerShareBasicAndDiluted
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquitySecuritiesFvNiGainLoss
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeasePrincipalPayments
dei:LegalEntity

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:FuelCosts
dei:LegalEntity

us-gaap:GainLossOnDispositionOfAssets1
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestCostsCapitalizedAdjustment
dei:LegalEntity

us-gaap:InterestCostsIncurred
dei:LegalEntity

us-gaap:InvestmentIncomeInterest
dei:LegalEntity

us-gaap:LaborAndRelatedExpense
dei:LegalEntity

us-gaap:LandingFeesAndOtherRentals
dei:LegalEntity

us-gaap:LeaseCost

us-gaap:NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
dei:LegalEntity

us-gaap:OtherCostAndExpenseOperating
dei:LegalEntity

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
dei:LegalEntity

us-gaap:PaymentsOfDebtIssuanceCosts
dei:LegalEntity

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates
dei:LegalEntity

us-gaap:PaymentsToAcquireLoansReceivable
dei:LegalEntity

us-gaap:PaymentsToAcquireProductiveAssets
dei:LegalEntity

us-gaap:PaymentsToAcquireShortTermInvestments
dei:LegalEntity

us-gaap:PostemploymentBenefitsPeriodExpense
us-gaap:TitleOfIndividual

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
dei:LegalEntity

us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments
dei:LegalEntity

us-gaap:ProceedsFromShortTermDebt
dei:LegalEntity

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:CounterpartyName, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:RestructuringSettlementAndImpairmentProvisions
dei:LegalEntity
us-gaap:CounterpartyName

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability
dei:LegalEntity

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
dei:LegalEntity

us-gaap:SellingExpense
dei:LegalEntity
us-gaap:SubsequentEventType
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:StockholdersEquityOther
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:SubleaseIncome
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:UnrealizedGainLossOnDerivatives

us-gaap:UnrealizedGainLossOnInvestments
dei:LegalEntity

dei:EntityCommonStockSharesOutstanding
dei:LegalEntity

ual:ContractWithCustomerLiabilityCurrentAdvanceTicketSales
dei:LegalEntity

ual:ContractWithCustomerLiabilityCurrentFrequentFlyer
dei:LegalEntity

ual:ContractWithCustomerLiabilityNoncurrentFrequentFlyer
dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
ual:DebtInstrumentCovenantMinimumRequiredUnrestrictedCashAndCashEquivalentsAndUnusedCommitments
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
ual:DebtInstrumentCovenantRatioOfCollateralToOutstandingObligationsMinimum
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
ual:DebtInstrumentPercentageIncreaseInFaceAmountUponDisbursements

ual:DeferredTaxAssetLeasingArrangements
dei:LegalEntity
us-gaap:RetirementPlanType
ual:DefinedBenefitPlanEffectOf50BasisPointDecreaseInDiscountRateOnAccumulatedPostretirementBenefitObligation
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
ual:EquitySecuritiesWithoutReadilyDeterminableFairValueOwnershipInterest
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument
us-gaap:StatementGeographical, us-gaap:SubsequentEventType
ual:IncreaseDecreaseInDemandDueToTravelRestrictionsPercent
us-gaap:AircraftType
ual:NumberOfAircraftExpectedToTakeDeliveryNextTwelveMonths
us-gaap:ProductOrService
ual:NumberOfAircraftSubjectToFinanceLeases
us-gaap:ProductOrService
ual:NumberOfAircraftSubjectToOperatingLeases
us-gaap:AircraftType, us-gaap:SubsequentEventType
ual:NumberOfAircraftSubjectToPurchaseRightsAssignmentAgreement
us-gaap:AircraftType
ual:NumberOfAircraftsExpectedToTakeDeliveryRemainderOfYear
us-gaap:AircraftType
ual:NumberOfAircraftsExpectedToTakeDeliveryThereafter
us-gaap:AircraftType
ual:NumberOfAircraftsExpectedToTakeDeliveryYearTwo

ual:OtherLiabilitiesAndDeferredCreditsNoncurrent
dei:LegalEntity
us-gaap:SubsequentEventType
ual:PayrollSupportProgramFundingProvided

ual:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization
dei:LegalEntity

ual:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
dei:LegalEntity

ual:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ual:RestrictedCashFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService, us-gaap:RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased, dei:LegalEntity
us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:AdditionalPaidInCapitalCommonStock
dei:LegalEntity

us-gaap:AirlineRelatedInventoryNet
dei:LegalEntity

us-gaap:AirlineRelatedInventoryValuationReserves
dei:LegalEntity

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:AociBeforeTaxAttributableToParent

us-gaap:AociTaxAttributableToParent

us-gaap:CapitalizedComputerSoftwareGross
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency
us-gaap:ClassOfWarrantOrRight, us-gaap:SubsequentEventType
us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
us-gaap:SubsequentEventType
us-gaap:ProductOrService
us-gaap:ContractWithCustomerLiability

us-gaap:ContractualObligation
us-gaap:DebtInstrument

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
dei:LegalEntity
us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities
dei:LegalEntity

us-gaap:DeferredIncomeTaxLiabilitiesNet
dei:LegalEntity

us-gaap:DeferredTaxAssetsDeferredIncome
dei:LegalEntity

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards
dei:LegalEntity

us-gaap:DeferredTaxAssetsOther
dei:LegalEntity

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesLeasingArrangements
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
dei:LegalEntity

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent
dei:LegalEntity
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
us-gaap:Range, us-gaap:DefinedBenefitPlanByPlanAssetCategories, dei:LegalEntity
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

us-gaap:DepositsOnFlightEquipment
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeAssets
us-gaap:FairValueByMeasurementFrequency

us-gaap:EmployeeRelatedLiabilitiesCurrent
dei:LegalEntity

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:AwardType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage

us-gaap:EquitySecuritiesFvNi
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:FinanceLeaseLiabilityCurrent
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityNoncurrent
dei:LegalEntity

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinancingReceivableAllowanceForCreditLosses
dei:LegalEntity

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
dei:LegalEntity
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FlightEquipmentGross
dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:GuaranteeObligationsByNature
us-gaap:GuaranteeObligationsCurrentCarryingValue
us-gaap:DebtInstrument
us-gaap:GuaranteeObligationsMaximumExposure
us-gaap:DebtInstrument, us-gaap:GuaranteeObligationsByNature
us-gaap:LongtermDebtType

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:InvestmentsAndOtherNoncurrentAssets
dei:LegalEntity
us-gaap:CreditFacility, us-gaap:FinancialInstrument, dei:LegalEntity
us-gaap:LineOfCredit
us-gaap:GuaranteeObligationsByNature, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:LongTermDebtFairValue
us-gaap:FairValueByMeasurementBasis

us-gaap:NotesAndLoansReceivableNetNoncurrent
dei:LegalEntity

us-gaap:OperatingLeaseLiabilityCurrent
dei:LegalEntity

us-gaap:OperatingLeaseLiabilityNoncurrent
dei:LegalEntity

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
ual:NetOperatingLossCarryforwardByExpiration
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:OtherCommitments, us-gaap:SubsequentEventType
us-gaap:OtherCommitment
us-gaap:OtherCommitments, us-gaap:SubsequentEventType, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:OtherLongTermInvestments
us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
dei:LegalEntity
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PropertyPlantAndEquipmentOther
dei:LegalEntity
dei:LegalEntity
us-gaap:ReceivableFromShareholdersOrAffiliatesForIssuanceOfCapitalStock
us-gaap:BalanceSheetLocation
us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
us-gaap:BalanceSheetLocation, dei:LegalEntity

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent
dei:LegalEntity
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AircraftType
us-gaap:UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired
us-gaap:ValuationAllowancesAndReservesType, dei:LegalEntity
us-gaap:ValuationAllowancesAndReservesBalance

