CTL


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesAuthorized

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
us-gaap:StatementClassOfStock

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:StatementClassOfStock

us-gaap:EarningsPerShareBasic
us-gaap:StatementClassOfStock

us-gaap:EarningsPerShareDiluted
us-gaap:StatementClassOfStock

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:Revenues
us-gaap:AdjustmentsForChangeInAccountingPrinciple
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:ProductOrService
us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold
us-gaap:AdjustmentsForChangeInAccountingPrinciple
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:CostsAndExpenses

us-gaap:SellingGeneralAndAdministrativeExpense
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingIncomeLoss

us-gaap:InterestExpense
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:LongtermDebtType
us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense
us-gaap:ConsolidationItems

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeTaxesPaidNet

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
us-gaap:StatementClassOfStock
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:Assets

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:AccountsPayableCurrent

us-gaap:TaxesPayableCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:DebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:StockholdersEquity
us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:ShareBasedCompensation
us-gaap:ConsolidationItems

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends

us-gaap:RepaymentsOfLongTermDebt

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:CapitalizedContractCost
ctl:CapitalizedContractCostIncurred

ctl:GainLossonExtinguishmentofDebtOperatingActivities

ctl:IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
ctl:NumberOfCategoriesOfProductsAndServices

ctl:OperatingExpensesExcludingDepreciationAmortizationandImpairment
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ctl:OperatingLeaseLeaseIncomePercentofOperatingRevenue
us-gaap:StatementEquityComponents
us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AmortizationOfIntangibleAssets
us-gaap:StatementClassOfStock
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:CapitalizedContractCost
us-gaap:CapitalizedContractCostAmortization

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:SubsequentEventType
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1

us-gaap:ContractWithCustomerLiabilityRevenueRecognized
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:VariableRate, dei:LegalEntity
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:LongtermDebtType, us-gaap:VariableRate, dei:LegalEntity
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DepreciationAndAmortization
us-gaap:ConsolidationItems
us-gaap:StatementEquityComponents
us-gaap:DividendsCommonStock

us-gaap:FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation
us-gaap:StatementBusinessSegments

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:StatementBusinessSegments

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:StatementBusinessSegments

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:StatementBusinessSegments

us-gaap:GoodwillImpairmentLoss
us-gaap:ConsolidationItems

us-gaap:ImpairmentOfLongLivedAssetsToBeDisposedOf

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccruedTaxesPayable

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet

us-gaap:IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations
us-gaap:StatementClassOfStock
us-gaap:IncrementalCommonSharesAttributableToConversionOfDebtSecurities
us-gaap:StatementClassOfStock
us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestPaidCapitalized

us-gaap:InterestPaidNet
us-gaap:StatutoryAccountingPracticesByJurisdiction
us-gaap:LitigationSettlementAmountAwardedToOtherParty
dei:LegalEntity
us-gaap:LossContingencyDamagesSoughtValue

us-gaap:NumberOfReportableSegments

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:OperatingLeaseLeaseIncome

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax
us-gaap:DerivativeInstrumentRisk
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
us-gaap:ConsolidationItems
us-gaap:OtherCostAndExpenseOperating
us-gaap:ConsolidationItems
us-gaap:OtherNonoperatingIncome

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit

us-gaap:ProceedsFromSaleOfProductiveAssets

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:StatementBusinessSegments

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:RepaymentsOfDebt
dei:LegalEntity
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, dei:LegalEntity

us-gaap:RevenueNotFromContractWithCustomer
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueOther
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross
us-gaap:StatementClassOfStock
us-gaap:WeightedAverageNumberOfSharesIssuedBasic
us-gaap:StatementClassOfStock
us-gaap:WeightedAverageNumberOfSharesRestrictedStock

ctl:FinanceLeaseandOtherObligations

ctl:IntangibleAssetsNetIncludingGoodwillAndOtherAssetsNoncurrent

us-gaap:AccountsReceivableGross

us-gaap:AccountsReceivableNet

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent

us-gaap:BankOverdrafts
us-gaap:CapitalizedContractCost
us-gaap:CapitalizedContractCostNet
us-gaap:CapitalizedContractCost
us-gaap:CapitalizedContractCostNetCurrent

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity
us-gaap:DebtInstrumentCarryingAmount
us-gaap:LongtermDebtType, dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType, dei:LegalEntity
us-gaap:DebtInstrumentRepurchasedFaceAmount

us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet

us-gaap:DeferredCreditsAndOtherLiabilitiesNoncurrent

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:StatementBusinessSegments
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:IncomeTaxesReceivable

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:InterestPayableCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:LongTermDebtFairValue
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity
us-gaap:LongtermDebtWeightedAverageInterestRate
us-gaap:LongtermDebtType, dei:LegalEntity

us-gaap:LossContingencyEstimateOfPossibleLoss
us-gaap:LitigationStatus, ctl:LitigationByCase
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LitigationStatus, ctl:LitigationByCase
us-gaap:LossContingencyRangeOfPossibleLossPortionNotAccrued
us-gaap:Range, us-gaap:LitigationStatus, ctl:LitigationByCase

us-gaap:MaterialsSuppliesAndOther

us-gaap:OtherAssetsMiscellaneousCurrent

us-gaap:OtherIntangibleAssetsNet

us-gaap:PreferredStockSharesIssued

us-gaap:PreferredStockSharesOutstanding

us-gaap:PreferredStockValue

us-gaap:PrepaidExpenseCurrent

us-gaap:RestrictedCashCurrent

us-gaap:RestrictedCashNoncurrent
us-gaap:RestructuringCostAndReserve
us-gaap:RestructuringReserve