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄▄▄▄▄▄███████████████▄▄▄▄▄▄▄▄▄▄▁▁33333333333333444444444444444333333333322NANANA
 us-gaap:CommonStockParOrStatedValuePerShare dei:LegalEntity ual:UnitedAirLinesInc▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁███████0.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.015.05.05.05.05.05.05.0NA5.0NANANANANA
 us-gaap:CommonStockParOrStatedValuePerShare us-gaap:SubsequentEventType,us-gaap:SubsidiarySaleOfStock us-gaap:SubsequentEvent,ual:PublicOfferingNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 248NA256261268NA273275284NA300307314NA321331355NA376380384NA392396368NA395394394NANA332393NANA392400NANA235235NANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 248NA255260267NA272274283NA299306313NA320331354NA375380382NA370373368NA357341341NANA331331NANA330330NANA168168NANANA
us-gaap:EarningsPerShareBasic NA2.544.014.031.091.713.072.490.521.992.122.670.311.263.021.780.882.2412.833.141.330.082.492.11-1.660.391.061.371.37-1.26-1.870.021.02-1.36-0.421.971.63-0.65-1.012.31.62-0.49-0.390.19
us-gaap:EarningsPerShareDiluted NA2.533.994.021.091.73.062.480.521.992.122.660.311.263.011.780.882.2412.823.141.320.072.372.01-1.660.370.981.211.21-1.26-1.870.020.89-1.36-0.421.691.39-0.65-1.011.751.29-0.49-0.390.19
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:Revenues ▅███▆▇█▇▆▆▇▇▅▆▇▆▅▆▇▇▅▆▇▇▅▆▇▇▇▅▅▇▇▅▆▇▆▅▅▂▂▁▁▁7979108881138011402958910491110031077790329438987810000842090529913939681959036103069914860893131056310329869693291022810001100018721870299099939860289281017198098202846453945161424144334018
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▅███▆▇█▇▆▆▇▇▅▆▇▆▅▆▇▇▅▆▇▇▅▆▇▇▇▅▅▇▇▅▆▇▆▅▅▂▂▁▁▁7979108881138011402958910491110031077790329451989910008842690529913939681959036103069914860893131056310329869693291022810001100018721870299099939860289281017198098202846453945161424144334018
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity ual:UnitedAirLinesInc▄▇██▆▇█▇▅▆▆▇▅▆▆▆▅▆▇▆▅▆▇▇▅▆▇▇▇▅▁▂▂▁79791088811380114029589104911100310777903294519899100008420905499139396819590361030699148608931310563103298696933110230100031000387235055565654754775NA585755704676NA54195163NANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AirlineDestinations us-gaap:AtlanticDestination▁▅██▃▅█▇▂121517602103206614581676207319651389NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AirlineDestinations us-gaap:LatinAmericaDestination▃▇▅▆█▂▁▁▆880959903943975857829838936NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService us-gaap:Passenger▁▇██▄▆▇▇70659933104811048687259556101209880NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,dei:LegalEntity us-gaap:Passenger,ual:UnitedAirLinesInc▁▇██▄▆▇▇70659933104811048687259556101209880NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▅███▅▇▇▇▄▄▄▄▃▂▃▃▁▂▃▄▂▄▆▆▅▅▇▆▆▅▆▇▆▅89511002799079930909498399800961687568709878686018142804782898336754679558407846978678688937294239045909497209231923189859167970993648873NA923690018168NA48594727416543453911
 us-gaap:CostsAndExpenses dei:LegalEntity ual:UnitedAirLinesInc▆███▇██▇▆▆▆▆▅▅▆▆▄▅▆▆▅▆▇▇▇▇█▇▇▇▂▂▁▁89511002799069930909398389800961687558708878686008142804582898336754579558406846878678687937794239037909397209230923089855534565753915083NA527851334668NA48704720NANANA
us-gaap:OperatingIncomeLoss ▁▅▇▇▅▅▆▆▄▅▆▇▄▆▇▆▅▆█▇▅▅▆▆▃▄▅▅▅▃▂▄▅▃▃▆▅▃▃▅▄▄▄▄-9728611473147249565212031161276729109213992781005162410606491081189914457416251191906-349235508770770-264-465200575-2714593580834-825354347688107
us-gaap:OtherNonoperatingIncomeExpense ▁▇████▇▆███▇▇▇██▇▇▆▇▇▃▇█▇██▆▆███▇█-699-59914943-1-16648615-1-17-825-18-31-147-100-74-443-10654-895152-123-12323194-3827NA-64-29-1NA15324-1035
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▁▇██▆▆▇▇▅▆▇▇▅▇█▇▆▇█▇▆▅▇▆▄▅▆▆▆▄-2114844134913543675561061857184600980127414588415109314949051606119751123920791-606112382471471-426NANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▁█▇▇▇█▇▆█▇▇▇▇▇▇▇▇▇▆▇▇▄▆▇▇▇▇▆▆▇▇▇▇▇-1142-17-124-118-128-96-142-304-92-129-112-125-133-121-114-129-155-176-293-248-230-602-271-115-257-123-126-299-299-162-167-185-235-176NA-275-266-245NA-149-163-158-150-93
us-gaap:IncomeTaxExpenseBenefit ▆▇██▇▇▇▇▇▇██▇███▇▇▁▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇-410203325302759422517337203434564948754534318182-321043-6-423-7322-9-9911-2742NANA-21-4-13
us-gaap:ComprehensiveIncomeNetOfTax ▁▃▄▄▃▄▄▄▃▃▄▄▃▃▄▄▃▄█▄▄▁▄▄▂▄▃▄▄▂▁▃▃▃-1757427132710383027428496961803756578108936690163136792646941358610-1439723798-6371241455927927-398-1347186120-311NA36824156NANANANANANA
us-gaap:NetIncomeLoss ▁▄▄▄▃▃▄▄▃▃▄▄▃▃▄▃▃▄█▄▃▃▄▄▂▃▃▃▃▂▂▃▃▂▃▄▃▃▂▃▃▃▃▃-170464110241052292462836684147580637818963979655883138234816119350828924789-609140379469469-417-6206339-448-138653538-213-325387273-82-5728
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▁▄▄▄▃▃▄▄▃▃▄▄▃▃▄▃▃▄█▄▃▃▄▄▂▃▃▃▃-170464110241052292462836684147580637818963979655883138234816119350830923788-609139378468468NA-6206338-448NA651536-213NA387273NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:Assets ████▇▆▆▆▆▆▆▆▆▅▅▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▁▁5305552611521995215050639447924483744691440184232642565423074144540140403274047640373408614186939367390913735338011384473718536812372603746837468368423762837905386943819937988390543969440552395982005520134NANANA
 us-gaap:Assets dei:LegalEntity ual:UnitedAirLinesInc█████▆▆▆▆▆▆▆▆▅▅▅▅▆▆▅▅▅▅▅▅▅▅▅▅▅▂▂▂▂▁▁▁53049526055219352144506334478644832446854401342320425584225841395400914032840477403734086141870394093913438108385523893137806372863785338077380773747820802216052256321779182451883819160NA19628NANANANANA
us-gaap:LiabilitiesAndStockholdersEquity ████▇▆▆▆▆▆▆▆▆▅▅▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▁▁5305552611521995215050639447924483744691440184232642565423074144540140403274047640373408614186939367390913735338011384473718536812372603746837468368423762837905386943819937988390543969440552395982005520134NANANA
 us-gaap:LiabilitiesAndStockholdersEquity dei:LegalEntity ual:UnitedAirLinesInc█████▆▆▆▆▆▆▆▆▅▅▅▅▆▆▅▅▅▅▅▅▅▅▅▅▅▂▂▂▂▁▁▁53049526055219352144506334478644832446854401342320425584225841395400914032840477403734086141870394093913438108385523893137806372863785338077380773747820802216052256321779182451883819160NA19628NANANANANA
us-gaap:StockholdersEquity ▇██▇▇▇▇▇▆▇▇▇▆▇▆▆▆▇▇▄▄▄▄▄▄▄▃▃▃▂▃▃▃▃▃▃▃▃▃▁▁941811531113011032098029995946986398336880689708854844986598439778478408966855541223008239638643347257929841728121712179448118271635151018062312194219121727-2206-2756NANANA
 us-gaap:StockholdersEquity dei:LegalEntity ual:UnitedAirLinesInc▇██▇▇▇▇▇▆▇▇▇▇▇▇▆▆▇▇▅▄▄▅▄▄▄▄▃▃▃▁▁▁▁▂▂▂93801149211263102829763995794328602829887688915879983948606843577807836896385524160304626354199357728573223224617871787840-3184-2470-2447-2248-1904-1719-1950NA-1977NANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▄█▆▄▁▇▅▃▁▄6096612961116096608061206105609160776098NANANA6569NANANA7946NANANA7721NANANA7425NANANANA7145NANANA7114NANANA7071NANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▆█▇▆▄▄▃▂▁▁7991971690758050699966686252541947364621NANANA3427NANANA3457NANANA-3883NANANA-5015NANANANA-5586NANANA-4863NANANA-5703NANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,ual:UnitedAirLinesInc▅█▇▆▅▅▄▂▁▁1030212353119091123010612103199856902283398201NANANA5851NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:AssetsCurrent ▂▂▃▃▂▁▃▃▂▁▂▂▂▁▂▂▁▂▅▃▄▂▄▄▃▃▄▄▄▃▄▅▆▆▆▇▇█▇▁▁790581948533891076087194867188818287711378778248772473097970784472247828100978793950981389225961987888702938996219621914810049107741170811261109971198612391131481204570706983NANANA
 us-gaap:AssetsCurrent dei:LegalEntity ual:UnitedAirLinesInc▄▅▅▆▄▃▆▆▅▃▄▅▄▃▄▄▃▄█▆▇▅▇▇▆▆▇██▇▅▆▇▅▁▂▂78998188852789047602718886658875828271077870824377197303801378877267786910137883595518181926896548824869596089837983793728492915298008270589965466710NA6901NANANANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▃▂▃▃▁▁▂▂▂▁▁▂▂▂▂▂▁▃▃▂▃▂▃▃▃▃▄▄▄▃▄▅▆▅▆▇▇██▅▅▃▂▂34422762295932211848169426212884240414821870237121642179263024831795300634272796335220023117342430093220393541434143353847705129608656066246698475198165806949384906351625252566
 us-gaap:CashAndCashEquivalentsAtCarryingValue dei:LegalEntity ual:UnitedAirLinesInc▅▄▄▅▂▁▃▄▃▁▂▃▂▂▃▃▂▄▅▄▅▂▄▅▄▅▆▆▆▅▄▄▆▅▅▆▆█▇██34362756295332151842168826152878239814761864236521582173262424771789300034212790334619963111341830033214392841374137353227663005407633383458407041074806466549324900NANANA
us-gaap:ShortTermInvestments ▅▇▇▇▇▇▇▇▇▇█▇▇▇▇▇▇▇▇▇▇███▆▆▆▆▆▆▅▅▅▅▄▄▃▁▁1779218221672223221922562314218720712316245822782215224922262202217721902172218922562382239723722015190118011821182118521773155116181667151613731060722611NANANANANA
 us-gaap:ShortTermInvestments dei:LegalEntity ual:UnitedAirLinesInc▆▇▇▇▇▇█▇▇██▇▇▇▇▇▇▇▇▇▇███▇▆▆▆▆▆▂▂▂▂▁▁▁177921822167222322192256231421872071231624582278221522492226220221772190217221892256238223972372201519011801182118211852326346342338275186155NANANANANANANA
us-gaap:ReceivablesNetCurrent ▁▄▅▅▅▃▅▆▅▃▅▄▄▃▄▄▅▃▄▄▄▃▄▅▅▄▅▅▅▅▃▆▆▆▄▅▆█▅▂▂792136416171762178913461752184017601340160314991429117614811450158111281513147114711146155916651609150316931732173216791338186218181908135817131863235716131044971NANANA
 us-gaap:ReceivablesNetCurrent dei:LegalEntity ual:UnitedAirLinesInc▁▅▇▇█▅▇█▇▅▆▆▅▄▆▅▆▃▆▆▆▃▆▇▆▆▇▇▇▇▄▇▆▇▁▂▃7921364161717621789134617521840176013401603149914291176148114501581112815131471147111461559166516091503169317321732167911941686156816417638651103NA1004NANANANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▄▃▂▂▃▅▅▆▇▆▆█▆▄▃▅▅▃▄▄▄▃▄▄▄▂▂▃▃▄▄▄▃▃▁▁▃822814725708780913973102811281051100912181016832791911912740819881826730838839845704700790790845865837797783607595773NA658NANANANANA
 us-gaap:PrepaidExpenseAndOtherAssetsCurrent dei:LegalEntity ual:UnitedAirLinesInc▅▄▄▄▄▅▆▆▇▇▆█▆▅▅▆▆▄▅▅▅▄▅▅▅▄▃▄▄▅▃▃▃▂▁▁▂822814725708780913973102811291051100812191017832840960961787867929874779887887893705685777777841700633619524447413513NA366NANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:PropertyPlantAndEquipmentGross NA4470743485426124232540665NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity ual:UnitedAirLinesIncNA4470743485426124232540665NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
 us-gaap:LongTermDebt dei:LegalEntity ual:UalAndUnited█▅▅▅▄▄▄▄▄▄▃▂▂▁1745614733143241437914124136361328813513139851343113016122661203110891NANANA11042NANANANANANANANANANANANANANANANANANANANANANANANANANA
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:StockholdersEquity ▇██▇▇▇▇▇▆▇▇▇▆▇▆▆▆▇▇▄▄▄▄▄▄▄▃▃▃▂▃▃▃▃▃▃▃▃▃▁▁941811531113011032098029995946986398336880689708854844986598439778478408966855541223008239638643347257929841728121712179448118271635151018062312194219121727-2206-2756NANANA
 us-gaap:StockholdersEquity dei:LegalEntity ual:UnitedAirLinesInc▇██▇▇▇▇▇▆▇▇▇▇▇▇▆▆▇▇▅▄▄▅▄▄▄▄▃▃▃▁▁▁▁▂▂▂93801149211263102829763995794328602829887688915879983948606843577807836896385524160304626354199357728573223224617871787840-3184-2470-2447-2248-1904-1719-1950NA-1977NANANANANA
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us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄▄▄▄▄▄███████████████▄▄▄▄▄▄▄▄▄▄▁▁33333333333333444444444444444333333333322NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▇██▇▇▇▆▆▆▆▆▆▅▅▆▆▅▅▅▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▂▂▁▁▁▁▁7991971690758050699966686203536746844621499143543536342753234358377034572634-2182-3375-3883-3911-4835-5624-5015-5155-5534-5534-6003-5586-4965-4972-5311-4863-4725-5378-5916-5703-5377-5765NANANA
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us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▄▄█▆▄▃▇▅▃▂631181110327101915108490524661709789577NANANANANANANANANANANANA1464694-3342371148114839390-238NA124NANANA1005NANANA482NANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity ual:UnitedAirLinesInc▁▄▄█▆▄▃▇▅▃▂451181110227101886108390524661692789576NANANANANANANANANANANANA1463686-33323611491149389139-489NA168NANANA786NANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▄▇▇▃▁▇▆█▇▄-1572-1329-795-856-1580-1852-886-1022-695-849-1276NANANANANANANANANANANANA-905-427-723-466-402-402-431-1152-230NA-362NANANA-320NANANA-76NANA
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▄▄█▆▄▃▇▅▃▂631181110327101915108490524661709789577NANANANANANANANANANANANA1464694-3342371148114839390-238NA124NANANA1005NANANA482NANA
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us-gaap:NetIncomeLoss ▁▄▄▄▃▃▄▄▃▃▄▄▃▃▄▃▃▄█▄▃▃▄▄▂▃▃▃▃▂▂▃▃▂▃▄▃▃▂▃▃▃▃▃-170464110241052292462836684147580637818963979655883138234816119350828924789-609140379469469-417-6206339-448-138653538-213-325387273-82-5728
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▄▇▇▃▁▇▆█▇▄-1572-1329-795-856-1580-1852-886-1022-695-849-1276NANANANANANANANANANANANA-905-427-723-466-402-402-431-1152-230NA-362NANANA-320NANANA-76NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities █▃▂▂▃▃▃▁▃▂▄2189-47-571-479-183-159-284-963-95-328177NANANANANANANANANANANANA-144-47834221-141-141-1194703-489NA-402NANANA-589NANANA68NANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity ual:UnitedAirLinesInc█▃▂▂▃▃▂▁▃▂▄2207-47-570-479-154-158-284-963-78-328178NANANANANANANANANANANANA-143-47034221-141-141-1191-143-391NA-167NANANA-510NANANANANANA
us-gaap:RepaymentsOfLongTermDebt ▁▃▁▁▁▁▁▇▁▁▁▁▂▂▃▁▁▄▁▇▂▃▇▂▄▁▁▃▃█▁▃2355142532232502082251105189179197210315304458226227650209102329650210892996132202284964961241234462NA479NANANA528NANANA1204NANA
 us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity ual:UnitedAirLinesInc▂▄▂▂▂▂▂▇▂▁▂▂▂▂▃▂▂▄▂▇▂▃▇▂▄▂▂▃▃█▁▃2355142532232502082251105189179197210315304458226227650209102329650210892996132202284964961241104365NA147NANANA397NANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▃▂▃▄▃▂▁▃▄▄▄▃▂▂▂▅█▃▂▂▂▁35321436954951322541440529553579454258172260790139252326525019592NANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:RepaymentsOfLongTermDebt ▁▃▁▁▁▁▁▇▁▁▁▁▂▂▃▁▁▄▁▇▂▃▇▂▄▁▁▃▃█▁▃2355142532232502082251105189179197210315304458226227650209102329650210892996132202284964961241234462NA479NANANA528NANANA1204NANA
 us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity ual:UnitedAirLinesInc▂▄▂▂▂▂▂▇▂▁▂▂▂▂▃▂▂▄▂▇▂▃▇▂▄▂▂▃▃█▁▃2355142532232502082251105189179197210315304458226227650209102329650210892996132202284964961241104365NA147NANANA397NANANANANANA

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value33333333333333444444444444443333333333222
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

dei:LegalEntity

us-gaap:CommonStockParOrStatedValuePerShare

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value0.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.015.05.05.05.05.05.05.05.0
Percentage of CommonStockParOrStatedValuePerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:SubsequentEvent, ual:PublicOffering



Period End2020-04-21
Value0.01
Percentage of CommonStockParOrStatedValuePerShare0.0

Shares Issued

Common Stock Shares Issued

dei:LegalEntity

us-gaap:CommonStockSharesIssued

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value1000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.0205.0205.0205.0205.0205.0
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value247251253257264269272273279286296305311314317322339364373378382374369373373362361355333332332332332330330330329327168168167
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.0205.0205.0205.0205.0205.0205.0205.0
Percentage of CommonStockSharesOutstanding0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value247251253257264269272273279287314364
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-06-302012-09-302012-06-302011-09-302011-06-302010-09-302010-06-30
Value248256261268273275284300307314321331355376380384392396368395394394332393392400235235
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-06-302012-09-302012-06-302011-09-302011-06-302010-09-302010-06-30
Value248255260267272274283299306313320331354375380382370373368357341341331331330330168168
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value2.544.014.031.091.713.072.490.521.992.122.670.311.263.021.780.882.2412.833.141.330.082.492.11-1.660.391.061.371.37-1.26-1.870.021.02-1.36-0.421.971.63-0.65-1.012.31.62-0.49-0.390.19
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value2.533.994.021.091.73.062.480.521.992.122.660.311.263.011.780.882.2412.823.141.320.072.372.01-1.660.370.981.211.21-1.26-1.870.020.89-1.36-0.421.691.39-0.65-1.011.751.29-0.49-0.390.19
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value7979108881138011402958910491110031077790329438987810000842090529913939681959036103069914860893131056310329869693291022810001100018721870299099939860289281017198098202846453945161424144334018
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.099.999.899.999.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value7979108881138011402958910491110031077790329451989910008842690529913939681959036103069914860893131056310329869693291022810001100018721870299099939860289281017198098202846453945161424144334018
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value7979108881138011402958910491110031077790329451989910000842090549913939681959036103069914860893131056310329869693311023010003100038723505556565475477558575570467654195163
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.999.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.058.157.155.155.557.656.857.0100.5100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.999.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.058.157.155.155.557.656.857.0100.5100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AirlineDestinations

us-gaap:AtlanticDestination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value121517602103206614581676207319651389
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.216.218.518.115.216.018.818.215.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.216.218.518.115.216.018.818.215.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AtlanticDestination100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DomesticDestination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value507869047094708758756625676266895476
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax63.663.462.362.261.363.161.562.160.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax63.663.462.362.261.363.161.562.160.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DomesticDestination100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LatinAmericaDestination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value880959903943975857829838936
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.08.87.98.310.28.27.57.810.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.08.87.98.310.28.27.57.810.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:LatinAmericaDestination100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PacificDestination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value80612651280130612811333133912851231
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.111.611.211.513.412.712.211.913.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.111.611.211.513.412.712.211.913.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:PacificDestination100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

ual:PassengerAncillaryFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value476500645636571600572555
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.04.65.75.66.05.75.25.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.04.65.75.66.05.75.25.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:PassengerAncillaryFees100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CargoAndFreight



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value264316282295286334296314
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.32.92.52.63.03.22.72.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.32.92.52.63.03.22.72.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CargoAndFreight100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Passenger



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value70659933104811048687259556101209880
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.591.292.192.091.091.192.091.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.591.292.192.091.091.192.091.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Passenger100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductAndServiceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value650639617621578601587583
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.15.95.45.46.05.75.35.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.15.95.45.46.05.75.35.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, dei:LegalEntity

us-gaap:CargoAndFreight, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value264316282295286334296314
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.32.92.52.63.03.22.72.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.32.92.52.63.03.22.72.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CargoAndFreight ual:UnitedAirLinesInc100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Passenger, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value70659933104811048687259556101209880
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.591.292.192.091.091.192.091.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.591.292.192.091.091.192.091.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Passenger ual:UnitedAirLinesInc100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductAndServiceOther, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value650639617621578601587583
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.15.95.45.46.05.75.35.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.15.95.45.46.05.75.35.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther ual:UnitedAirLinesInc100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:TypeOfArrangement

us-gaap:ProductAndServiceOther, ual:ChaseAndOtherPartnerAgreements



Period End2020-03-312019-03-31
Value530473
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.64.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.64.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther ual:ChaseAndOtherPartnerAgreements100.0100.0

Costs And Expenses

us-gaap:CostsAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value8951100279907993090949839980096168756870987868601814280478289833675467955840784697867868893729423904590949720923192318985916797099364887392369001816848594727416543453911
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax112.292.187.187.194.893.889.189.296.992.188.885.996.688.983.688.792.188.081.685.491.493.388.791.2104.097.595.092.392.3103.0105.398.094.2103.290.891.899.690.191.698.298.097.3

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value8951100279906993090939838980096168755870887868600814280458289833675457955840684687867868793779423903790939720923092308985553456575391508352785133466848704720
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.099.9100.0100.0100.0100.060.458.357.657.357.157.057.1100.299.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax112.292.187.087.194.893.889.189.296.992.188.885.996.688.983.688.792.188.081.685.491.493.388.891.2103.997.595.092.392.3103.063.657.154.259.151.952.356.990.391.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc112.292.187.087.194.893.889.189.296.992.188.886.096.788.983.688.792.188.081.685.491.493.388.891.2103.997.495.092.392.3103.0109.5100.098.5106.590.192.299.889.991.4

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value-9728611473147249565212031161276729109213992781005162410606491081189914457416251191906-349235508770770-264-465200575-2714593580834-825354347688107
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-12.27.912.912.95.26.210.910.83.17.711.014.03.311.116.411.37.912.018.414.68.66.711.38.8-4.02.55.07.77.7-3.0-5.32.05.8-3.20.59.28.20.4-1.09.98.41.82.02.7

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-9728611474147249665312031161277730109214002781007162410606501081190014467416261186906-341238510773773-262-479-184-3085794378549443
Percentage of OperatingIncomeLoss100.0100.0100.1100.0100.2100.2100.0100.0100.4100.1100.0100.1100.0100.2100.0100.0100.2100.0100.1100.1100.0100.299.6100.097.7101.3100.4100.499.2103.0-0.514.6113.761.954.123.5102.6102.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-12.27.913.012.95.26.210.910.83.17.711.014.03.311.116.411.37.912.018.414.68.66.711.28.8-3.92.65.07.77.7-3.0-5.5-0.00.8-3.65.74.50.110.28.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-12.27.913.012.95.26.210.910.83.17.711.014.03.311.116.411.37.912.018.414.68.66.711.28.8-3.92.65.07.77.7-3.0-9.5-0.01.5-6.59.97.80.210.18.6

Interest Expense

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value-699-59914943-1-16648615-1-17-825-18-31-147-100-74-443-10654-895152-123-12323194-3827-64-29-115324-1035
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-8.8-0.50.10.10.10.4-0.0-1.50.50.10.2-0.0-0.2-0.10.00.1-0.2-0.3-1.4-1.0-0.9-4.8-1.00.5-1.00.50.5-1.2-1.20.30.20.0-0.40.3-0.6-0.3-0.00.30.10.6-0.20.9