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ██████████▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄▁▁1098109010901090109010801081107910791069550550549547547546546544554563566569571571575584593604616626623622621619617602305304NANANA
us-gaap:CommonStockSharesIssued ██████████▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄▁▁1097109010901090109010801080107810781069549549548546546545546543554562565568570571575583593604615625623622621618617601305304NANANA
us-gaap:CommonStockSharesOutstanding ██████████▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄▁▁1097109010901090109010801080107810781069549549548546546545546543554562565568570571575583593604615625623622621618617601305304NANANA
us-gaap:CommonStockSharesAuthorized █▅██▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▁▁▁▁▁▁22001600220022001600160016001600160016001600160016001600160016001600160016001600160016001600160016001600160016001600160016001600800800800800800800NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 1081NA107410721068NA107210681069NA541542541NA540540540NA555559563NA567569575NA594605621NA623621620NA6136000NA3013000
 us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassA1081NA107410721068NA107210681069NA541542541NA540540540NA555559563NANANANANANANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 1075NA107210711068NA106610641065NA541541540NA539539538NA554558561NA565567574NA594604619NA621619618NA6125980NA3003000
 us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:StatementClassOfStock us-gaap:CommonClassA1075NA107210711068NA106610641065NA541541540NA539539538NA554558561NANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasic ▇▇▇▇▁▄▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▅▇▇▇▇▇▇▇▇▇▇▇███0.290.210.280.35-5.77-2.260.250.270.111.260.170.030.30.080.280.360.440.620.370.260.340.330.330.340.350.41-1.760.450.480.370.430.120.320.180.230.170.690.740.760.790.84
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock us-gaap:CommonClassA0.29NA0.280.35-5.77NA0.250.270.11NA0.170.030.3NA0.280.360.44NA0.370.260.34NANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareDiluted ▇▇▇▇▁▄▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▅▇▇▇▇▇▇▇▇▇▇▇███0.290.210.280.35-5.77-2.260.250.270.111.260.170.030.30.080.280.360.440.620.370.260.340.330.330.340.350.41-1.760.440.480.370.430.120.320.180.230.170.690.740.760.790.84
 us-gaap:EarningsPerShareDiluted us-gaap:StatementClassOfStock us-gaap:CommonClassA0.29NA0.280.35-5.77NA0.250.270.11NA0.170.030.3NA0.280.360.44NA0.370.260.34NANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▆█▇▇▇████▇▅▅▅▅▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▁▁▁▁▁47475570525152225289577855065577563353234034409042094289438243984401447645544419445144384514454145384542451545254513458345714612461046534596440616951722174817721800
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax ▇▇▇▇██▇▇█▇▅▅▅▅▅▅▅▆▆▅▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▅▁▁▁▁▁52285570560655785647577855065577594553234034409042094289438243984401447645544419445144384514454145384542451545254513458345714612461046534596440616951722174817721800
us-gaap:Revenues ▇▇▇▇█████▇▅▅▅▅▅▅▅▆▆▅▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▅▁▁▁▁▁52285570560655785647577858185902594553234034409042094289438243984401447645544419445144384514454145384542451545254513458345714612461046534596440616951722174817721800
 us-gaap:Revenues us-gaap:ConsolidationItems us-gaap:OperatingSegments▅▆▆▆▆█▆▆▆▆▁▁▂5228557056065578564763245640571757625674384539074037NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:ProductOrService us-gaap:OperatingSegments,ctl:Broadband█▇▇▇█▁▁▂▄722718718718722703702705712NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:ProductOrService us-gaap:OperatingSegments,ctl:IPDataServices▁██▆▇█▆▇▇162417611760173017491756172417461735NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:ProductOrService us-gaap:OperatingSegments,ctl:TransportInfrastructure▁▅▅▄▄▇▇██123213131309129112901356134513641368NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:ProductOrService us-gaap:OperatingSegments,ctl:VoiceCollaboration▁▃▄▄▅▆▆▇█9209801013100510231053105610891111NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ctl:Broadband,ctl:Consumer█▇▇▇█▁▁▂▄722718718718722703702705712NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ctl:IPDataServices,ctl:Enterprise▁█▇▆▇▆▄▅▄628703691681688682659667665NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ctl:Consumer▃▅▆▇█▁▄▄▅▆▇██1327138613981417144112851355135213791400142014371447NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ctl:Enterprise▁██▅▆█▅▆▇142015551550150515231558150515231547NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,ctl:InternationalandGlobalAccounts▁▅▄▅▄▇▄▅█865904899902891923892903935NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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us-gaap:NonoperatingIncomeExpense ▂▃▂▄▂▂▁▂▂▄▇███▇▇███████▇█-547-498-540-474-528-524-565-530-514-470-348-327-324-318-346-333-314-321-327-315-326-326-320-332-322NA-320-321-277NA-314-534-323NA-317-294-125NA-134-136-131
us-gaap:IncomeTaxExpenseBenefit █████▇▇▇█▁▇▇█▇███████▇███1191261081311384757-55121-1063472314432971211449212491131-31111130128NA40125207NA15249131NA9463127NA140149160
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 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▇▇▇▇▁▅▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇314223302371-6165-24122722921151117921716342152196236338205143192188188193203NANANA298NANANA200NANANA211NANANA252
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:StatementClassOfStock us-gaap:CommonClassA314NA302371-6165NA272292115NA9217163NA152196236NA205143NANANANANANANANANANANANANANANANANANANANANA
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
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us-gaap:StockholdersEquity ▃▃▃▃▃▆████▃▃▃▃▃▃▃▃▃▄▄▄▄▅▅▅▅▅▆▆▆▆▇▇▇▇▁▁▁132911347013674136921354319828228032298923443234911296013086133061339913892139851403614060142501458714765150231644516598167981719116714184001885619289201972031120638208272197621654965896479606NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▇▇▇███████▄▄▄▅▅▅▅▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▆▆▆▆▁▁▁216342187422101223422257522852233992336023316233141437014637147331497015121152051518415178154601589616059163241653216671168741734317954182911869119079190521899918950189011885418236620061816094NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▇▇▇▆▆▆▆▇▆▆▄▄██▄▄▄▄▅▅▅▅▆▅▆▆▆▅▆▅▆▆█▅▆█▁▁46904768458938783820382041144451418341942694290849685162272827912926265033503305346835764018359837483907381236483875361338333847488235233808500711401143NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▅▆▅▂▂▂▂▃▂▂▁▂▁▁▁▁▂▁▂▁▁▁▃▁▁▁▁▁▂▁▁▁▅▁▄█▁▁▁▁▁156416901404410441488390700501551160342214222140191438126355155155128734181219168266214476211194281153012811232546269172243186206
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ███▇▇▇▇▇▇▆▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▂▂▂▂▂▁▁▁298142934628760280972738526859264932587225116243522371823161226262215522464218692126620716201821955318917182851764716969163541566115059144271374613054122751156910893101419316857178687574NANANA
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
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us-gaap:TaxesPayableCurrent ▃▂▄▃▄▂▄▃▄▃▃▁▆▁▂▇▆▂█▅▅▂▃▂▄▂354311388374386337409344390370357290460301330505458318535423418309372342410339NANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent ▁▁▁█416416419488NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▅▆▅▅▄▅▆▅▇▅▃▃▂▃▄▄▄▃▄▃▄▃▃▃▄██▄▄▃▄▄▄▃▃▃▁▁369386318337297357374358428344216238177213255272302220268225259210224208255514498259274234254269279250252234109121NANANA
us-gaap:ContractWithCustomerLiabilityCurrent ▂▃▂▄▄▃█▁788804798852841832983750NA892NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DebtAndCapitalLeaseObligations ▇▇▇▇▇▇████▃▃▁▁▁▁▁▁▁▁▁▁▂▂▂▂▁▁▁▁346103469435125347883549036061365273731537377377262497825077199761999319718196162002520225204142035320456206712115120959209402096620582205852078820605NANANA21836NA21344NA7328NANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations ▇▆▇▇▇▇▇███▃▃▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▁▁▂▂▂▂▂334813239433381331933485835409357493687836940372832485424881181801818518184181651950818722185041883420254201211998219771198142018120391202831959519400195081968220667213562114219734NA7316NANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent ▄▄▂▃▃▃▃▅▆▆▆▆▇▇▆▇▇▇▇███▁▂▂▂45164594414042134265431943924884508551785183536254485527522853905445551155345696575558083761392440124049NANANA5844NANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ███▇▇▇▇▇▆▆▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▁27922766268326222547264226392667236223891145112311111086110611111106113811771229124612471252126812121204NANANA1248NANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▂▃█1316134213511467NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▃▃▃▃▃▆████▃▃▃▃▃▃▃▃▃▄▄▄▄▅▅▅▅▅▆▆▆▆▇▇▇▇▁▁▁132911347013674136921354319828228032298923443234911296013086133061339913892139851403614060142501458714765150231644516598167981719116714184001885619289201972031120638208272197621654965896479606NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▇▇▇███████▄▄▄▅▅▅▅▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▆▆▆▆▁▁▁216342187422101223422257522852233992336023316233141437014637147331497015121152051518415178154601589616059163241653216671168741734317954182911869119079190521899918950189011885418236620061816094NANA
us-gaap:CommonStockValue ██████████▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄▁▁1098109010901090109010801081107910791069550550549547547546546544554563566569571571575584593604616626623622621619617602305304NANANA
us-gaap:AdditionalPaidInCapital ▇▇▇███████▄▄▄▅▅▅▅▅▅▅▅▅▅▅▅▆▆▆▆▆▆▆▆▆▆▆▁▁21634218742210122342225752285223399233602331623314143701463714733149701512115205151841517815460158961605916324165321667116874173431795418291186911907919052189991895018901188541823661946174NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▂▂▁▁▁▅▆▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▇▇▇▇▇▇▇████-6486-6814-7018-7321-7693-164377710401336110334-51110-1791152132721778714114713113514466-17311931244128515061688206723192663295832913302NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▂▂▂▂▂▂▂▃▃▃▃▃▃▄▄▄▄▄▃▃▃▆▆▆▆▄▄▄▄▆▆▆▆████-2955000000.0-2680000000.0-2499000000.0-2419000000.0-2429000000.0-2461000000.0-2454000000.0-2490000000.0-2288000000.0-1995000000.0-1994000000.0-2050000000.0-2086000000.0-2117000000.0-1855000000.0-1881000000.0-1907000000.0-1934000000.0-1941000000.0-1959000000.0-2001000000.0-2017000000.0-789000000.0-779000000.0-795000000.0-802000000.0-1660000000.0-1688000000.0-1695000000.0-1701000000.0-984000000.0-998000000.0-1000000000.0-1012000000.0-158000000.0-141000000.0-138957000.0-141153000.0NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▇▇▅▁█▆▄▅▁1299190918881701118219961787158216671178NANANANANANANANANANANANANANANANANANANANANANANANANANA669NANANA461
us-gaap:NetCashProvidedByUsedInInvestingActivities █████████▁-939000000.0-899000000.0-954000000.0-811000000.0-906000000.0-882000000.0-684000000.0-744000000.0-768000000.0-8021000000.0NANANANANANANANANANANANANANANANANANANANANANANANANANA-208162000.0NANANA-168486000.0
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▅▂▄▂▁▃▂█-486-72457-924-320-1016-1415-643-9491266NANANANANANANANANANANANANANANANANANANANANANANANANANA-364NANANA-248
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▇▇▅▁█▆▄▅▁1299190918881701118219961787158216671178NANANANANANANANANANANANANANANANANANANANANANANANANANA669NANANA461
us-gaap:NetIncomeLoss ▇▇▇▇▁▅▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇314223302371-6165-24122722921151117921716342152196236338205143192188188193203239-104526929823327074200109140102211225232238252
 us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedDefinedBenefitPlansAdjustment█████▇▇▁▁44464344443437-37-35NA38-32-33NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▇▇▇▇▁▅▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇314223302371-6165-24122722921151117921716342152196236338205143192188188193203NANANA298NANANA200NANANA211NANANA252
us-gaap:DepreciationDepletionAndAmortization ▆▇▇▆▆████▆▂▂▁▂▃▃▃▄▄▄▄▅▅▅▅116012101235119611881262128512901283119791094988095899598797610531048104810401131109710931107NANANA1117NANANA1208NANANA368NANANA353
us-gaap:DeferredIncomeTaxExpenseBenefit ▇▇▇▇▇▆▇█▇▁▅▅▆▆▆▆▆█▆▆▆▆▇▇▇105901061181263686277123-688-117-89-37-26111011257401637-1093102106NANANA166NANANA115NANANA39NANANA-15
us-gaap:ShareBasedCompensation █▅▄▅▃▄▅▆▄▅▂▂▂▂▂▂▁▁▁▂▁▁▂▂▁69483843334249544147212221202022181619201817202319NANANANANANANANANANANA9NANANA7
 us-gaap:ShareBasedCompensation us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems█▄▂▃▁▃▄▅▃694838433342495441NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities █████████▁-939000000.0-899000000.0-954000000.0-811000000.0-906000000.0-882000000.0-684000000.0-744000000.0-768000000.0-8021000000.0NANANANANANANANANANANANANANANANANANANANANANANANANANA-208162000.0NANANA-168486000.0
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▅▂▄▂▁▃▂█-486-72457-924-320-1016-1415-643-9491266NANANANANANANANANANANANANANANANANANANANANANANANANANA-364NANANA-248
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▂▄▂▁▁▁▁▁▁▃▁█▁▁▂▂▁▁▁▁▂▁▂▁▁123727199880000013017900660800946988227-13960594048300NANANA988NANANA2032NANANANANANANANA
us-gaap:RepaymentsOfLongTermDebt ▇█▃▃▁▂▅▁▁▂▁▅▁▁▃▅▁▂▁▁▂▃▁▁▁▃▁▃▁248826986996071533971416556835182149931269721439254312912038663841744784115196256NANANANANANANANANANANANA
us-gaap:PaymentsOfDividends ▁▁▁▁▁█████▁▂▂▁▁▂▁▂▂▂▂▂▂▂▂291271275269285577579576580572291294296291290296290293296305304304308307309NANANA341NANANA452NANANA221NANANA218
us-gaap:PaymentsOfDividends ▁▁▁▁▁█████▁▂▂▁▁▂▁▂▂▂▂▂▂▂▂291271275269285577579576580572291294296291290296290293296305304304308307309NANANA341NANANA452NANANA221NANANA218
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:RepaymentsOfLongTermDebt ▇█▃▃▁▂▅▁▁▂▁▅▁▁▃▅▁▂▁▁▂▃▁▁▁▃▁▃▁248826986996071533971416556835182149931269721439254312912038663841744784115196256NANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1098109010901090109010801081107910791069550550549547547546546544554563566569571571575584593604616626623622621619617602305304
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.71.71.71.71.51.51.51.41.41.11.11.21.21.21.21.11.11.11.11.11.11.11.11.11.11.11.11.11.21.11.11.11.11.11.11.41.4