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-698-599149430-16748615-2-16-825-18-29-147-101-74-478-9136-667150-117-117856-1-2518-35-3-5154
Percentage of OtherNonoperatingIncomeExpense99.9100.0100.0100.0100.0100.0-0.0100.6100.0100.0100.0200.094.1100.0100.0100.0100.093.5100.0101.0100.0107.985.866.774.2139.296.295.1369.631.6-25.065.866.754.710.3500.0100.0133.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-8.7-0.50.10.10.10.40.0-1.50.50.10.2-0.0-0.2-0.10.00.1-0.2-0.3-1.4-1.0-0.9-5.1-0.90.3-0.80.80.5-1.2-1.21.00.1-0.0-0.30.2-0.3-0.0-0.10.30.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-8.7-0.50.10.10.10.40.0-1.50.50.10.2-0.0-0.2-0.10.00.1-0.2-0.3-1.4-1.0-0.9-5.1-0.90.3-0.80.80.5-1.2-1.21.00.1-0.0-0.50.4-0.6-0.1-0.10.30.1

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-2114844134913543675561061857184600980127414588415109314949051606119751123920791-606112382471-426
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-26.57.811.911.93.85.39.68.02.06.39.912.71.79.815.29.96.010.015.612.15.90.28.77.7-7.01.23.74.7-4.9

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-21138441350135436855710628561856019801274146886151093149590616071197511-13929771-577133382486-364
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.1100.0100.3100.2100.199.9100.5100.2100.0100.0100.7100.2100.0100.0100.2100.1100.1100.0100.0-56.5101.097.595.2118.8100.0103.285.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-26.57.811.911.93.85.39.77.92.06.49.912.71.79.815.29.96.010.015.612.15.9-0.18.87.5-6.61.43.74.9-4.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-26.57.811.911.93.85.39.77.92.06.49.912.71.79.815.29.96.010.015.612.15.9-0.18.87.5-6.61.43.74.9-4.2

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value-1142-17-124-118-128-96-142-304-92-129-112-125-133-121-114-129-155-176-293-248-230-602-271-115-257-123-126-299-299-162-167-185-235-176-275-266-245-149-163-158-150-93
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-14.3-0.2-1.1-1.0-1.3-0.9-1.3-2.8-1.0-1.4-1.1-1.2-1.6-1.3-1.2-1.4-1.9-1.9-2.8-2.5-2.7-6.5-2.6-1.1-3.0-1.3-1.2-3.0-3.0-1.9-1.9-1.9-2.4-2.0-2.7-2.7-3.0-2.8-3.2-3.7-3.4-2.3

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-1141-17-124-118-128-96-141-305-92-129-112-126-132-121-114-129-155-175-293-249-230-639-257-135-236-105-128-287-287-102-87-119-156-113-162-156-168-150-164
Percentage of NonoperatingIncomeExpense99.9100.0100.0100.0100.0100.099.3100.3100.0100.0100.0100.899.2100.0100.0100.0100.099.4100.0100.4100.0106.194.8117.491.885.4101.696.063.052.164.366.464.258.958.668.6100.7100.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-14.3-0.2-1.1-1.0-1.3-0.9-1.3-2.8-1.0-1.4-1.1-1.3-1.6-1.3-1.2-1.4-1.9-1.9-2.8-2.5-2.7-6.9-2.4-1.3-2.7-1.1-1.3-2.9-2.9-1.2-1.0-1.2-1.6-1.3-1.6-1.6-2.0-2.8-3.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-14.3-0.2-1.1-1.0-1.3-0.9-1.3-2.8-1.0-1.4-1.1-1.3-1.6-1.3-1.2-1.4-1.9-1.9-2.8-2.5-2.7-6.9-2.4-1.3-2.7-1.1-1.3-2.9-2.9-1.2-1.7-2.1-2.8-2.4-2.8-2.8-3.6-2.8-3.2

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-06-302010-03-312009-09-302009-06-30
Value-410203325302759422517337203434564948754534318182-321043-6-423-7322-9-9911-2742-21-4-13
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.11.92.92.60.80.92.01.60.40.23.54.60.65.45.53.72.20.9-31.10.00.0-0.1-0.00.00.0-0.10.00.00.0-0.1-0.10.10.00.0-0.00.10.00.0-0.00.0-0.1-0.3

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302010-06-30
Value-40920232630275942251723843434564948954534318183-316942-5-423-21422-217-122-2
Percentage of IncomeTaxExpenseBenefit99.899.5100.3100.0100.0100.0100.099.4102.720.0100.0100.0100.0100.4100.0100.0100.0101.298.7100.066.783.3100.0100.0100.0300.0133.3100.022.2-11.177.8-100.0200.028.6100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.11.92.92.60.80.92.01.60.40.03.54.60.65.45.53.72.20.9-30.70.00.0-0.1-0.00.00.0-0.20.00.00.0-0.00.00.1-0.00.00.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-5.11.92.92.60.80.92.01.60.40.03.54.60.65.45.53.72.20.9-30.70.00.0-0.1-0.00.00.0-0.20.00.00.0-0.00.00.1-0.00.00.0-0.0

Income Taxes Paid Net

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value-1757427132710383027428496961803756578108936690163136792646941358610-1439723798-6371241455927927-398-1347186120-31136824156
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-22.03.911.79.13.17.17.76.52.04.06.68.11.14.09.16.74.510.245.513.77.1-15.56.87.7-7.313.34.49.39.3-4.6-15.51.91.2-3.63.60.21.9

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value-1757428132710383037438506961803926578109036690163136892546541359611-1475732777-6071255454942942-336-716-26-203-347231-80100
Percentage of ComprehensiveIncomeNetOfTax100.0100.2100.0100.0100.3100.1100.1100.0100.0104.5100.0100.0101.1100.0100.0100.0100.399.999.1100.1100.2102.5101.297.495.3101.199.8101.684.453.2-14.0-169.2111.662.8-333.364.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-22.03.911.79.13.27.17.76.52.04.16.68.11.14.09.16.74.510.245.213.77.1-15.86.97.5-7.013.54.49.49.4-3.9-8.2-0.3-2.0-4.02.3-0.81.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-22.03.911.79.13.27.17.76.52.04.16.68.11.14.09.16.74.510.245.213.77.1-15.86.97.5-7.013.44.49.49.4-3.9-14.2-0.5-3.7-7.33.9-1.42.1

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value-170464110241052292462836684147580637818963979655883138234816119350828924789-609140379469469-417-6206339-448-138653538-213-325387273-82-5728
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.04.47.66.31.66.16.48.21.14.49.76.33.89.146.712.05.90.38.77.6-7.01.53.74.74.7-4.8-7.10.13.4-5.2-1.56.45.5-2.6-3.87.25.3-1.9-1.30.7

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-1704642102410522934638376841475976378189739796558831482347761193509-8933769-580154378484484-362-567-127-71-423415281-160399281
Percentage of NetIncomeLoss100.0100.2100.0100.0100.3100.2100.1100.0100.0102.9100.0100.0101.0100.0100.0100.0100.3100.099.2100.0100.2-28.6101.097.595.2110.099.7103.286.891.5-2116.7-20.994.463.652.275.1103.1102.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.14.47.66.31.66.36.48.21.24.49.76.33.89.146.312.05.9-0.18.87.4-6.71.73.74.84.8-4.2-6.5-1.3-0.7-4.94.12.9-2.07.45.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-21.45.99.09.23.14.47.66.31.66.36.48.21.24.49.76.33.89.146.312.05.9-0.18.87.4-6.71.73.74.84.8-4.1-11.2-2.2-1.3-8.97.15.0-3.47.45.4

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-170464110241052292468833683145
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0101.399.699.998.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.04.57.66.31.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:RetainedEarnings, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-170464210241052293461834683
Percentage of NetIncomeLoss100.0100.2100.0100.0100.399.899.899.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.14.47.66.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-170464110241052292462836684147580637818963979655883138234816119350830923788-609139378468468-6206338-448651536-213387273
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.04.47.66.31.66.16.48.21.14.49.76.33.89.146.712.05.90.38.77.6-7.01.53.74.74.7-7.10.13.4-5.26.45.5-2.67.25.3

Net Income Loss Available To Common Stockholders Diluted

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value5305552611521995215050639447924483744691440184232642565423074144540140403274047640373408614186939367390913735338011384473718536812372603746836842376283790538694381993798839054396944055239598200552013418684
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value53049526055219352144506334478644832446854401342320425584225841395400914032840477403734086141870394093913438108385523893137806372863785338077374782080221605225632177918245188381916019628
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.999.999.9100.0100.0100.0100.0100.0100.1100.1102.0101.4101.3101.7101.3101.6101.6101.755.357.058.357.048.048.248.349.6
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.999.999.9100.0100.0100.0100.0100.0100.1100.1102.0101.4101.3101.7101.3101.6101.6101.755.357.058.357.048.048.248.349.6
Percentage of Assets ual:UnitedAirLinesInc100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value5305552611521995215050639447924483744691440184232642565423074144540140403274047640373408614186939367390913735338011384473718536812372603746836842376283790538694381993798839054396944055239598200552013418684
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value53049526055219352144506334478644832446854401342320425584225841395400914032840477403734086141870394093913438108385523893137806372863785338077374782080221605225632177918245188381916019628
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.999.999.9100.0100.0100.0100.0100.0100.1100.1102.0101.4101.3101.7101.3101.6101.6101.755.357.058.357.048.048.248.349.6
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.999.999.9100.0100.0100.0100.0100.0100.1100.1102.0101.4101.3101.7101.3101.6101.6101.755.357.058.357.048.048.248.349.6
Percentage of Assets ual:UnitedAirLinesInc100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-312007-12-31
Value94181153111301103209802999594698639833688068970885484498659843977847840896685554122300823963864334725792984172812179448118271635151018062312194219121727-2206-2756-2811-23212610
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.821.921.619.819.422.321.119.318.920.821.120.920.421.620.919.219.421.920.410.57.76.410.28.76.98.14.63.20.31.34.84.24.04.85.94.94.74.4-11.0-13.7-15.00.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value9380114921126310282976399579432860282988768891587998394860684357780783689638552416030462635419935772857322322461787840-3184-2470-2447-2248-1904-1719-1950-1977-2452-2336
Percentage of StockholdersEquity99.699.799.799.699.699.699.699.699.599.699.499.499.399.4100.099.999.9100.0100.0100.9101.3110.0108.7106.9110.8108.0130.0146.8893.6-662.0-135.2-149.7-148.9-105.4-74.4-100.4-114.587.2100.6
Percentage of Assets17.721.821.619.719.322.221.019.218.920.720.920.820.321.420.919.219.421.920.410.67.87.111.09.37.78.86.04.82.3-8.5-6.5-6.3-5.9-5.0-4.4-4.9-5.0-13.10.0
Percentage of Assets ual:UnitedAirLinesInc17.721.821.619.719.322.221.019.318.920.720.920.820.321.520.919.219.421.920.410.67.86.910.99.27.68.65.94.72.2-15.3-11.4-10.8-10.3-10.4-9.1-10.2-10.10.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-771-718-504-807-793-803-1089-1102-1114-1147-824-844-836-829-798-734-777-831-934-812-977-1079608-1046-4173873593141
Percentage of StockholdersEquity-8.2-6.2-4.5-7.8-8.1-8.0-11.5-12.8-13.4-13.0-9.2-9.5-9.9-9.6-9.5-9.4-9.9-9.3-10.9-19.7-32.5-45.020.4-217.5-23.122.4-1.2-4.05.4
Percentage of Assets-1.5-1.4-1.0-1.5-1.6-1.8-2.4-2.5-2.5-2.7-1.9-2.0-2.0-2.1-2.0-1.8-1.9-2.0-2.2-2.1-2.5-2.91.7-2.8-1.11.00.20.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value60966129611160966080612061056091607760986569794677217425714571147071313629192392
Percentage of StockholdersEquity64.753.254.159.162.061.264.570.572.969.275.988.6322.2248.81485.4393.9409.4-111.6-125.891.6
Percentage of Assets11.511.611.711.712.013.713.613.613.814.416.419.420.720.219.018.717.916.80.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value33333333333444333211
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.20.10.60.20.2-0.1-0.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value799197169075805069996668625254194736462134273457-3883-5015-5586-4863-5703-5956-530891
Percentage of StockholdersEquity84.884.380.378.071.466.766.062.756.852.539.638.6-162.1-168.1-1161.3-269.3-330.2211.9228.73.5
Percentage of Assets15.118.517.415.413.814.913.912.110.810.98.58.5-10.4-13.6-14.8-12.8-14.4-31.90.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-3901-3599-3384-3022-2487-1993-1753-1720-1314-769-511-1610-367-38-35-31-31-28-26-15
Percentage of StockholdersEquity-41.4-31.2-29.9-29.3-25.4-19.9-18.5-19.9-15.8-8.7-5.9-18.0-15.3-1.3-7.3-1.7-1.81.01.1-0.6
Percentage of Assets-7.4-6.8-6.5-5.8-4.9-4.4-3.9-3.8-3.0-1.8-1.3-3.9-1.0-0.1-0.1-0.1-0.1-0.10.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AccumulatedOtherComprehensiveIncome, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-771-718-504-807-793-803-1089-1102-1114-1147-829
Percentage of StockholdersEquity-8.2-6.2-4.5-7.8-8.1-8.0-11.5-12.8-13.4-13.0-9.6
Percentage of Assets-1.5-1.4-1.0-1.5-1.6-1.8-2.4-2.5-2.5-2.7-2.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value1000084598822841123317873573
Percentage of StockholdersEquity0.10.00.00.00.96.08.79.714.820.341.3
Percentage of Assets0.00.00.00.00.21.31.81.92.84.28.9
Percentage of Assets us-gaap:AdditionalPaidInCapital ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReceivablesFromStockholder, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-161-143-142-141-140-110-109-108-108-90-75
Percentage of StockholdersEquity-1.7-1.2-1.3-1.4-1.4-1.1-1.2-1.3-1.3-1.0-0.9
Percentage of Assets-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:ReceivablesFromStockholder ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value10302123531190911230106121031998569022833982015851
Percentage of StockholdersEquity109.4107.1105.4108.8108.3103.2104.1104.4100.093.167.6
Percentage of Assets19.423.522.821.521.023.022.020.218.919.414.6
Percentage of Assets us-gaap:RetainedEarnings ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value790581948533891076087194867188818287711378778248772473097970784472247828100978793950981389225961987888702938996219148100491077411708112611099711986123911314812045707069835105
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.915.616.317.115.016.119.319.918.816.818.519.518.618.219.819.417.919.224.122.324.321.824.325.023.623.625.225.724.826.728.430.329.528.930.731.232.430.435.334.727.3

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value78998188852789047602718886658875828271077870824377197303801378877267786910137883595518181926896548824869596089837937284929152980082705899654667106901
Percentage of AssetsCurrent99.999.999.999.999.999.999.999.999.999.999.999.999.999.9100.5100.5100.6100.5100.4100.5100.4100.5100.5100.4100.499.9102.3102.2102.484.584.983.773.453.654.654.257.3
Percentage of Assets14.915.616.317.115.016.019.319.918.816.818.519.518.618.219.919.518.019.324.222.424.421.924.425.123.723.625.826.325.422.624.125.321.615.516.816.917.4
Percentage of Assets ual:UnitedAirLinesInc14.915.616.317.115.016.019.319.918.816.818.519.518.618.219.919.518.019.324.222.424.421.524.024.823.323.325.425.825.040.842.443.438.032.334.735.035.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value3442276229593221184816942621288424041482187023712164217926302483179530063427279633522002311734243009322039354143353847705129608656066246698475198165806949384906351630422525256620391259
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.55.25.76.23.63.85.86.55.53.54.45.65.25.46.56.14.47.48.27.18.65.48.28.98.18.710.611.19.612.713.515.714.716.417.918.920.120.424.624.40.016.30.00.00.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value343627562953321518421688261528782398147618642365215821732624247717893000342127903346199631113418300332143928413735322766300540763338345840704107480646654932490030362033
Percentage of CashAndCashEquivalentsAtCarryingValue99.899.899.899.899.799.699.899.899.899.699.799.799.799.799.899.899.799.899.899.899.899.799.899.899.899.899.899.999.858.058.667.059.555.458.354.658.957.899.999.999.899.7
Percentage of Assets6.55.25.76.23.63.85.86.45.43.54.45.65.25.46.56.14.47.38.27.18.65.38.28.98.18.710.511.09.67.47.910.58.79.110.410.311.911.824.624.316.20.0
Percentage of Assets ual:UnitedAirLinesInc6.55.25.76.23.63.85.86.45.43.54.45.65.25.46.56.14.47.38.27.18.65.28.18.87.98.610.410.99.413.313.918.115.319.021.621.40.023.80.00.00.00.0