Common Stock Par Or Stated Value Per Share

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



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
Value1097109010901090109010801080107810781069549549548546546545546543554562565568570571575583593604615625623622621618617601305304
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1097109010901090109010801080107810781069549549548546546545546543554562565568570571575583593604615625623622621618617601305304
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized



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
Value22001600220022001600160016001600160016001600160016001600160016001600160016001600160016001600160016001600160016001600160016001600800800800800800800
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value108110741072106810721068106954154254154054054055555956356756957559460562162362162061360003013000
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value1081107410721068107210681069541542541540540540555559563
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value107510721071106810661064106554154154053953953855455856156556757459460461962161961861259803003000
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value1075107210711068106610641065541541540539539538554558561
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.290.210.280.35-5.77-2.260.250.270.111.260.170.030.30.080.280.360.440.620.370.260.340.330.330.340.350.41-1.760.450.480.370.430.120.320.180.230.170.690.740.760.790.84
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value0.290.280.35-5.770.250.270.110.170.030.30.280.360.440.370.260.34
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.290.210.280.35-5.77-2.260.250.270.111.260.170.030.30.080.280.360.440.620.370.260.340.330.330.340.350.41-1.760.440.480.370.430.120.320.180.230.170.690.740.760.790.84
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value0.290.280.35-5.770.250.270.110.170.030.30.280.360.440.370.260.34
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value47475570525152225289577855065577563353234034409042094289438243984401447645544419445144384514454145384542451545254513458345714612461046534596440616951722174817721800
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues90.8100.093.793.693.7100.094.694.594.8100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value52285570560655785647577855065577594553234034409042094289438243984401447645544419445144384514454145384542451545254513458345714612461046534596440616951722174817721800
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.094.694.5100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value52285570560655785647577858185902594553234034409042094289438243984401447645544419445144384514454145384542451545254513458345714612461046534596440616951722174817721800
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsForChangeInAccountingPrinciple

ctl:ChangeinAccountingPrincipleUniversalServiceFund



Period End2020-03-312019-03-31
Value-215-220
Percentage of Revenues-4.1-3.9
Percentage of Revenues-4.1-3.9
Percentage of Revenues ctl:ChangeinAccountingPrincipleUniversalServiceFund100.0100.0