Short Term Investments

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value177921822167222322192256231421872071231624582278221522492226220221772190217221892256238223972372201519011801182118521773155116181667151613731060722611
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.44.14.24.34.45.05.24.94.75.55.85.45.35.65.55.45.45.45.25.65.86.46.36.25.45.24.84.95.04.74.14.24.44.03.52.71.81.5

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value17792182216722232219225623142187207123162458227822152249222622022177219021722189225623822397237220151901180118211852326346342338275186155
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.018.422.321.120.318.113.514.6
Percentage of Assets3.44.14.24.34.45.05.24.94.75.55.85.45.35.65.55.45.45.45.25.65.86.46.36.25.45.24.84.95.00.90.90.90.90.70.50.4
Percentage of Assets ual:UnitedAirLinesInc3.44.14.24.34.45.05.24.94.75.55.85.45.45.65.55.45.45.45.25.65.86.36.26.15.35.14.84.84.91.61.61.51.61.51.00.8

Accounts Receivable Net Current

Receivables Net Current

us-gaap:ReceivablesNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value79213641617176217891346175218401760134016031499142911761481145015811128151314711471114615591665160915031693173216791338186218181908135817131863235716131044971743
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.52.63.13.43.53.03.94.14.03.23.83.53.42.93.73.63.92.83.63.73.83.14.14.34.34.14.54.64.63.64.94.75.03.64.44.75.84.15.24.84.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7921364161717621789134617521840176013401603149914291176148114501581112815131471147111461559166516091503169317321679119416861568164176386511031004
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.089.290.586.286.056.250.559.262.2
Percentage of Assets1.52.63.13.43.53.03.94.14.03.23.83.53.42.93.73.63.92.83.63.73.83.14.14.34.34.14.54.64.63.24.44.14.32.02.22.82.5
Percentage of Assets ual:UnitedAirLinesInc1.52.63.13.43.53.03.94.14.03.23.83.53.52.93.73.63.92.83.63.73.83.04.04.34.34.04.54.54.55.77.86.97.54.24.65.85.1

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value822814725708780913973102811281051100912181016832791911912740819881826730838839845704700790845865837797783607595773658
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.51.41.41.52.02.22.32.62.52.42.92.52.12.02.32.31.82.02.22.12.02.22.22.31.91.92.12.32.32.22.12.01.61.51.91.7

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value822814725708780913973102811291051100812191017832840960961787867929874779887887893705685777841700633619524447413513366
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.1100.099.9100.1100.1100.0106.2105.4105.4106.4105.9105.4105.8106.7105.8105.7105.7100.197.998.499.580.975.677.766.973.669.466.455.6
Percentage of Assets1.51.51.41.41.52.02.22.32.62.52.42.92.52.12.12.42.41.92.12.42.22.12.32.32.41.91.82.12.31.91.71.61.41.21.11.30.9
Percentage of Assets ual:UnitedAirLinesInc1.51.51.41.41.52.02.22.32.62.52.42.92.52.12.12.42.41.92.12.42.22.02.32.32.41.91.82.02.23.42.92.72.42.42.22.71.9

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross



Period End2019-12-312019-09-302019-06-302019-03-312018-12-31
Value4470743485426124232540665
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0
Percentage of Assets85.083.381.783.690.8

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312019-09-302019-06-302019-03-312018-12-31
Value4470743485426124232540665
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0
Percentage of Assets85.083.381.783.690.8
Percentage of Assets ual:UnitedAirLinesInc85.083.381.783.690.8

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-31
Value1453714153136941373913266
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0
Percentage of Assets27.627.126.327.129.6

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312019-09-302019-06-302019-03-312018-12-31
Value1453714153136941373913266
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0
Percentage of Assets27.627.126.327.129.6
Percentage of Assets ual:UnitedAirLinesInc27.627.126.327.129.6

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value30170293322891828586283292730826946267392620825629250172424123318226452238822006215802117620701198621946718943188571838418047177661758417437172921681016577164441641916549166901683216945949096039840
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.356.255.556.563.260.960.360.761.960.259.158.558.156.255.354.552.850.652.650.852.149.849.049.449.047.746.947.346.044.342.843.043.242.442.041.542.847.347.752.7

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3017029332289182858628329273082694626739262082562925017242412331822645223882200621580211762070119863194671894318857183841804717766175841743789468894886089559070913292419475
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.051.752.953.454.555.255.255.455.9
Percentage of Assets57.356.255.556.563.260.960.360.761.960.259.158.558.156.255.354.552.850.652.650.852.149.849.049.449.047.746.947.323.823.522.923.423.923.423.323.9
Percentage of Assets ual:UnitedAirLinesInc57.456.255.556.563.360.960.360.861.960.259.258.658.256.255.354.552.850.652.550.851.149.148.448.648.446.946.246.543.041.239.341.149.748.548.248.3

Long Term Investments

Goodwill

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value29453009311431293144315933823399352135393558359236123632365436774112413641934220425742844330437244024436448745234561459746504681471247504772481548664917240024162455
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.65.76.06.06.27.17.57.68.08.48.48.58.79.09.19.110.210.110.010.710.911.511.411.411.812.112.012.112.412.212.312.112.312.512.212.112.012.412.012.013.1

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2945300931143129314431593382339935213539355835923612363236543677411241364193422042574284433043724402443644874523456122282241225522692283229823132343
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.048.548.248.248.248.148.248.047.7
Percentage of Assets5.65.76.06.06.27.17.57.68.08.48.48.58.79.09.19.110.210.110.010.710.911.511.411.411.812.112.012.112.45.95.95.85.96.05.95.85.9
Percentage of Assets ual:UnitedAirLinesInc5.65.76.06.06.27.17.57.68.08.48.48.58.79.19.19.110.210.110.010.710.911.211.211.211.611.911.911.912.210.710.410.010.412.512.212.111.9

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value84869489939794149380926988588864899290059059904294809513971210244111431145310596987397209748984399711001310063101051026310257102871032110409730770795816731715802828950
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.018.018.018.118.520.719.819.820.421.321.321.422.923.724.125.327.628.025.325.124.926.125.925.926.927.327.127.427.827.327.226.91.92.02.02.11.81.84.04.15.1

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value84869489939794149380926988598864899290059059899894359470967010202111001141210557987397201046010341104201059810544104791065610669336435593903602600570602622
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.599.599.599.699.699.699.699.6100.0100.0107.3105.1104.5105.8104.8103.7103.8104.032.734.537.582.577.971.773.887.0
Percentage of Assets16.018.018.018.118.520.719.819.820.421.321.321.322.823.624.025.227.527.925.225.124.928.027.227.128.528.628.128.429.08.99.410.11.61.61.51.51.6
Percentage of Assets ual:UnitedAirLinesInc16.018.018.018.118.520.719.819.820.421.321.321.322.823.624.025.227.527.925.225.124.827.426.826.828.028.327.728.028.516.216.517.32.83.33.03.13.2

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1608714938156911607815335132121368414092141831267613087135961266212286132531398213380124141348813810139691250812864133341309112107126041292712892128181305713312124861139411898127621387412645825685736473
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.328.430.130.830.329.530.531.532.229.930.732.130.630.632.934.533.130.432.235.135.733.533.834.735.232.933.834.535.034.134.434.432.730.030.532.234.231.941.242.634.6

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value160911494315696160821534013217136891409614189126811309113602126671229013257139871338412417134921381413974125131286913430131881222512712130441304210626108361109698206927701175067892
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.7100.7101.0100.9100.9101.282.983.083.478.660.858.958.862.4
Percentage of Assets30.328.430.130.830.329.530.531.532.230.030.832.230.630.632.934.633.230.432.235.135.733.533.934.935.533.234.134.835.428.228.628.725.718.218.018.919.9
Percentage of Assets ual:UnitedAirLinesInc30.328.430.130.830.329.530.531.532.230.030.832.230.630.732.934.633.230.432.235.135.732.833.434.534.932.833.634.334.851.150.249.245.138.037.239.240.2

Long Term Debt Current

us-gaap:LongTermDebtCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value405514071243125512011230910887165515651516143671684996912721295122413121047170013131340116811781368957909107918121704134910131186120113892319241114491415545
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.62.72.42.42.42.72.02.03.83.73.63.41.72.12.43.13.23.03.12.74.33.53.53.03.23.72.62.42.94.84.53.52.73.13.13.55.76.17.27.02.9

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value405514071243125512011230910887165515651516143671684996912721295122413121047170013131340116811781368957909107910909786436156154766351546
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.060.257.447.760.751.939.645.764.1
Percentage of Assets7.62.72.42.42.42.72.02.03.83.73.63.41.72.12.43.13.23.03.12.74.33.53.53.03.23.72.62.42.92.92.61.71.61.61.21.63.9
Percentage of Assets ual:UnitedAirLinesInc7.62.72.42.42.42.72.02.03.83.73.63.41.72.12.43.13.23.03.12.74.33.43.53.03.13.72.52.42.95.24.52.82.83.42.53.37.9

Accounts Payable Current

us-gaap:AccountsPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value24362703284830332707236325812703239921962231222521352139213822402065186920822322207418822085244123322087212622982293231221882165222019981808199918971805889926803
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.65.15.55.85.35.35.86.05.55.25.25.35.25.35.35.55.14.65.05.95.35.05.56.36.35.75.76.16.26.15.85.65.85.34.65.04.74.64.44.64.3

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value243627032848303327072363258127032399219622312230214121442143224520691874208623272079188620892446233620922131230222961518142614061385110910221161907
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.2100.3100.2100.2100.2100.2100.3100.2100.2100.2100.2100.2100.2100.2100.2100.2100.2100.165.765.264.962.455.556.558.150.2
Percentage of Assets4.65.15.55.85.35.35.86.05.55.25.25.35.25.35.35.55.14.65.05.95.35.05.56.46.35.75.76.16.24.03.83.63.62.92.62.92.3
Percentage of Assets ual:UnitedAirLinesInc4.65.15.55.85.35.35.86.05.55.25.25.35.25.35.35.55.14.65.05.95.34.95.46.36.25.65.66.06.17.36.66.26.46.15.46.14.6

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value538566574604553
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0
Percentage of Assets1.01.11.11.21.2

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value542571579608558
Percentage of OtherLiabilitiesCurrent100.7100.9100.9100.7100.9
Percentage of Assets1.01.11.11.21.2
Percentage of Assets ual:UnitedAirLinesInc1.01.11.11.21.2

Liabilities Noncurrent

Long Term Debt

dei:LegalEntity

us-gaap:LongTermDebt

ual:UalAndUnited



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value174561473314324143791412413636132881351313985134311301612266120311089111042
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets32.928.027.427.627.930.429.630.231.831.730.629.029.027.127.0
Percentage of Assets ual:UalAndUnited0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtInstrument

ual:FloatingRateDebt



Period End2020-03-312019-09-302019-06-302019-03-31
Value6000340034003400
Percentage of LongTermDebt34.423.723.624.1
Percentage of Assets11.36.56.56.7
Percentage of Assets ual:FloatingRateDebt0.00.00.00.0

ual:PassThroughCertificates



Period End2019-12-31
Value9600
Percentage of LongTermDebt65.2
Percentage of Assets18.2
Percentage of Assets ual:PassThroughCertificates0.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value1725314552141431419313935134451312813347138211326812850121041189410767105811054710767108971122210985116141143411328115221127611539111611112312252
Percentage of LongTermDebt98.898.898.798.798.798.698.898.898.898.898.798.798.998.90.00.00.098.70.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets32.527.727.127.227.530.029.329.931.431.330.228.628.726.826.226.126.726.726.827.929.730.629.830.030.331.330.029.732.6
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value131981314512900129381273412215122181246012166117031133410668111789918961292759472967399109938991410121998810354100981017110204102141018210440959210128104081049610873111011111511434602562816378
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets24.925.024.724.825.127.327.227.927.627.626.625.227.024.723.822.923.523.723.725.225.427.126.326.927.227.627.427.327.627.725.326.227.227.627.828.027.428.930.031.234.1

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1319813145129001293812734122151221812460121661170311334106681117899189612927594729673991099389914101209892102559996100201005110007978342854191488849875130535054685480
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.099.099.098.598.598.096.141.043.748.347.948.949.249.347.9
Percentage of Assets24.925.024.724.825.127.327.227.927.627.626.625.227.024.723.822.923.523.723.725.225.427.126.026.726.927.227.026.726.611.411.112.613.113.513.713.813.8
Percentage of Assets ual:UnitedAirLinesInc24.925.024.724.825.127.327.327.927.627.726.625.227.024.723.822.923.523.723.725.225.326.625.726.326.426.926.626.326.120.619.421.722.928.128.428.527.9

Deferred Tax Liabilities Noncurrent

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value789129516021581
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0
Percentage of Assets1.52.93.83.9
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.00.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value1446157619211892
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent183.3121.7119.9119.7
Percentage of Assets2.73.54.54.7
Percentage of Assets us-gaap:PensionPlansDefinedBenefit0.00.00.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value117910249819807387823683508461831481458206824583208455827186958956908191541093411640117571371137112811283129813921328136613561364135113951322131426152704109110741094
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.21.91.91.914.618.418.618.918.919.219.319.520.121.120.521.522.222.221.927.829.831.53.63.63.43.53.53.73.63.63.63.53.53.73.43.36.46.85.45.35.9

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value11791025980980741582638377848883418172825082458320845582728695895690819154109341164012269166716341634155214831591153710351044959980983952956972
Percentage of OtherLiabilitiesNoncurrent100.0100.199.9100.0100.4100.3100.3100.3100.3100.3100.5100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0104.4121.6119.2127.6121.0114.3114.3115.775.877.070.372.570.572.072.835.9
Percentage of Assets2.21.91.91.914.618.418.719.018.919.319.419.520.121.120.521.522.222.221.927.829.832.84.44.34.44.24.04.24.22.82.82.52.62.62.42.42.5
Percentage of Assets ual:UnitedAirLinesInc2.21.91.91.914.618.418.719.019.019.319.419.520.121.120.521.522.222.221.927.729.732.24.34.24.34.23.94.24.15.04.84.34.55.45.15.05.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-312007-12-31
Value94181153111301103209802999594698639833688068970885484498659843977847840896685554122300823963864334725792984172812179448118271635151018062312194219121727-2206-2756-2811-23212610
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.821.921.619.819.422.321.119.318.920.821.120.920.421.620.919.219.421.920.410.57.76.410.28.76.98.14.63.20.31.34.84.24.04.85.94.94.74.4-11.0-13.7-15.00.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value9380114921126310282976399579432860282988768891587998394860684357780783689638552416030462635419935772857322322461787840-3184-2470-2447-2248-1904-1719-1950-1977-2452-2336
Percentage of StockholdersEquity99.699.799.799.699.699.699.699.699.599.699.499.499.399.4100.099.999.9100.0100.0100.9101.3110.0108.7106.9110.8108.0130.0146.8893.6-662.0-135.2-149.7-148.9-105.4-74.4-100.4-114.587.2100.6
Percentage of Assets17.721.821.619.719.322.221.019.218.920.720.920.820.321.420.919.219.421.920.410.67.87.111.09.37.78.86.04.82.3-8.5-6.5-6.3-5.9-5.0-4.4-4.9-5.0-13.10.0
Percentage of Assets ual:UnitedAirLinesInc17.721.821.619.719.322.221.019.318.920.720.920.820.321.520.919.219.421.920.410.67.86.910.99.27.68.65.94.72.2-15.3-11.4-10.8-10.3-10.4-9.1-10.2-10.10.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-771-718-504-807-793-803-1089-1102-1114-1147-824-844-836-829-798-734-777-831-934-812-977-1079608-1046-4173873593141
Percentage of StockholdersEquity-8.2-6.2-4.5-7.8-8.1-8.0-11.5-12.8-13.4-13.0-9.2-9.5-9.9-9.6-9.5-9.4-9.9-9.3-10.9-19.7-32.5-45.020.4-217.5-23.122.4-1.2-4.05.4
Percentage of Assets-1.5-1.4-1.0-1.5-1.6-1.8-2.4-2.5-2.5-2.7-1.9-2.0-2.0-2.1-2.0-1.8-1.9-2.0-2.2-2.1-2.5-2.91.7-2.8-1.11.00.20.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value60966129611160966080612061056091607760986569794677217425714571147071313629192392
Percentage of StockholdersEquity64.753.254.159.162.061.264.570.572.969.275.988.6322.2248.81485.4393.9409.4-111.6-125.891.6
Percentage of Assets11.511.611.711.712.013.713.613.613.814.416.419.420.720.219.018.717.916.80.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value33333333333444333211
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.20.10.60.20.2-0.1-0.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value799197169075805069996668625254194736462134273457-3883-5015-5586-4863-5703-5956-530891
Percentage of StockholdersEquity84.884.380.378.071.466.766.062.756.852.539.638.6-162.1-168.1-1161.3-269.3-330.2211.9228.73.5
Percentage of Assets15.118.517.415.413.814.913.912.110.810.98.58.5-10.4-13.6-14.8-12.8-14.4-31.90.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-3901-3599-3384-3022-2487-1993-1753-1720-1314-769-511-1610-367-38-35-31-31-28-26-15
Percentage of StockholdersEquity-41.4-31.2-29.9-29.3-25.4-19.9-18.5-19.9-15.8-8.7-5.9-18.0-15.3-1.3-7.3-1.7-1.81.01.1-0.6
Percentage of Assets-7.4-6.8-6.5-5.8-4.9-4.4-3.9-3.8-3.0-1.8-1.3-3.9-1.0-0.1-0.1-0.1-0.1-0.10.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AccumulatedOtherComprehensiveIncome, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-771-718-504-807-793-803-1089-1102-1114-1147-829
Percentage of StockholdersEquity-8.2-6.2-4.5-7.8-8.1-8.0-11.5-12.8-13.4-13.0-9.6
Percentage of Assets-1.5-1.4-1.0-1.5-1.6-1.8-2.4-2.5-2.5-2.7-2.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value1000084598822841123317873573
Percentage of StockholdersEquity0.10.00.00.00.96.08.79.714.820.341.3
Percentage of Assets0.00.00.00.00.21.31.81.92.84.28.9
Percentage of Assets us-gaap:AdditionalPaidInCapital ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReceivablesFromStockholder, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-161-143-142-141-140-110-109-108-108-90-75
Percentage of StockholdersEquity-1.7-1.2-1.3-1.4-1.4-1.1-1.2-1.3-1.3-1.0-0.9
Percentage of Assets-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:ReceivablesFromStockholder ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value10302123531190911230106121031998569022833982015851
Percentage of StockholdersEquity109.4107.1105.4108.8108.3103.2104.1104.4100.093.167.6
Percentage of Assets19.423.522.821.521.023.022.020.218.919.414.6
Percentage of Assets us-gaap:RetainedEarnings ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value33333333333333444444444444443333333333222
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value7991971690758050699966686203536746844621499143543536342753234358377034572634-2182-3375-3883-3911-4835-5624-5015-5155-5534-6003-5586-4965-4972-5311-4863-4725-5378-5916-5703-5377-5765-5956
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.118.517.415.413.814.913.812.010.610.911.710.38.58.513.210.89.38.56.3-5.5-8.6-10.4-10.3-12.6-15.1-13.6-13.8-14.8-16.3-14.8-13.1-12.8-13.9-12.8-12.1-13.5-14.6-14.4-26.8-28.6-31.9

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1030212353119091123010612102729807897182878218750468666048593755404575398736732850-1926-3119-3628-3619-4552-5322-4743-4897-5275-5758-6396-5829-5702-5631-5208-4953-5368-5489
Percentage of RetainedEarningsAccumulatedDeficit128.9127.1131.2139.5151.6154.0158.1167.2176.9177.8150.4157.7171.0173.2104.1105.0105.8106.2108.288.392.493.492.594.194.694.695.095.395.9114.5117.4114.7106.0107.1104.899.896.2
Percentage of Assets19.423.522.821.521.022.921.920.118.819.417.616.214.614.813.711.39.99.06.8-4.9-8.0-9.7-9.5-11.8-14.3-12.9-13.1-14.1-15.6-17.0-15.4-14.7-14.7-13.7-12.7-13.5-13.9
Percentage of Assets ual:UnitedAirLinesInc19.423.522.821.521.022.921.920.118.819.417.616.214.614.813.711.39.99.06.8-4.9-8.0-9.5-9.4-11.7-14.1-12.7-12.9-13.9-15.4-30.7-27.0-25.3-25.9-28.5-26.3-28.0-28.0

Treasury Stock Value

us-gaap:TreasuryStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value3901359933843022248719931753172013147691791123681651140643809311316101090826576367237474738383838353232323131313131313028
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.46.86.55.84.94.43.93.83.01.84.22.92.01.310.19.47.73.92.62.11.51.00.60.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.10.1

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-272012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value-771-718-504-807-793-803-1089-1102-1114-1147-824-844-836-829-798-734-777-831-934-812-977-1079388589580608-493-569-1027-1027-1046-319-499-280-417-4524275638748-1093593
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.5-1.4-1.0-1.5-1.6-1.8-2.4-2.5-2.5-2.7-1.9-2.0-2.0-2.1-2.0-1.8-1.9-2.0-2.2-2.1-2.5-2.91.01.51.61.7-1.3-1.5-2.80.0-2.8-0.8-1.3-0.7-1.1-0.10.61.91.00.2-0.50.20.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value-771-718-504-807-793-803-1089-1102-1114-1147-824-844-89-829-798-734-777-831-933-811-977-1079388589581608-493-569-1027-232-83-184-52-128-196-109135
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.010.6100.0100.0100.0100.0100.099.999.9100.0100.0100.0100.0100.2100.0100.0100.0100.022.226.036.918.630.7435.6-4.123.5100.0
Percentage of Assets-1.5-1.4-1.0-1.5-1.6-1.8-2.4-2.5-2.5-2.7-1.9-2.0-0.2-2.1-2.0-1.8-1.9-2.0-2.2-2.1-2.5-2.91.01.51.61.7-1.3-1.5-2.8-0.6-0.2-0.5-0.1-0.3-0.5-0.00.20.2
Percentage of Assets ual:UnitedAirLinesInc-1.5-1.4-1.0-1.5-1.6-1.8-2.4-2.5-2.5-2.7-1.9-2.0-0.2-2.1-2.0-1.8-1.9-2.0-2.2-2.1-2.5-2.81.01.51.51.6-1.3-1.5-2.7-1.1-0.4-0.8-0.2-0.7-1.0-0.10.50.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value6311811103271019151084905246617097895771464694-334237114839390-2381241005482
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.810.89.723.820.010.38.222.918.98.35.814.28.0-3.62.311.54.51.0-2.41.412.311.4

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value4511811102271018861083905246616927895761463686-3332361149389139-489168786
Percentage of NetCashProvidedByUsedInOperatingActivities71.4100.099.9100.098.599.9100.0100.099.0100.099.899.998.899.799.6100.199.0154.4205.5135.578.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.610.89.723.819.710.38.222.918.78.35.814.27.9-3.62.311.54.51.6-4.92.09.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc0.610.89.723.819.710.38.222.918.78.35.814.27.9-3.62.311.54.52.7-8.63.516.8

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value-1572-1329-795-856-1580-1852-886-1022-695-849-1276-905-427-723-466-402-431-1152-230-362-320-76
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-19.7-12.2-7.0-7.5-16.5-17.7-8.1-9.5-7.7-9.0-12.9-8.8-4.9-7.8-4.6-4.0-4.9-13.2-2.3-4.2-3.9-1.8

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value-1572-1329-795-856-1580-1852-886-1022-695-849-1276-905-427-723-466-403-431-235-191-121-135
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.2100.020.483.033.442.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-19.7-12.2-7.0-7.5-16.5-17.7-8.1-9.5-7.7-9.0-12.9-8.8-4.9-7.8-4.6-4.0-4.9-2.7-1.9-1.4-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-19.7-12.2-7.0-7.5-16.5-17.7-8.1-9.5-7.7-9.0-12.9-8.8-4.9-7.7-4.6-4.0-4.9-4.6-3.4-2.5-2.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value2189-47-571-479-183-159-284-963-95-328177-144-47834221-141-1194703-489-402-58968
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.4-0.4-5.0-4.2-1.9-1.5-2.6-8.9-1.1-3.51.8-1.4-5.53.70.2-1.4-13.78.1-4.9-4.7-7.21.6

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value2207-47-570-479-154-158-284-963-78-328178-143-47034221-141-1191-143-391-167-510
Percentage of NetCashProvidedByUsedInFinancingActivities100.8100.099.8100.084.299.4100.0100.082.1100.0100.699.398.3100.0100.0100.099.7-20.380.041.586.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.7-0.4-5.0-4.2-1.6-1.5-2.6-8.9-0.9-3.51.8-1.4-5.43.70.2-1.4-13.7-1.6-3.9-1.9-6.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc27.7-0.4-5.0-4.2-1.6-1.5-2.6-8.9-0.9-3.51.8-1.4-5.43.70.2-1.4-13.7-2.8-6.9-3.5-10.9

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value6311811103271019151084905246617097895771464694-334237114839390-2381241005482
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.810.89.723.820.010.38.222.918.98.35.814.28.0-3.62.311.54.51.0-2.41.412.311.4

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value4511811102271018861083905246616927895761463686-3332361149389139-489168786
Percentage of NetCashProvidedByUsedInOperatingActivities71.4100.099.9100.098.599.9100.0100.099.0100.099.899.998.899.799.6100.199.0154.4205.5135.578.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.610.89.723.819.710.38.222.918.78.35.814.27.9-3.62.311.54.51.6-4.92.09.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc0.610.89.723.819.710.38.222.918.78.35.814.27.9-3.62.311.54.52.7-8.63.516.8

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value-170464110241052292462836684147580637818963979655883138234816119350828924789-609140379469469-417-6206339-448-138653538-213-325387273-82-5728
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.04.47.66.31.66.16.48.21.14.49.76.33.89.146.712.05.90.38.77.6-7.01.53.74.74.7-4.8-7.10.13.4-5.2-1.56.45.5-2.6-3.87.25.3-1.9-1.30.7

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-1704642102410522934638376841475976378189739796558831482347761193509-8933769-580154378484484-362-567-127-71-423415281-160399281
Percentage of NetIncomeLoss100.0100.2100.0100.0100.3100.2100.1100.0100.0102.9100.0100.0101.0100.0100.0100.0100.3100.099.2100.0100.2-28.6101.097.595.2110.099.7103.286.891.5-2116.7-20.994.463.652.275.1103.1102.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.14.47.66.31.66.36.48.21.24.49.76.33.89.146.312.05.9-0.18.87.4-6.71.73.74.84.8-4.2-6.5-1.3-0.7-4.94.12.9-2.07.45.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-21.45.99.09.23.14.47.66.31.66.36.48.21.24.49.76.33.89.146.312.05.9-0.18.87.4-6.71.73.74.84.8-4.1-11.2-2.2-1.3-8.97.15.0-3.47.45.4

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-170464110241052292468833683145
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0101.399.699.998.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.04.57.66.31.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:RetainedEarnings, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-170464210241052293461834683
Percentage of NetIncomeLoss100.0100.2100.0100.0100.399.899.899.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-21.45.99.09.23.14.47.66.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.0

Increase Decrease In Other Operating Capital Net

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value-1572-1329-795-856-1580-1852-886-1022-695-849-1276-905-427-723-466-402-431-1152-230-362-320-76
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-19.7-12.2-7.0-7.5-16.5-17.7-8.1-9.5-7.7-9.0-12.9-8.8-4.9-7.8-4.6-4.0-4.9-13.2-2.3-4.2-3.9-1.8

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value-1572-1329-795-856-1580-1852-886-1022-695-849-1276-905-427-723-466-403-431-235-191-121-135
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.2100.020.483.033.442.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-19.7-12.2-7.0-7.5-16.5-17.7-8.1-9.5-7.7-9.0-12.9-8.8-4.9-7.8-4.6-4.0-4.9-2.7-1.9-1.4-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc-19.7-12.2-7.0-7.5-16.5-17.7-8.1-9.5-7.7-9.0-12.9-8.8-4.9-7.7-4.6-4.0-4.9-4.6-3.4-2.5-2.9

Payments To Acquire Investments

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value2189-47-571-479-183-159-284-963-95-328177-144-47834221-141-1194703-489-402-58968
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.4-0.4-5.0-4.2-1.9-1.5-2.6-8.9-1.1-3.51.8-1.4-5.53.70.2-1.4-13.78.1-4.9-4.7-7.21.6

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value2207-47-570-479-154-158-284-963-78-328178-143-47034221-141-1191-143-391-167-510
Percentage of NetCashProvidedByUsedInFinancingActivities100.8100.099.8100.084.299.4100.0100.082.1100.0100.699.398.3100.0100.0100.099.7-20.380.041.586.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.7-0.4-5.0-4.2-1.6-1.5-2.6-8.9-0.9-3.51.8-1.4-5.43.70.2-1.4-13.7-1.6-3.9-1.9-6.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ual:UnitedAirLinesInc27.7-0.4-5.0-4.2-1.6-1.5-2.6-8.9-0.9-3.51.8-1.4-5.43.70.2-1.4-13.7-2.8-6.9-3.5-10.9

Proceeds From Issuance Of Long Term Debt

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value23551425322325020822511051891791972103153044582262276502091023296502108929961322022849612412344624795281204
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value2355142532232502082251105189179197210315304458226227650209102329650210892996132202284961241104365147397
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.044.479.030.775.2
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value35321436954951322541440529553579454258172260790139252326525019592
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value23551425322325020822511051891791972103153044582262276502091023296502108929961322022849612412344624795281204
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value2355142532232502082251105189179197210315304458226227650209102329650210892996132202284961241104365147397
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.044.479.030.775.2
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations ual:UnitedAirLinesInc0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Debt Instrument Interest Rate Stated Percentage

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value0.1940.2410.2230.2040.2120.2020.2030.350.3580.3380.360.3690.366
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

ual:PerformanceBasedRestrictedStockUnitsRSUs



Period End2020-03-312019-12-312019-09-30
Value300000.00.00.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.00.00.0

ual:TimeVestedRestrictedStockUnitsRSUs



Period End2020-03-312019-12-312019-09-30
Value400000.0100000.00.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod133.30.00.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-312019-12-312019-09-302017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-03-312014-02-282013-02-282012-02-29
Value00000010000000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod233.30.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities



Period End2019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value173681422548414930579259406223
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value17638422524805489731833354
Percentage of DeferredTaxLiabilities101.6103.4112.099.399.355.056.5

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4060286430095942746938413943479249525229
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value403328362982589974273805391028072995
Percentage of DeferredTaxAssetsNet99.399.099.199.399.499.199.258.660.5

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value53392174249141924321620
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312015-09-302014-12-312013-12-312012-12-312011-12-312010-12-31
Value5859636848320047513806460341374171
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value58596368484721377630682614
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.099.499.266.763.2

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value485347584937490850655262
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value485347584937490850655262
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value35482868306333261951179927262991251015911979250123033212
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value35422862305733201945179327202985250415851973249522973206
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents99.899.899.899.899.799.799.899.899.899.699.799.899.799.8

dei:LegalEntity

ual:CapitalContributionsToParent

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value34221536353652823934407569
Percentage of CapitalContributionsToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AdditionalPaidInCapital, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value12171810252823934407
Percentage of CapitalContributionsToParent3.57.95.019.0100.0100.0100.0100.0

us-gaap:RetainedEarnings, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-30
Value330198345434
Percentage of CapitalContributionsToParent96.592.195.081.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

ual:DebtInstrumentVariableRateFloor

ual:SparePartsFacility, us-gaap:SecuredDebt



Period End2020-03-20
Value0.01
Percentage of DebtInstrumentVariableRateFloor100.0

ual:UsedAircraftFacility, us-gaap:SecuredDebt



Period End2020-03-09
Value0.01
Percentage of DebtInstrumentVariableRateFloor0.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

ual:SpareEnginesCreditAgreement, us-gaap:SecuredDebt, us-gaap:SubsequentEvent



Period End2020-04-07
Value0.01
Percentage of DebtInstrumentVariableRateFloor0.0

us-gaap:TitleOfIndividual

ual:ExecutiveAndDirectorCompensationVoluntaryDecreaseInSalaryPercent

srt:ChiefExecutiveOfficer



Period End2020-03-10
Value1.0
Percentage of ExecutiveAndDirectorCompensationVoluntaryDecreaseInSalaryPercent100.0

srt:Director



Period End2020-03-10
Value1.0
Percentage of ExecutiveAndDirectorCompensationVoluntaryDecreaseInSalaryPercent100.0

srt:Officer



Period End2020-03-10
Value0.5
Percentage of ExecutiveAndDirectorCompensationVoluntaryDecreaseInSalaryPercent50.0

ual:FinanceLeaseConversionFromOperatingLeaseRecordedPropertyPlantAndEquipment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value43900365200
Percentage of FinanceLeaseConversionFromOperatingLeaseRecordedPropertyPlantAndEquipment100.00.00.0100.0100.00.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value43900365200
Percentage of FinanceLeaseConversionFromOperatingLeaseRecordedPropertyPlantAndEquipment100.00.00.0100.0100.00.00.0

us-gaap:ProductOrService

ual:FrequentFlyerMileageMilesAwardedInPeriod

ual:FrequentFlyerProgram



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value559670662682607625616607
Percentage of FrequentFlyerMileageMilesAwardedInPeriod100.0100.0100.0100.0100.0100.0100.0100.0

ual:GainLossOnFinancialInstrumentsNonOperating



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-319812134175629-13545
Percentage of GainLossOnFinancialInstrumentsNonOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0

ual:GainLossOnSaleOfOtherAssetsAndOtherMiscellaneousCharges



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-13-26-25-4-423-7-3-6-12-3-14-19-18-6-8
Percentage of GainLossOnSaleOfOtherAssetsAndOtherMiscellaneousCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ual:IncomeTaxExpenseBenefitSpecialCharges