us-gaap:ConsolidationItems

us-gaap:OperatingSegments



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
Value5228557056065578564763245640571757625674384539074037
Percentage of Revenues100.0100.0100.0100.0100.0109.496.996.996.9106.695.395.595.9
Percentage of Revenues100.0100.0100.0100.0100.0109.496.996.996.9106.695.395.595.9
Percentage of Revenues us-gaap:OperatingSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:ProductOrService

us-gaap:OperatingSegments, ctl:Broadband



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value722718718718722703702705712
Percentage of Revenues13.812.912.812.912.812.212.111.912.0
Percentage of Revenues13.812.912.812.912.812.212.111.912.0
Percentage of Revenues us-gaap:OperatingSegments ctl:Broadband100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:IPDataServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value162417611760173017491756172417461735
Percentage of Revenues31.131.631.431.031.030.429.629.629.2
Percentage of Revenues31.131.631.431.031.030.429.629.629.2
Percentage of Revenues us-gaap:OperatingSegments ctl:IPDataServices100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:ITManagedServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value125130126135144146154162162
Percentage of Revenues2.42.32.22.42.62.52.62.72.7
Percentage of Revenues2.42.32.22.42.62.52.62.72.7
Percentage of Revenues us-gaap:OperatingSegments ctl:ITManagedServices100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:RegulatoryRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value156160157158159180181185183
Percentage of Revenues3.02.92.82.82.83.13.13.13.1
Percentage of Revenues3.02.92.82.82.83.13.13.13.1
Percentage of Revenues us-gaap:OperatingSegments ctl:RegulatoryRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:TransportInfrastructure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value123213131309129112901356134513641368
Percentage of Revenues23.623.623.323.122.823.523.123.123.0
Percentage of Revenues23.623.623.323.122.823.523.123.123.0
Percentage of Revenues us-gaap:OperatingSegments ctl:TransportInfrastructure100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:Voice



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value421453462477489505565546557
Percentage of Revenues8.18.18.28.68.78.79.79.39.4
Percentage of Revenues8.18.18.28.68.78.79.79.39.4
Percentage of Revenues us-gaap:OperatingSegments ctl:Voice100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:VoiceCollaboration



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9209801013100510231053105610891111
Percentage of Revenues17.617.618.118.018.118.218.218.518.7
Percentage of Revenues17.617.618.118.018.118.218.218.518.7
Percentage of Revenues us-gaap:OperatingSegments ctl:VoiceCollaboration100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:ProductAndServiceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value28556164717991105117
Percentage of Revenues0.51.01.11.11.31.41.61.82.0
Percentage of Revenues0.51.01.11.11.31.41.61.82.0
Percentage of Revenues us-gaap:OperatingSegments us-gaap:ProductAndServiceOther100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ctl:Broadband, ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value722718718718722703702705712
Percentage of Revenues13.812.912.812.912.812.212.111.912.0
Percentage of Revenues13.812.912.812.912.812.212.111.912.0
Percentage of Revenues us-gaap:OperatingSegments ctl:Broadband ctl:Consumer100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:IPDataServices, ctl:Consumer



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
Value00000597085979398107120
Percentage of Revenues0.00.00.00.00.01.01.21.41.61.72.42.62.9
Percentage of Revenues0.00.00.00.00.01.01.21.41.61.72.42.62.9
Percentage of Revenues us-gaap:OperatingSegments ctl:IPDataServices ctl:Consumer0.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:IPDataServices, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value628703691681688682659667665
Percentage of Revenues12.012.612.312.212.211.811.311.311.2
Percentage of Revenues12.012.612.312.212.211.811.311.311.2
Percentage of Revenues us-gaap:OperatingSegments ctl:IPDataServices ctl:Enterprise100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:IPDataServices, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value400419417420420434423431440
Percentage of Revenues7.77.57.47.57.47.57.37.37.4
Percentage of Revenues7.77.57.47.57.47.57.37.37.4
Percentage of Revenues us-gaap:OperatingSegments ctl:IPDataServices ctl:InternationalandGlobalAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:IPDataServices, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value269299295290300294294299291
Percentage of Revenues5.15.45.35.25.35.15.15.14.9
Percentage of Revenues5.15.45.35.25.35.15.15.14.9
Percentage of Revenues us-gaap:OperatingSegments ctl:IPDataServices ctl:SmallandMediumBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:IPDataServices, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value327340357339341346348349339
Percentage of Revenues6.36.16.46.16.06.06.05.95.7
Percentage of Revenues6.36.16.46.16.06.06.05.95.7
Percentage of Revenues us-gaap:OperatingSegments ctl:IPDataServices ctl:Wholesale100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:ITManagedServices, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value565959667476777773
Percentage of Revenues1.11.11.11.21.31.31.31.31.2
Percentage of Revenues1.11.11.11.21.31.31.31.31.2
Percentage of Revenues us-gaap:OperatingSegments ctl:ITManagedServices ctl:Enterprise100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:ITManagedServices, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value585855555758626973
Percentage of Revenues1.11.01.01.01.01.01.11.21.2
Percentage of Revenues1.11.01.01.01.01.01.11.21.2
Percentage of Revenues us-gaap:OperatingSegments ctl:ITManagedServices ctl:InternationalandGlobalAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:ITManagedServices, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value101111121211131414
Percentage of Revenues0.20.20.20.20.20.20.20.20.2
Percentage of Revenues0.20.20.20.20.20.20.20.20.2
Percentage of Revenues us-gaap:OperatingSegments ctl:ITManagedServices ctl:SmallandMediumBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:ITManagedServices, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value121211222
Percentage of Revenues0.00.00.00.00.00.00.00.00.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:OperatingSegments ctl:ITManagedServices ctl:Wholesale100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:RegulatoryRevenue, ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value156160157158159180181185183
Percentage of Revenues3.02.92.82.82.83.13.13.13.1
Percentage of Revenues3.02.92.82.82.83.13.13.13.1
Percentage of Revenues us-gaap:OperatingSegments ctl:RegulatoryRevenue ctl:Consumer100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:TransportInfrastructure, ctl:Consumer