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-14-11-2-80-553-29-9-11-18-16-1812-16-153-72
Percentage of IncomeTaxExpenseBenefitSpecialCharges100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

ual:NonTravelMilesRedemptionFrequentFlyerDeferredRevenue

ual:FrequentFlyerProgram



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2534343336473836
Percentage of NonTravelMilesRedemptionFrequentFlyerDeferredRevenue100.0100.0100.0100.0100.0100.0100.0100.0

ual:OtherComprehensiveIncomeInvestmentsAndOtherNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-30
Value-120-133-8103-1117-1210-1-2-6-1014-21-55-5
Percentage of OtherComprehensiveIncomeInvestmentsAndOtherNetOfTax100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-120-133-8103-1117-1210-1-3-6-914-21-615-5
Percentage of OtherComprehensiveIncomeInvestmentsAndOtherNetOfTax100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0150.0100.090.0100.0100.0100.0120.00.0100.0100.0

dei:LegalEntity

ual:PaymentsOfDividendsToParentCompany

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value35321436954951322541440529553579454258172260790139252426425019592
Percentage of PaymentsOfDividendsToParentCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

ual:ProceedsFromIssuanceOfLongTermDebtExpected

us-gaap:SecuredDebt, us-gaap:SubsequentEvent



Period End2020-04-17
Value4500
Percentage of ProceedsFromIssuanceOfLongTermDebtExpected100.0

ual:SpecialChargesAndLossesOnFinancialInstrumentsNonOperatingBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1079496371245-12264-5
Percentage of SpecialChargesAndLossesOnFinancialInstrumentsNonOperatingBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

ual:SpecialItemsNetOfIncomeTaxBenefits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1065384291185-910031-17232283316129272126-300313718370
Percentage of SpecialItemsNetOfIncomeTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

ual:TravelMilesRedemptionFrequentFlyerDeferredRevenue

ual:FrequentFlyerProgram



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value322579607589438560580519
Percentage of TravelMilesRedemptionFrequentFlyerDeferredRevenue100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementScenario

ual:UnusualOrInfrequentItemsPercentOfCapacityCut

srt:ScenarioForecast



Period End2020-05-31
Value0.9
Percentage of UnusualOrInfrequentItemsPercentOfCapacityCut100.0

us-gaap:SubsequentEventType

us-gaap:SubsequentEvent



Period End2020-04-30
Value0.8
Percentage of UnusualOrInfrequentItemsPercentOfCapacityCut0.0

ual:VariableAndShortTermLeaseCost



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value638643661606625664669611
Percentage of VariableAndShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value221718171415161415
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value221718171415161415
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value221718171415161415
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AdditionalPaidInCapital, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2217181714151614
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AircraftMaintenanceMaterialsAndRepairs



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value434475490421408434455438440479451472454448451448402399424431397415435471458431472480480438452469432407447444439262245
Percentage of AircraftMaintenanceMaterialsAndRepairs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value434475490421408434455438440479451472454448451448402399424431397415435471458431472480480438301313282267299290292262245
Percentage of AircraftMaintenanceMaterialsAndRepairs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.066.666.765.365.666.965.366.5100.0100.0

us-gaap:AircraftRental



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value5067677381781091191271451451521791591681751781741851942012152222222242302312352352402462452512512552522538281
Percentage of AircraftRental100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value506767738178109119127145145152179159168175178174185194201215222222224230231235235240797878788280818281
Percentage of AircraftRental100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.032.131.831.131.132.231.732.0100.0100.0

us-gaap:AirlineCapacityPurchaseArrangements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value737725721715688638663681619580567549536552572551522565572583570597597591559582621628628588583628643616619615573417405
Percentage of AirlineCapacityPurchaseArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value737725721715688638663681619580567549536552572551522565572583570597597591559582621628628588355387386379407401382417405
Percentage of AirlineCapacityPurchaseArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.060.961.660.061.565.865.266.7100.0100.0

us-gaap:AllocatedShareBasedCompensationExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1830332116282927177103323342331018716174523143228321313271318111513141398
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetImpairmentCharges



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-06-302014-03-312013-12-312012-12-312012-03-312010-12-312010-09-302010-06-302010-03-31
Value5010206182321111123101500004124818112163213324653227317
Percentage of AssetImpairmentCharges100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value680-195-2631375152-927-265481919-388-522
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value680-195-2631375152-927-265481919-388-522
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

ual:AdvanceTicketSales



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2600041003900270010041003500
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11101215158888
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-35-31-29-29-29-33-32-32-33
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses-318.2-310.0-241.7-193.3-193.3-412.5-400.0-400.0-412.5

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-31-31-23-9-10-9-9-10-9
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value14335150132404719160160
Percentage of DefinedBenefitPlanContributionsByEmployer100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value0.00.00.01000000.00.01000000.01000000.00.00.01000000.00.01000000.01000000.00.01000000.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets0.00.00.0100.00.0100.0100.00.00.0100.00.0100.0100.00.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value91737373727373737361616160545454
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets0.00.00.07300.00.07300.07300.00.00.06100.00.06100.00.05400.00.05400.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value781014151516151516161717202222
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value56565657575554545455555555495050
Percentage of DefinedBenefitPlanInterestCost800.0700.0560.0407.1380.0366.7337.5360.0360.0343.8343.8323.5323.5245.0227.3227.3

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-33-30-23-8-801012221-46-3413
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value57606062607370707176777676434644
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-172.7-200.0-260.9-775.0-750.00.07000.00.07100.03800.03850.03800.07600.0-93.5-135.3338.5

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-09-302017-06-302016-09-302016-06-30
Value-3-2-3000-3-1-2-1
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.00.00.00.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value2323233333442546
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value54464646465757575749484949282927
Percentage of DefinedBenefitPlanServiceCost2700.01533.32300.01533.32300.01900.01900.01900.01900.01633.31200.01225.02450.0560.0725.0450.0

us-gaap:DepreciationAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value615606575560547578564557541539556536518504503491479476469445429431422417409421435425425408385379378380384385388224215221220222
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value615606575560547578564557541539556536518504503491479476469445429431422417409421435425425408235232232231228229227232223
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.061.061.261.460.859.459.558.5103.6103.7

us-gaap:EarningsPerShareBasicAndDiluted



Period End2020-03-312019-03-312018-03-312017-03-312014-03-312013-03-312012-03-31
Value-6.861.090.520.32-1.66-1.26-1.36
Percentage of EarningsPerShareBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquitySecuritiesFvNiGainLoss

ual:Azul



Period End2019-12-312019-09-302019-06-302018-09-302018-06-30
Value63253829-135
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

ual:Azul



Period End2020-03-312019-03-31
Value-29314
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0

us-gaap:FinanceLeaseInterestExpense



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1273227181745
Percentage of FinanceLeaseInterestExpense100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseInterestPaymentOnLiability



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7162324232145
Percentage of FinanceLeaseInterestPaymentOnLiability100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeasePrincipalPayments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value184642432022221718
Percentage of FinanceLeasePrincipalPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value184642432022221718
Percentage of FinanceLeasePrincipalPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1715181818171723
Percentage of FinanceLeaseRightOfUseAssetAmortization100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FuelCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value17262249229623852023238025722390196518751809166915601555160314371218161819342106186425303127310129172965326230683068305030953406340832293371322726721242119812071064665
Percentage of FuelCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value172622492296238520232380257223901965187518091669156015551603143712181618193421061864253031273101291729653262306830683050174519141929184219491833151215341486
Percentage of FuelCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.056.456.256.657.057.856.856.6123.5124.0

us-gaap:GainLossOnDispositionOfAssets1



Period End2019-12-312019-09-30
Value-68
Percentage of GainLossOnDispositionOfAssets1100.0100.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill

ual:AirlineRoutesHongKong



Period End2019-12-312018-12-31
Value90206
Percentage of ImpairmentOfIntangibleAssetsExcludingGoodwill100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value00101010100000101010101
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.0

us-gaap:InterestCostsCapitalizedAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value212022212219181419202021232420141411131312121313141412121211119988108
Percentage of InterestCostsCapitalizedAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value2120222122191814192020212324201414111313121213131414121212115438363
Percentage of InterestCostsCapitalizedAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.045.544.433.3100.037.560.037.5

us-gaap:InterestCostsIncurred



Period End2020-03-312019-03-31
Value171188
Percentage of InterestCostsIncurred100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-03-31
Value171188
Percentage of InterestCostsIncurred100.0100.0

us-gaap:InvestmentIncomeInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value263036382931282517161713111114989565584555665747565452135
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value263036382931282517161713111114989565584555665342323252
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.042.9100.028.660.033.360.050.0100.0100.0

us-gaap:LaborAndRelatedExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value295530783063305728732924293028782726270428122868266125682625259224902424253424542301225123442187215321142209217521752127198620382024189720201916180610851020990954963
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value29553078306330572873292429302878272627042812286826612568262525922490242425342454230122512344218721532114220921752175212710681046109310271092103898711291061
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.053.851.354.054.154.154.254.7104.1104.0

us-gaap:LandingFeesAndOtherRentals



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value623650645660588602596603558570585541544553546541525556551553543568567567572546540507507497453504503469476502473268271
Percentage of LandingFeesAndOtherRentals100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value623650645660588602596603558570585541544553546541525556551553543568567567572546540507507497223271281255246275252268271
Percentage of LandingFeesAndOtherRentals100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.049.253.855.954.451.754.853.3100.0100.0

us-gaap:LeaseCost



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value899932961915926991991955
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-12-312011-09-302011-03-31
Value109187861289235065741711196711271560596921177599349107283375-1014791461818513603364
Percentage of NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value109187861289235065741711196711271560596921177599349107283375-10147914618185205136
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Period End2020-03-312019-03-31
Value-495
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent100.0100.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value-165
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent32.7100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent



Period End2020-03-312019-03-31
Value-507
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0

us-gaap:OperatingLeaseCost



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
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us-gaap:OperatingLeasePayments



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value159236222285236290273279
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us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
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Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-53-214303-1410280131233-20520-8-7-31-644354102-122166102-1467-2018-2711017645845826-727181-220138
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
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us-gaap:StatementEquityComponents, dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-53-214303-14102871312
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0102.5100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
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Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value41214-30417-7-288-12-12-30194-3-4822475-1024-5212-28-21050821821-1095-51
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
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us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312011-03-312010-03-31
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dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-1-8927-5-12-61-87-5-222-19-115-8-18-17-14514-18-19-3-26-1-7-37
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.8

us-gaap:PaymentsOfDebtIssuanceCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value351021131766916
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dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value351021131766916
Percentage of PaymentsOfDebtIssuanceCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0902700139020
Percentage of PaymentsToAcquireInterestInSubsidiariesAndAffiliates0.0100.00.0100.00.00.0100.00.0100.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0902700139020
Percentage of PaymentsToAcquireInterestInSubsidiariesAndAffiliates0.0100.00.0100.00.00.0100.00.0100.00.0

us-gaap:PaymentsToAcquireLoansReceivable



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value16410004560010
Percentage of PaymentsToAcquireLoansReceivable100.0100.00.00.0100.00.00.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value16410004560010
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us-gaap:PaymentsToAcquireProductiveAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value19591192869858160915858587559791098112010896918806898388167636731101210660392589364765578446375124222226620551
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value19591192869858160915858587559791098112010896918806898388167636731101210660392589364765578446375400146113125
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.032.265.842.561.0

us-gaap:PaymentsToAcquireShortTermInvestments



Period End2020-03-312019-03-31
Value541724
Percentage of PaymentsToAcquireShortTermInvestments100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value541724577649730596657997813774779716635638
Percentage of PaymentsToAcquireShortTermInvestments100.0100.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PostemploymentBenefitsPeriodExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0226679111415234137101368428255014163814910014007649
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us-gaap:TitleOfIndividual

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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2264445
Percentage of PostemploymentBenefitsPeriodExpense100.0100.0100.066.757.144.445.5

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-31
Value-18-11-1-2930-6-9-3264-2-10-6542-16-22-215-7-6-1538-33-591271-25-12-33-8-21432-10
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value-12-1031-6-8-1664-1-9-5343-16-20216-6-6-638-33-582068-25-12-303-2312
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us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value927714798716768637524
Percentage of ProceedsFromSaleMaturityAndCollectionsOfInvestments100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value927714798716768637524
Percentage of ProceedsFromSaleMaturityAndCollectionsOfInvestments100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromShortTermDebt



Period End2020-03-312019-03-31
Value25000
Percentage of ProceedsFromShortTermDebt100.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-03-31
Value25000
Percentage of ProceedsFromShortTermDebt100.00.0

us-gaap:ProvisionForLoanLossesExpensed



Period End2020-03-312019-03-31
Value6970
Percentage of ProvisionForLoanLossesExpensed100.00.0

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ual:BRWAviationHoldingLLCAndBRWAviationLLCBRW, ual:TermLoanReceivable



Period End2020-03-31
Value697
Percentage of ProvisionForLoanLossesExpensed100.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-03-31
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us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent



Period End2020-03-312019-03-31
Value3-3
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1-2-12-1-233434566
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringSettlementAndImpairmentProvisions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value63130277118301171294031504451-31454341901317655641794316952
Percentage of RestructuringSettlementAndImpairmentProvisions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value63130277118301171294031504451-31454341901317655641794316952
Percentage of RestructuringSettlementAndImpairmentProvisions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CounterpartyName

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Period End2020-03-31
Value10
Percentage of RestructuringSettlementAndImpairmentProvisions15.9

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value191400817000
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability100.0100.00.00.0100.0100.00.00.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value191400817000
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability100.0100.00.00.0100.0100.00.00.00.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3015424548511264340103
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.00.0100.0

dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3015424548511264340103
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:SellingExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value295417432442360396427393342328352362307316345339303316366348312334375346318338377347347328314356345337377375350161154172145139
Percentage of SellingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value295417432442360396427393342328352362307316345339303316366348312334375346318338377347347328158172172182194199187204198
Percentage of SellingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.050.348.349.954.051.553.153.4126.7128.6

us-gaap:SubsequentEventType

us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:SubsequentEvent



Period End2020-04-21
Value43
Percentage of StockIssuedDuringPeriodSharesNewIssues100.0

us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:SubsequentEvent, ual:PublicOffering



Period End2020-04-21
Value39
Percentage of StockIssuedDuringPeriodSharesNewIssues90.9

us-gaap:SubsequentEvent, us-gaap:OverAllotmentOption



Period End2020-04-21
Value3
Percentage of StockIssuedDuringPeriodSharesNewIssues9.1

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value500000.00.00.00.0500000.0200000.00.00.0200000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.00.00.00.0100.0100.00.00.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-191-1-291-1
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-551-3-540-2
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation289.5100.0300.0186.20.0200.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-03-312018-12-31
Value-401-81
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation21.10.0-100.027.6100.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value40013301
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation-210.50.0-100.0-113.80.0-100.0

dei:LegalEntity

us-gaap:StockholdersEquityOther

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value181103002-118
Percentage of StockholdersEquityOther100.0100.0100.00.0100.00.0100.0100.0100.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:ReceivablesFromStockholder, ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value181113011
Percentage of StockholdersEquityOther100.0100.0100.00.0100.00.050.0

us-gaap:SubleaseIncome



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7898891110
Percentage of SubleaseIncome100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value424662067
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value34221536353652719034407569
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value34221536353652724034407569
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0126.3100.0100.0100.0

us-gaap:UnrealizedGainLossOnDerivatives



Period End2020-03-312019-03-31
Value-243
Percentage of UnrealizedGainLossOnDerivatives100.0100.0

us-gaap:UnrealizedGainLossOnInvestments



Period End2020-03-312019-03-312018-12-312018-09-302017-12-312017-09-30
Value-31917562900
Percentage of UnrealizedGainLossOnInvestments100.0100.0100.0100.00.00.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-03-31
Value-31917
Percentage of UnrealizedGainLossOnInvestments100.0100.0

dei:EntityCommonStockSharesOutstanding



Period End2020-04-302020-02-182019-10-112019-07-122019-04-122019-02-222018-10-122018-07-132018-04-122018-02-142017-10-122017-07-122017-04-122017-02-132016-10-112016-07-122016-04-112016-02-092015-10-132015-07-142015-04-132015-02-102014-10-152014-07-142014-04-142014-02-142013-10-152013-07-152013-04-152013-02-072012-10-152012-07-15
Value290247253256263266272272277284296304309314317322336359372377382384369373373371361355333332332332
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-04-302020-02-182019-10-112019-07-122019-04-122019-02-222018-10-122018-07-132018-04-122018-02-142017-10-122017-07-122017-04-122017-02-132016-10-112016-07-122016-04-112016-02-092015-10-132015-07-142015-04-132015-02-102014-10-152014-07-142014-04-142014-02-142013-10-152013-07-152013-04-152013-02-072012-10-152012-07-152012-04-152012-02-162011-10-212011-07-15
Value1000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.01000.0205.0205.0205.0205.0205.0205.0205.0
Percentage of EntityCommonStockSharesOutstanding0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ual:ContractWithCustomerLiabilityCurrentAdvanceTicketSales



Period End2020-03-312019-12-312018-12-31
Value530948194381
Percentage of ContractWithCustomerLiabilityCurrentAdvanceTicketSales100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312018-12-31
Value530948194381
Percentage of ContractWithCustomerLiabilityCurrentAdvanceTicketSales100.0100.0100.0

ual:ContractWithCustomerLiabilityCurrentFrequentFlyer



Period End2020-03-312019-12-312018-12-31
Value135524402286
Percentage of ContractWithCustomerLiabilityCurrentFrequentFlyer100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312018-12-31
Value135524402286
Percentage of ContractWithCustomerLiabilityCurrentFrequentFlyer100.0100.0100.0

ual:ContractWithCustomerLiabilityNoncurrentFrequentFlyer



Period End2020-03-312019-12-312018-12-31
Value413328362719
Percentage of ContractWithCustomerLiabilityNoncurrentFrequentFlyer100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312018-12-31
Value413328362719
Percentage of ContractWithCustomerLiabilityNoncurrentFrequentFlyer100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

ual:DebtInstrumentCovenantMinimumRequiredUnrestrictedCashAndCashEquivalentsAndUnusedCommitments

ual:SparePartsFacility, us-gaap:SecuredDebt



Period End2020-03-20
Value2000
Percentage of DebtInstrumentCovenantMinimumRequiredUnrestrictedCashAndCashEquivalentsAndUnusedCommitments100.0

ual:UsedAircraftFacility, us-gaap:SecuredDebt



Period End2020-03-09
Value2000
Percentage of DebtInstrumentCovenantMinimumRequiredUnrestrictedCashAndCashEquivalentsAndUnusedCommitments0.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

ual:SpareEnginesCreditAgreement, us-gaap:SecuredDebt, us-gaap:SubsequentEvent



Period End2020-04-07
Value2000
Percentage of DebtInstrumentCovenantMinimumRequiredUnrestrictedCashAndCashEquivalentsAndUnusedCommitments0.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

ual:DebtInstrumentCovenantRatioOfCollateralToOutstandingObligationsMinimum

ual:SparePartsFacility, us-gaap:SecuredDebt



Period End2020-03-20
Value1.8
Percentage of DebtInstrumentCovenantRatioOfCollateralToOutstandingObligationsMinimum100.0

ual:UsedAircraftFacility, us-gaap:SecuredDebt



Period End2020-03-09
Value1.6
Percentage of DebtInstrumentCovenantRatioOfCollateralToOutstandingObligationsMinimum0.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

ual:SpareEnginesCreditAgreement, us-gaap:SecuredDebt, us-gaap:SubsequentEvent



Period End2020-04-07
Value1.4
Percentage of DebtInstrumentCovenantRatioOfCollateralToOutstandingObligationsMinimum0.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

ual:DebtInstrumentPercentageIncreaseInFaceAmountUponDisbursements

ual:PayrollSupportProgramPSPNote, us-gaap:UnsecuredDebt, us-gaap:SubsequentEvent



Period End2020-04-20
Value0.3
Percentage of DebtInstrumentPercentageIncreaseInFaceAmountUponDisbursements100.0

ual:DeferredTaxAssetLeasingArrangements



Period End2019-12-312018-12-31
Value12561338
Percentage of DeferredTaxAssetLeasingArrangements100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-31
Value12561338
Percentage of DeferredTaxAssetLeasingArrangements100.0100.0

us-gaap:RetirementPlanType

ual:DefinedBenefitPlanEffectOf50BasisPointDecreaseInDiscountRateOnAccumulatedPostretirementBenefitObligation

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-31
Value42
Percentage of DefinedBenefitPlanEffectOf50BasisPointDecreaseInDiscountRateOnAccumulatedPostretirementBenefitObligation100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-31
Value700
Percentage of DefinedBenefitPlanEffectOf50BasisPointDecreaseInDiscountRateOnAccumulatedPostretirementBenefitObligation1666.7

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ual:EquitySecuritiesWithoutReadilyDeterminableFairValueOwnershipInterest

ual:FulcrumBioEnergyInc.



Period End2019-12-31
Value0.07
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueOwnershipInterest100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument

ual:FulcrumBioEnergyInc., us-gaap:PreferredStock



Period End2019-12-31
Value0.08
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueOwnershipInterest114.3

us-gaap:StatementGeographical, us-gaap:SubsequentEventType

ual:IncreaseDecreaseInDemandDueToTravelRestrictionsPercent

country:CN, us-gaap:SubsequentEvent



Period End2020-02-24
Value-1.0
Percentage of IncreaseDecreaseInDemandDueToTravelRestrictionsPercent100.0

ual:TransPacificCountriesExcludingChina, us-gaap:SubsequentEvent



Period End2020-02-24
Value-0.75
Percentage of IncreaseDecreaseInDemandDueToTravelRestrictionsPercent75.0

us-gaap:AircraftType

ual:NumberOfAircraftExpectedToTakeDeliveryNextTwelveMonths

srt:B777300



Period End2019-12-31
Value2.0
Percentage of NumberOfAircraftExpectedToTakeDeliveryNextTwelveMonths100.0

ual:AirbusA321XLR



Period End2019-12-31
Value0.0
Percentage of NumberOfAircraftExpectedToTakeDeliveryNextTwelveMonths0.0

ual:AirbusA350



Period End2019-12-31
Value0.0
Percentage of NumberOfAircraftExpectedToTakeDeliveryNextTwelveMonths0.0

ual:Boeing737Max



Period End2019-12-31
Value44.0
Percentage of NumberOfAircraftExpectedToTakeDeliveryNextTwelveMonths2200.0

ual:Boeing787



Period End2019-12-31
Value15.0
Percentage of NumberOfAircraftExpectedToTakeDeliveryNextTwelveMonths750.0

ual:EmbraerE175



Period End2019-12-31
Value20.0
Percentage of NumberOfAircraftExpectedToTakeDeliveryNextTwelveMonths1000.0

us-gaap:ProductOrService

ual:NumberOfAircraftSubjectToFinanceLeases

us-gaap:Mainline



Period End2019-12-312019-09-302019-06-302019-03-31
Value28.026.026.030.0
Percentage of NumberOfAircraftSubjectToFinanceLeases100.0100.0100.0100.0

us-gaap:RegionalCarrier



Period End2019-12-312019-09-302019-06-302019-03-31
Value17.028.047.076.0
Percentage of NumberOfAircraftSubjectToFinanceLeases60.7107.7180.8253.3

us-gaap:ProductOrService

ual:NumberOfAircraftSubjectToOperatingLeases

us-gaap:Mainline



Period End2019-12-312019-09-302019-06-302019-03-31
Value114.0117.0121.0122.0
Percentage of NumberOfAircraftSubjectToOperatingLeases100.0100.0100.0100.0

us-gaap:RegionalCarrier



Period End2019-12-312019-09-302019-06-302019-03-31
Value325.0325.0339.0341.0
Percentage of NumberOfAircraftSubjectToOperatingLeases285.1277.8280.2279.5

us-gaap:AircraftType, us-gaap:SubsequentEventType

ual:NumberOfAircraftSubjectToPurchaseRightsAssignmentAgreement

ual:Boeing737Max, us-gaap:SubsequentEvent



Period End2020-04-17
Value16.0
Percentage of NumberOfAircraftSubjectToPurchaseRightsAssignmentAgreement100.0

ual:Boeing787, us-gaap:SubsequentEvent



Period End2020-04-17
Value6.0
Percentage of NumberOfAircraftSubjectToPurchaseRightsAssignmentAgreement37.5

us-gaap:AircraftType

ual:NumberOfAircraftsExpectedToTakeDeliveryRemainderOfYear

ual:AirbusA321XLR



Period End2020-03-31
Value0.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryRemainderOfYear0.0

ual:AirbusA350



Period End2020-03-31
Value0.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryRemainderOfYear0.0

ual:Boeing787



Period End2020-03-312019-09-302019-06-30
Value11.02.02.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryRemainderOfYear0.00.00.0

ual:EmbraerE175



Period End2020-03-312019-09-302019-06-30
Value16.09.018.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryRemainderOfYear0.00.00.0

us-gaap:AircraftType

ual:NumberOfAircraftsExpectedToTakeDeliveryThereafter

ual:Boeing787



Period End2020-03-312019-12-312019-09-302019-06-30
Value0.01.01.01.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryThereafter0.0100.0100.0100.0

us-gaap:AircraftType

ual:NumberOfAircraftsExpectedToTakeDeliveryYearTwo

ual:AirbusA321XLR



Period End2020-03-31
Value0.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryYearTwo0.0

ual:AirbusA350



Period End2020-03-31
Value0.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryYearTwo0.0

ual:Boeing787



Period End2020-03-312019-09-302019-06-302019-03-31
Value8.015.015.015.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryYearTwo0.00.00.00.0

ual:EmbraerE175



Period End2020-03-312019-09-302019-06-30
Value4.020.020.0
Percentage of NumberOfAircraftsExpectedToTakeDeliveryYearTwo0.00.00.0

ual:OtherLiabilitiesAndDeferredCreditsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value89237831718075787428
Percentage of OtherLiabilitiesAndDeferredCreditsNoncurrent100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value89517859720776067455
Percentage of OtherLiabilitiesAndDeferredCreditsNoncurrent100.3100.4100.4100.4100.4

us-gaap:SubsequentEventType

ual:PayrollSupportProgramFundingProvided

us-gaap:SubsequentEvent



Period End2020-04-20
Value5000
Percentage of PayrollSupportProgramFundingProvided100.0

ual:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization



Period End2020-03-312019-12-31
Value1501114537
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-31
Value1501114537
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization100.0100.0

ual:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization



Period End2020-03-312019-12-31
Value3181130170
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-31
Value3181130170
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0

ual:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization



Period End2020-03-312019-12-31
Value4682244707
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-31
Value4682244707
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

ual:RestrictedCashFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value106106104105103105105107106109109130129124124167180206208283301320316351389395
Percentage of RestrictedCashFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value106106104105103105105107106109109130129124124167180206208283301320316351389395
Percentage of RestrictedCashFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased, dei:LegalEntity

us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:RegionalCarrier, ual:CapacityPurchaseAgreements, ual:UnitedAirLinesInc



Period End2019-12-312018-12-31
Value6953
Percentage of AccountsPayableRelatedPartiesCurrent100.0100.0

us-gaap:AdditionalPaidInCapitalCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value60966129611160966080612061056091607760986591657765626569797479657956794679417938793277217620763676667425741073547159714571407135713071147110710671007071315231463136
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value100008459882284112331787232528663271357337183964464861386652691271567347743375407598759076367631762534443442343934353432343034283421
Percentage of AdditionalPaidInCapitalCommonStock0.20.00.00.01.49.813.513.820.329.335.343.649.854.446.649.858.477.283.887.190.295.297.598.799.1102.2103.0103.8106.548.248.248.248.248.248.248.248.4

us-gaap:AirlineRelatedInventoryNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1070107210659969729851011942924924937882900873842798759738704656631666700685641667646555690695675611645615628508466
Percentage of AirlineRelatedInventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1070107210659969729851011942924924937882900873842798759738704656631666700685641667646555690402379327335340347243321
Percentage of AirlineRelatedInventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.057.856.153.551.955.355.347.868.9

us-gaap:AirlineRelatedInventoryValuationReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4464254033874214123963803653543423293142952632612492352261871781691611811701621571451361251111039689817464
Percentage of AirlineRelatedInventoryValuationReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4464254033874214123963803653543423293142952632612492352261871781691611811701621571451368681787573696761
Percentage of AirlineRelatedInventoryValuationReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.068.873.075.778.182.085.290.595.3

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3091198867771111101012121118182223222415171316212013121287766614
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3091198867771111101012121118182223222415171316212011101055655
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.084.683.383.362.571.485.783.383.3

us-gaap:StatementEquityComponents

us-gaap:AociBeforeTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value-613-560-285-675-654-663-1033-1048-1063-1102-855-860-867-854-503-385-401-363-472
Percentage of AociBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value-142231-4-1-2-3-613
Percentage of AociBeforeTaxAttributableToParent2.3-0.4-0.7-0.4-0.20.60.10.20.30.5-0.1-0.8

us-gaap:AociTaxAttributableToParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value144160221135140136-55-52-48-3921323026-256-116
Percentage of AociTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareGross



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value422359345356279281290302
Percentage of CapitalizedComputerSoftwareGross100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value34422762295932211848169426212884240414821870237121642179263024831795300634272796335220023117342430093220
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value34422762295932211848169426212884240414821870237121642179263024831795300634272796335220023117342430093220
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ClassOfWarrantOrRight, us-gaap:SubsequentEventType

us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights

ual:InitialWarrantIssuance, us-gaap:SubsequentEvent



Period End2020-04-20
Value2
Percentage of ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights100.0

us-gaap:SubsequentEventType

us-gaap:SubsequentEvent



Period End2020-04-20
Value4
Percentage of ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights200.0

us-gaap:ProductOrService

us-gaap:ContractWithCustomerLiability

ual:FrequentFlyerProgram



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value5488527652195198513850054987498949374783
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractualObligation



Period End2019-12-312019-09-302019-06-302018-12-312017-12-312017-09-302017-06-302017-03-31
Value1570012300125001130011500120001090010700
Percentage of ContractualObligation100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument

ual:LoansAndLeasesFromNonUSEntities



Period End2019-12-312019-09-302019-06-302018-12-312017-12-312017-09-302017-06-302017-03-31
Value32003100320032003300320031003000
Percentage of ContractualObligation20.425.225.628.328.726.728.428.0

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption



Period End2020-01-012018-01-012017-01-01
Value-17014
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.00.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-01-012017-01-01
Value-17-14
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0-100.0

us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201613



Period End2020-01-01
Value-17
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-01-012018-01-012017-01-01
Value-17-614
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.00.0100.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:RetainedEarnings, ual:UnitedAirLinesInc



Period End2020-01-01
Value-17
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet



Period End2019-12-312018-12-31
Value181191
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0

us-gaap:DeferredIncomeTaxLiabilities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value579636783234528754324841
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value579636783234528754324805
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.099.3

us-gaap:DeferredIncomeTaxLiabilitiesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1322173615941192898814639419204
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1350176316221220925842666446231
Percentage of DeferredIncomeTaxLiabilitiesNet102.1101.6101.8102.3103.0103.4104.2106.4113.2

us-gaap:DeferredTaxAssetsDeferredIncome



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value128712321069209621602287
Percentage of DeferredTaxAssetsDeferredIncome100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value128712321069209621602287
Percentage of DeferredTaxAssetsDeferredIncome100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards



Period End2019-12-312018-12-312017-12-31
Value695398601
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-31
Value668372574
Percentage of DeferredTaxAssetsOperatingLossCarryforwards96.193.595.5

us-gaap:DeferredTaxAssetsOther



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value16540835152356665721794712011031
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value165406351522566659217343560
Percentage of DeferredTaxAssetsOther100.099.5100.099.8100.0100.3100.036.246.6

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7158851051166216621943170124881897
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7158851051166216621943170116481275
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits100.0100.0100.0100.0100.0100.0100.066.267.2