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
Value00000721720722756713697683701
Percentage of Revenues0.00.00.00.00.012.512.412.212.713.417.316.716.7
Percentage of Revenues0.00.00.00.00.012.512.412.212.713.417.316.716.7
Percentage of Revenues us-gaap:OperatingSegments ctl:TransportInfrastructure ctl:Consumer0.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:TransportInfrastructure, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value380408405368364396374381399
Percentage of Revenues7.37.37.26.66.46.96.46.56.7
Percentage of Revenues7.37.37.26.66.46.96.46.56.7
Percentage of Revenues us-gaap:OperatingSegments ctl:TransportInfrastructure ctl:Enterprise100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:TransportInfrastructure, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value316334331333320329317309321
Percentage of Revenues6.06.05.96.05.75.75.45.25.4
Percentage of Revenues6.06.05.96.05.75.75.45.25.4
Percentage of Revenues us-gaap:OperatingSegments ctl:TransportInfrastructure ctl:InternationalandGlobalAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:TransportInfrastructure, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value89101106106107109117135110
Percentage of Revenues1.71.81.91.91.91.92.02.31.9
Percentage of Revenues1.71.81.91.91.91.92.02.31.9
Percentage of Revenues us-gaap:OperatingSegments ctl:TransportInfrastructure ctl:SmallandMediumBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:TransportInfrastructure, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value447470467484499522537539538
Percentage of Revenues8.68.48.38.78.89.09.29.19.0
Percentage of Revenues8.68.48.38.78.89.09.29.19.0
Percentage of Revenues us-gaap:OperatingSegments ctl:TransportInfrastructure ctl:Wholesale100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:Voice, ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value421453462477489505565546557
Percentage of Revenues8.18.18.28.68.78.79.79.39.4
Percentage of Revenues8.18.18.28.68.78.79.79.39.4
Percentage of Revenues us-gaap:OperatingSegments ctl:Voice ctl:Consumer100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:VoiceCollaboration, ctl:Consumer



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
Value00000505565545526594625647626
Percentage of Revenues0.00.00.00.00.08.79.79.28.811.215.515.814.9
Percentage of Revenues0.00.00.00.00.08.79.79.28.811.215.515.814.9
Percentage of Revenues us-gaap:OperatingSegments ctl:VoiceCollaboration ctl:Consumer0.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:VoiceCollaboration, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value356385395390397404395398410
Percentage of Revenues6.86.97.07.07.07.06.86.76.9
Percentage of Revenues6.86.97.07.07.07.06.86.76.9
Percentage of Revenues us-gaap:OperatingSegments ctl:VoiceCollaboration ctl:Enterprise100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:VoiceCollaboration, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value91939694941029094101
Percentage of Revenues1.71.71.71.71.71.81.51.61.7
Percentage of Revenues1.71.71.71.71.71.81.51.61.7
Percentage of Revenues us-gaap:OperatingSegments ctl:VoiceCollaboration ctl:InternationalandGlobalAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:VoiceCollaboration, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value290320322328336342361371369
Percentage of Revenues5.55.75.75.96.05.96.26.36.2
Percentage of Revenues5.55.75.75.96.05.96.26.36.2
Percentage of Revenues us-gaap:OperatingSegments ctl:VoiceCollaboration ctl:SmallandMediumBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:VoiceCollaboration, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value183182200193196205210226231
Percentage of Revenues3.53.33.63.53.53.53.63.83.9
Percentage of Revenues3.53.33.63.53.53.53.63.83.9
Percentage of Revenues us-gaap:OperatingSegments ctl:VoiceCollaboration ctl:Wholesale100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:ProductAndServiceOther, ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value28556164717991105117
Percentage of Revenues0.51.01.11.11.31.41.61.82.0
Percentage of Revenues0.51.01.11.11.31.41.61.82.0
Percentage of Revenues us-gaap:OperatingSegments us-gaap:ProductAndServiceOther ctl:Consumer100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ctl:Consumer



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
Value1327138613981417144112851355135213791400142014371447
Percentage of Revenues25.424.924.925.425.522.223.322.923.226.335.235.134.4
Percentage of Revenues25.424.924.925.425.522.223.322.923.226.335.235.134.4
Percentage of Revenues us-gaap:OperatingSegments ctl:Consumer100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value142015551550150515231558150515231547
Percentage of Revenues27.227.927.627.027.027.025.925.826.0
Percentage of Revenues27.227.927.627.027.027.025.925.826.0
Percentage of Revenues us-gaap:OperatingSegments ctl:Enterprise100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value865904899902891923892903935
Percentage of Revenues16.516.216.016.215.816.015.315.315.7
Percentage of Revenues16.516.216.016.215.816.015.315.315.7
Percentage of Revenues us-gaap:OperatingSegments ctl:InternationalandGlobalAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value658731734736755756785819784
Percentage of Revenues12.613.113.113.213.413.113.513.913.2
Percentage of Revenues12.613.113.113.213.413.113.513.913.2
Percentage of Revenues us-gaap:OperatingSegments ctl:SmallandMediumBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9589941025101810371074109711161110
Percentage of Revenues18.317.818.318.318.418.618.918.918.7
Percentage of Revenues18.317.818.318.318.418.618.918.918.7
Percentage of Revenues us-gaap:OperatingSegments ctl:Wholesale100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

ctl:Broadband



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value722718718718722703702705712
Percentage of Revenues13.812.912.812.912.812.212.111.912.0
Percentage of Revenues13.812.912.812.912.812.212.111.912.0
Percentage of Revenues ctl:Broadband100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:IPDataServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value162417611760173017491756172417461735
Percentage of Revenues31.131.631.431.031.030.429.629.629.2
Percentage of Revenues31.131.631.431.031.030.429.629.629.2
Percentage of Revenues ctl:IPDataServices100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:ITManagedServices