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value7247498031326151115451585157816271699
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7247498031326151115451585819833
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.051.951.2

us-gaap:DeferredTaxLiabilitiesLeasingArrangements



Period End2019-12-312018-12-31
Value10611173
Percentage of DeferredTaxLiabilitiesLeasingArrangements100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-31
Value10611173
Percentage of DeferredTaxLiabilitiesLeasingArrangements100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value40112929243139613921
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value40112929243139613921
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
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dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value151414461087136614541576161118151828192116311739185118921220140914691488151114682082222615171589162616501803193723859784848592105100101
Percentage of DefinedBenefitPensionPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.04.04.74.54.64.97.46.96.9

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us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value5333444847394158
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0

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us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value1096724509629
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-1656-1387-1611-1483
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us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-403-554-301-384
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value1652138216101482
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax-409.9-249.5-534.9-385.9

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value693170208245
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-4-5-1-1
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax-0.6-2.9-0.5-0.4

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-790-1338-1656-1632
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-1434-1569-1920-1898
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet181.5117.3115.9116.3

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value141392
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:DefinedBenefitPostretirementHealthCoverage



Period End2019-12-31
Value0.0339
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value0.03350.0430.03630.0407
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate98.80.00.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value0.03520.0420.03650.0418
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate103.80.00.00.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value0.03890.03890.03890.0354
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value8421391171016872002
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value63985396585252534473
Percentage of DefinedBenefitPlanBenefitObligation759.9387.9342.2311.4223.4

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value328575646
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value221920221912
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter676.5351.7296.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value53100113
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value361329305
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths681.1329.0269.9

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value64113126
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value399379369
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive623.4335.4292.9

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value62111124
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value410367357
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour661.3330.6287.9

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value59108121
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value399353331
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree676.3326.9273.6

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value56104118
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value386327326
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo689.3314.4276.3

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-31
Value4795
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value314318
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear668.1334.7

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-790-1338-1656-1632
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-1434-1569-1920-1898
Percentage of DefinedBenefitPlanFundedStatusOfPlan181.5117.3115.9116.3

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value0.060.060.06250.065
Percentage of DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5137428645673985365539303245386932302906
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4714361437093164279423872176199117311742
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value6161519656375025429246253820438735943202
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Range, us-gaap:DefinedBenefitPlanByPlanAssetCategories, dei:LegalEntity

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

srt:Maximum, ual:Alternative, ual:UnitedAirLinesInc



Period End2019-12-31
Value0.25
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage100.0

srt:Maximum, us-gaap:DefinedBenefitPlanEquitySecurities, ual:UnitedAirLinesInc



Period End2019-12-31
Value0.45
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage180.0

srt:Maximum, us-gaap:FixedIncomeFunds, ual:UnitedAirLinesInc



Period End2019-12-31
Value0.5
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage200.0

srt:Minimum, ual:Alternative, ual:UnitedAirLinesInc



Period End2019-12-31
Value0.15
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage60.0

srt:Minimum, us-gaap:DefinedBenefitPlanEquitySecurities, ual:UnitedAirLinesInc



Period End2019-12-31
Value0.3
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage120.0

srt:Minimum, us-gaap:FixedIncomeFunds, ual:UnitedAirLinesInc



Period End2019-12-31
Value0.35
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage140.0

us-gaap:DepositsOnFlightEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value185913601446135114551177110189410251344104482292210591068919866788736951602706734799688706674610534462613450418382359304230
Percentage of DepositsOnFlightEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value185913601446135114551177110189410251344104482292210591068919866788736951602706734799688706674610534219183606057575451
Percentage of DepositsOnFlightEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.047.429.913.314.414.915.917.822.2

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeAssets

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value02461014110
Percentage of DerivativeAssets0.0100.0100.0100.0100.0100.00.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value02461014110
Percentage of DerivativeAssets0.0100.0100.0100.0100.0100.00.0

us-gaap:EmployeeRelatedLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value16472271210418711660218420041782163721661983181215692307228219691822235021871846159718181651146013631696184414801455176313281230113915091404122912081470918817701
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value164722712104187116602184200417821637216619831812156923072282196918222350218718461597181816511460136316961844148014551204760777789988907772938
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.068.357.263.269.365.564.662.863.8

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1147790110846869861025390123127657971934148729062627490445545583343474943576343
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AwardType

us-gaap:EmployeeStockOption



Period End2019-12-312018-12-312017-12-312016-12-31
Value11245
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized14.32.97.57.7

us-gaap:RestrictedStockUnitsRSU



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value6666464937553624
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized85.797.186.875.490.288.781.872.7

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentOwnershipPercentage

ual:ManaAirLLC



Period End2019-12-31
Value0.499
Percentage of EquityMethodInvestmentOwnershipPercentage100.0

us-gaap:EquitySecuritiesFvNi



Period End2020-03-31
Value92
Percentage of EquitySecuritiesFvNi100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value92385322301249
Percentage of EquitySecuritiesFvNi100.00.00.00.00.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2019-12-312019-09-302019-06-302018-12-31
Value385322301249
Percentage of EquitySecuritiesFvNi0.00.00.00.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

ual:Azul



Period End2020-03-312019-12-31
Value92385
Percentage of EquitySecuritiesFvNi100.00.0

us-gaap:FinanceLeaseLiabilityCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value594692117133123
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value594692117133123
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3692201862022361134996
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value369220186202236224
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.019.8

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0570.4480.5320.5050.4580.3950.0670.067
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLosses



Period End2020-03-31
Value549.0
Percentage of FinancingReceivableAllowanceForCreditLosses100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-31
Value549
Percentage of FinancingReceivableAllowanceForCreditLosses100000000.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value14541440142514101395138013631346132913131294127412541234121211901167114411201093107610491019987954933900864828792762732701670630587547504456440408
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value14541440142514101395138013631346132913131294127412541234121211901167114411201093107610491019987954933900864828588575561547534518503473
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.074.275.576.678.079.782.285.793.8

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

ual:Contracts



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value111106103958686867564
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization7.77.77.87.77.58.29.29.59.6

ual:FrequentFlyerDatabase



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value931884832771702624536447381
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization64.764.163.462.561.459.557.456.456.9

ual:Hubs



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1049789827467595244
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization7.27.06.86.66.56.46.36.66.6

us-gaap:OtherIntangibleAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2948884817767564434
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization20.46.46.46.66.76.46.05.65.1

us-gaap:FiniteLivedIntangibleAssetsGross



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value175617561757177117711791180418051806
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

ual:Contracts



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value120120121135135155167167167
Percentage of FiniteLivedIntangibleAssetsGross6.86.86.97.67.68.79.39.39.2

us-gaap:OtherIntangibleAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value314109109109109109109109109
Percentage of FiniteLivedIntangibleAssetsGross17.96.26.26.26.26.16.06.06.0

us-gaap:FlightEquipmentGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value3676335421344133389033705316073051630143296512869229043283972718725873250932485323728
Percentage of FlightEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value3676335421344133389033705316073051630143296512869229043283972718725873250932485323728
Percentage of FlightEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:GuaranteeObligationsByNature

us-gaap:GuaranteeObligationsCurrentCarryingValue

ual:TaxExemptBonds, us-gaap:IndirectGuaranteeOfIndebtedness



Period End2019-12-312018-12-312012-12-31
Value19001700259
Percentage of GuaranteeObligationsCurrentCarryingValue100.0100.0100.0

us-gaap:DebtInstrument

us-gaap:GuaranteeObligationsMaximumExposure

ual:AircraftMortgageDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value12913213613914214514815115415715916316616817143
Percentage of GuaranteeObligationsMaximumExposure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ual:TaxExemptBonds



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-31
Value1900190019001900190019002000200020001800180019001900190019001900190018001900
Percentage of GuaranteeObligationsMaximumExposure1472.91439.41397.11366.91338.01310.31351.41324.51298.71146.51132.11165.61144.61131.01111.14418.60.00.00.0

us-gaap:DebtInstrument, us-gaap:GuaranteeObligationsByNature

ual:TaxExemptBonds, us-gaap:IndirectGuaranteeOfIndebtedness



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value17516424423422414002501300
Percentage of GuaranteeObligationsMaximumExposure132.6113.1155.4139.30.00.00.00.0

us-gaap:LongtermDebtType

ual:TaxExemptBonds



Period End2019-12-31
Value1900
Percentage of GuaranteeObligationsMaximumExposure1439.4

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value269327833095309535093542356535843614
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

ual:AirportSlotsAndGatesIndefiniteLived



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value546546536536942956
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill20.319.617.317.326.827.0

ual:RouteAuthorities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value115012401562156215701589160516061606
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill42.744.650.550.544.744.945.044.844.4

us-gaap:InvestmentsAndOtherNoncurrentAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value7631180113111391098966848848853852882579
Percentage of InvestmentsAndOtherNoncurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value7631180113111391098966849848853852882579
Percentage of InvestmentsAndOtherNoncurrentAssets100.0100.0100.0100.0100.0100.0100.1100.0100.0100.0100.0100.0

us-gaap:CreditFacility, us-gaap:FinancialInstrument, dei:LegalEntity

us-gaap:LineOfCredit

us-gaap:LetterOfCredit, us-gaap:CollateralizedDebtObligations, ual:UnitedAirLinesInc



Period End2019-12-31
Value73
Percentage of LineOfCredit100.0

us-gaap:GuaranteeObligationsByNature, dei:LegalEntity

us-gaap:SuretyBond, ual:UnitedAirLinesInc



Period End2019-12-31
Value414
Percentage of LineOfCredit567.1

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtFairValue

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value125241139811131109151030795259736987910377101159640917890408184835984258309864684378573928285688290918286848829742875898045
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value32443805370137763829392534943564369136723577342832812871285927162871272531382815295038184096358938523866460845645374
Percentage of LongTermDebtFairValue25.933.433.234.637.141.235.936.135.636.337.137.436.335.134.232.234.631.537.232.831.844.649.439.144.443.862.060.166.8

us-gaap:FairValueByMeasurementBasis

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value1576815203148321469114136134501323013443140681378713217126061232111055112181114111180113711157511388122321238612386127711253612695120361215313419
Percentage of LongTermDebtFairValue125.9133.4133.2134.6137.1141.2135.9136.1135.6136.3137.1137.4136.3135.1134.2132.2134.6131.5137.2132.8131.8144.6149.4139.1144.4143.8162.0160.1166.8

us-gaap:NotesAndLoansReceivableNetNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value14967152951851251646
Percentage of NotesAndLoansReceivableNetNoncurrent100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value14967152951851251646
Percentage of NotesAndLoansReceivableNetNoncurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLiabilityCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value688686778637639719
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value688686778637639719
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value506049464941503451455276
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value506049464941503451455276
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0520.0530.0530.0520.0520.0520.0510.05
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0100.0100.0100.0

ual:NetOperatingLossCarryforwardByExpiration

us-gaap:OperatingLossCarryforwards

ual:NetOperatingLossCarryForwardExpirationPeriodThereafter



Period End2019-12-312018-12-31
Value5001000
Percentage of OperatingLossCarryforwards100.0100.0

ual:NetOperatingLossCarryForwardExpirationYear2030



Period End2019-12-312018-12-31
Value700600
Percentage of OperatingLossCarryforwards140.060.0

ual:NetOperatingLossCarryForwardExpirationYear2033



Period End2019-12-31
Value500
Percentage of OperatingLossCarryforwards100.0

us-gaap:IncomeTaxAuthority

us-gaap:DomesticCountry



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value30001600240044008000
Percentage of OperatingLossCarryforwards600.0160.00.00.00.0

us-gaap:StateAndLocalJurisdiction



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value100834956103
Percentage of OperatingLossCarryforwards20.08.30.00.00.0

us-gaap:OtherCommitments, us-gaap:SubsequentEventType

us-gaap:OtherCommitment

ual:AVHSeniorSecuredConvertibleLoan, us-gaap:SubsequentEvent



Period End2019-10-04
Value150
Percentage of OtherCommitment100.0

us-gaap:OtherCommitments, us-gaap:SubsequentEventType, dei:LegalEntity

ual:AVHSeniorSecuredConvertibleLoan, us-gaap:SubsequentEvent, ual:UnitedAirlineHoldingsAndKingslandHoldingsLimitedLenders



Period End2019-10-04
Value250
Percentage of OtherCommitment166.7

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherLongTermInvestments

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value160
Percentage of OtherLongTermInvestments100.00.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-31
Value160
Percentage of OtherLongTermInvestments100.00.0

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value77578983612771287129515771585159316021588159716081581192718801879188219181927193319331684168917011703265326422632261424612438241524072393238323662344194819401928
Percentage of OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7757898361277128712951577158515931602158815971608158119271880187918821918192719331933168416891701170326532642263223842156213821192115212721212091
Percentage of OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.091.287.687.787.787.988.989.089.2

us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value1435451
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value2688
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities200.014.014.815.7

us-gaap:PropertyPlantAndEquipmentOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value82007926762673717165791977657481719369466186610358875652523749474715454243424220409240163934385037593687347435273357326931513118306631263059299329212890180517671745
Percentage of PropertyPlantAndEquipmentOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8200792676267371716579197765748171936946618661035887565252374947471545424342422040924016393438503759368734743527335722622197219021702260221321612086
Percentage of PropertyPlantAndEquipmentOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.069.269.770.270.872.372.372.272.2

dei:LegalEntity

us-gaap:ReceivableFromShareholdersOrAffiliatesForIssuanceOfCapitalStock

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value161143142141140110108108108909089836752525221717151453232
Percentage of ReceivableFromShareholdersOrAffiliatesForIssuanceOfCapitalStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue

us-gaap:PrepaidExpensesAndOtherCurrentAssets



Period End2019-12-312018-12-312018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value0011181315014318244
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue0.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation, dei:LegalEntity

us-gaap:PrepaidExpensesAndOtherCurrentAssets, ual:UnitedAirLinesInc



Period End2019-12-312018-12-312017-12-31
Value0018
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue0.00.0100.0

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312010-09-302010-06-302009-12-31
Value10610610010510310510594959196115129124123124162204206214271276284303340364382192197213
Percentage of RestrictedCashAndCashEquivalentsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

ual:UnitedAirLinesInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value10610610010510310510594959196115129124123124162204206214271276284303340364382
Percentage of RestrictedCashAndCashEquivalentsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

ual:RestrictedStockUnitsRSUsEquityAwards



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value21100
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.00.0

ual:RestrictedStockUnitsRSUsLiabilityAwards



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value01122
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber30.0105.6128.6262.50.0

us-gaap:RestrictedStock



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value0.0100000.0300000.0500000.0300000.0700000.01000000.0772000.0985000.0671000.0811000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.05.621.462.50.00.00.00.00.00.00.0

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

ual:RestrictedStockUnitsRSUsEquityAwards



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value78.0366.2963.9951.670.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.00.0

us-gaap:RestrictedStock



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value0.051.1752.352.048.6832.5525.0223.9423.3317.227.82
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue0.077.281.7100.60.00.00.00.00.00.00.0

us-gaap:AircraftType

us-gaap:UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired

srt:B777300



Period End2019-12-312019-09-302019-06-30
Value2.04.04.0
Percentage of UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired100.0100.0100.0

ual:Boeing737700



Period End2020-03-312019-12-312019-09-302019-06-30
Value18.019.020.019.0
Percentage of UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired0.0950.0500.0475.0

ual:Boeing737Max



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value171.0171.0171.0171.0171.0175.0154.0155.0
Percentage of UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired0.08550.04275.04275.00.00.00.00.0

ual:Boeing787



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value19.016.018.018.020.024.027.018.0
Percentage of UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired0.0800.0450.0450.00.00.00.00.0

ual:EmbraerE175



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value20.020.029.038.025.025.025.0
Percentage of UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired0.01000.0725.0950.00.00.00.0

us-gaap:ValuationAllowancesAndReservesType, dei:LegalEntity

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:AllowanceForCreditLoss, ual:UalAndUnited



Period End2019-12-312018-12-312017-12-312016-12-31
Value98710
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0

us-gaap:InventoryValuationReserve, ual:UalAndUnited



Period End2019-12-312018-12-312017-12-312016-12-31
Value425412354295
Percentage of ValuationAllowancesAndReservesBalance4722.25150.05057.12950.0

us-gaap:ValuationAllowanceOfDeferredTaxAssets, ual:UalAndUnited



Period End2019-12-312018-12-312017-12-312016-12-31
Value58596368
Percentage of ValuationAllowancesAndReservesBalance644.4737.5900.0680.0

Line plots across dimensions of each concept

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AirlineDestinations


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, dei:LegalEntity


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents, dei:LegalEntity


us-gaap:LongTermDebt us-gaap:DebtInstrument


us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents, dei:LegalEntity