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value125130126135144146154162162
Percentage of Revenues2.42.32.22.42.62.52.62.72.7
Percentage of Revenues2.42.32.22.42.62.52.62.72.7
Percentage of Revenues ctl:ITManagedServices100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:RegulatoryRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value156160157158159180181185183
Percentage of Revenues3.02.92.82.82.83.13.13.13.1
Percentage of Revenues3.02.92.82.82.83.13.13.13.1
Percentage of Revenues ctl:RegulatoryRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:TransportInfrastructure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value123213131309129112901356134513641368
Percentage of Revenues23.623.623.323.122.823.523.123.123.0
Percentage of Revenues23.623.623.323.122.823.523.123.123.0
Percentage of Revenues ctl:TransportInfrastructure100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:Voice



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value421453462477489505565546557
Percentage of Revenues8.18.18.28.68.78.79.79.39.4
Percentage of Revenues8.18.18.28.68.78.79.79.39.4
Percentage of Revenues ctl:Voice100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:VoiceCollaboration



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9209801013100510231053105610891111
Percentage of Revenues17.617.618.118.018.118.218.218.518.7
Percentage of Revenues17.617.618.118.018.118.218.218.518.7
Percentage of Revenues ctl:VoiceCollaboration100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductAndServiceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value28556164717991105117
Percentage of Revenues0.51.01.11.11.31.41.61.82.0
Percentage of Revenues0.51.01.11.11.31.41.61.82.0
Percentage of Revenues us-gaap:ProductAndServiceOther100.0100.0100.0100.0100.0100.0100.0100.0100.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value223525212590244625202657267227302803249819271890188819291996194919001915199319591911197419751962193519181873179619431912187719501781594641627619
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues42.845.346.243.944.646.045.946.347.146.947.846.244.945.045.544.343.242.843.844.342.944.543.843.242.642.541.439.842.541.540.742.440.435.136.735.434.4

us-gaap:AdjustmentsForChangeInAccountingPrinciple

ctl:ChangeinAccountingPrincipleUniversalServiceFund



Period End2020-03-312019-03-31
Value-215-220
Percentage of CostOfGoodsAndServicesSold-9.6-8.7
Percentage of Revenues-4.1-3.9
Percentage of Revenues ctl:ChangeinAccountingPrincipleUniversalServiceFund100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value127813551398132213841450150015291530
Percentage of CostOfGoodsAndServicesSold57.253.754.054.054.954.656.156.054.6
Percentage of Revenues24.424.324.923.724.525.125.825.925.7
Percentage of Revenues us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value95711661192112411361207117212011273
Percentage of CostOfGoodsAndServicesSold42.846.346.046.045.145.443.944.045.4
Percentage of Revenues18.320.921.320.220.120.920.120.321.4
Percentage of Revenues us-gaap:OperatingSegments18.320.921.320.220.119.120.821.022.1

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4269807787103115124158
Percentage of CostOfGoodsAndServicesSold1.92.73.13.13.53.94.34.55.6
Percentage of Revenues0.81.21.41.41.51.82.02.12.7
Percentage of Revenues us-gaap:OperatingSegments ctl:Consumer3.25.05.75.46.08.08.59.211.5

us-gaap:OperatingSegments, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value447551544497496533491500514
Percentage of CostOfGoodsAndServicesSold20.021.921.020.319.720.118.418.318.3
Percentage of Revenues8.69.99.78.98.89.28.48.58.6
Percentage of Revenues us-gaap:OperatingSegments ctl:Enterprise31.535.435.133.032.634.232.632.833.2

us-gaap:OperatingSegments, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value233258269258259267254263272
Percentage of CostOfGoodsAndServicesSold10.410.210.410.510.310.09.59.69.7
Percentage of Revenues4.54.64.84.64.64.64.44.54.6
Percentage of Revenues us-gaap:OperatingSegments ctl:InternationalandGlobalAccounts26.928.529.928.629.128.928.529.129.1

us-gaap:OperatingSegments, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value104151155147153160154147153
Percentage of CostOfGoodsAndServicesSold4.76.06.06.06.16.05.85.45.5
Percentage of Revenues2.02.72.82.62.72.82.62.52.6
Percentage of Revenues us-gaap:OperatingSegments ctl:SmallandMediumBusiness15.820.721.120.020.321.219.617.919.5

us-gaap:OperatingSegments, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value131137144145141144158167176
Percentage of CostOfGoodsAndServicesSold5.95.45.65.95.65.45.96.16.3
Percentage of Revenues2.52.52.62.62.52.52.72.83.0
Percentage of Revenues us-gaap:OperatingSegments ctl:Wholesale13.713.814.014.213.613.414.415.015.9

Operating Expenses

Operating Costs And Expenses

Costs And Expenses

us-gaap:CostsAndExpenses



Period End2020-03-312019-03-31
Value424810926
Percentage of CostsAndExpenses100.0100.0
Percentage of Revenues81.3193.5

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value85399283196093297496711151109110471088481010107968128317578578638518508238318431047814818748835871870968268243264282
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues16.317.814.817.216.516.916.618.918.720.717.621.619.223.518.218.518.916.918.819.519.119.218.218.318.623.218.018.116.418.118.918.922.015.813.914.915.7

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value410570397498454515493611603839592620-680591687680-689693637676-682632876
Percentage of SellingGeneralAndAdministrativeExpense48.157.547.851.948.752.951.054.854.483.174.476.4-81.878.180.278.8-81.081.577.481.3-80.90.083.7
Percentage of Revenues7.810.27.18.98.08.98.510.410.119.613.514.1-15.513.215.115.4-15.515.614.114.9-15.013.919.4
Percentage of Revenues us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value443422434462478459474504506
Percentage of SellingGeneralAndAdministrativeExpense51.942.552.248.151.347.149.045.245.6
Percentage of Revenues8.57.67.78.38.57.98.18.58.5
Percentage of Revenues us-gaap:OperatingSegments8.57.67.78.38.57.38.48.88.8

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11594102110109116124136135
Percentage of SellingGeneralAndAdministrativeExpense13.59.512.311.511.711.912.812.212.2
Percentage of Revenues2.21.71.82.01.92.02.12.32.3
Percentage of Revenues us-gaap:OperatingSegments ctl:Consumer8.76.87.37.87.69.09.210.19.8

us-gaap:OperatingSegments, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value136129134143149135141145152
Percentage of SellingGeneralAndAdministrativeExpense15.913.016.114.916.013.914.613.013.7
Percentage of Revenues2.62.32.42.62.62.32.42.52.6
Percentage of Revenues us-gaap:OperatingSegments ctl:Enterprise9.68.38.69.59.88.79.49.59.8

us-gaap:OperatingSegments, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value656565686862626468
Percentage of SellingGeneralAndAdministrativeExpense7.66.67.87.17.36.46.45.76.1
Percentage of Revenues1.21.21.21.21.21.11.11.11.1
Percentage of Revenues us-gaap:OperatingSegments ctl:InternationalandGlobalAccounts7.57.27.27.57.66.77.07.17.3

us-gaap:OperatingSegments, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value110116112120132125129136127
Percentage of SellingGeneralAndAdministrativeExpense12.911.713.512.514.212.813.312.211.5
Percentage of Revenues2.12.12.02.22.32.22.22.32.1
Percentage of Revenues us-gaap:OperatingSegments ctl:SmallandMediumBusiness16.715.915.316.317.516.516.416.616.2

us-gaap:OperatingSegments, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value171821212021182324
Percentage of SellingGeneralAndAdministrativeExpense2.01.82.52.22.12.21.92.12.2
Percentage of Revenues0.30.30.40.40.40.40.30.40.4
Percentage of Revenues us-gaap:OperatingSegments ctl:Wholesale1.81.82.02.11.92.01.62.12.2

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value980847950976-5499-1841894767750524487367631392595650694751656549649483619655653641-685715782666736657654533551459464486506523545
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues18.715.216.917.5-97.4-31.915.413.012.69.812.19.015.09.113.614.815.816.814.412.414.610.913.714.414.414.1-15.215.817.314.516.114.214.211.512.010.427.428.228.929.530.3

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value449484496518523539557546535481362320318320327340331328329327328330325325331329325316326335343324280131138140142
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.68.78.89.39.39.39.69.39.09.09.07.87.67.57.57.77.57.37.27.47.47.47.27.27.37.37.27.07.17.37.47.06.47.87.97.97.9

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-31
Value-5
Percentage of InterestExpense-1.1
Percentage of Revenues-0.1
Percentage of Revenues us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.0

Interest Expense Debt

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-98-14-4444-5-192516211114-7-62-197177212245-799439123207-1464410
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-1.9-0.3-0.80.8-0.1-0.30.40.30.40.20.3-0.2-0.10.0-0.40.20.40.20.00.30.00.10.1-0.20.20.20.10.90.30.10.40.2-0.30.40.20.20.6

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-06-302016-03-31
Value1132233-3-333333
Percentage of OtherNonoperatingIncomeExpense-1.0-7.1-6.84.5-40.0-15.812.0-18.8-14.321.4-42.9-50.042.917.6
Percentage of Revenues0.00.00.10.00.00.10.1-0.1-0.10.10.10.10.10.1
Percentage of Revenues us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-06-302016-03-31
Value50575456574345-46-445152514542
Percentage of OtherNonoperatingIncomeExpense-51.0-407.1-122.7127.3-1140.0-226.3180.0-287.5-209.5364.3-742.9-850.0642.9247.1
Percentage of Revenues1.01.01.01.01.00.70.8-0.8-0.71.31.31.21.01.0
Percentage of Revenues us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Gains Losses On Extinguishment Of Debt

us-gaap:LongtermDebtType

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:SeniorNotes



Period End2020-03-31
Value79
Percentage of GainsLossesOnExtinguishmentOfDebt100.0
Percentage of Revenues1.5
Percentage of Revenues us-gaap:SeniorNotes0.0

Income Loss From Continuing Operations

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value433349410502-6027-2365329237236541394030774249317380430329234323157299323331330-1005
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.36.37.39.0-106.7-40.95.74.04.01.03.41.07.31.75.77.28.69.67.25.37.33.56.67.17.37.3-22.3

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value56605758594648-49-4754-55-54
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest12.917.213.911.6-1.0-1.914.6-20.7-19.938.8-137.5-17.6
Percentage of Revenues1.11.11.01.01.00.80.8-0.8-0.81.3-1.3-1.3
Percentage of Revenues us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-547-498-540-474-528-524-565-530-514-470-348-327-324-318-346-333-314-321-327-315-326-326-320-332-322-320-321-277-314-534-323-317-294-125-134-136-131
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-10.5-8.9-9.6-8.5-9.4-9.1-9.7-9.0-8.6-8.8-8.6-8.0-7.7-7.4-7.9-7.6-7.1-7.2-7.2-7.1-7.3-7.3-7.1-7.3-7.1-7.1-7.1-6.1-6.9-11.6-7.0-6.9-6.7-7.4-7.7-7.7-7.3

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



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
Value-547-498-540-474-528-524-565-530-514-470-348-327-324-318-346-333-314-321-327-315-326-326-320-332-322-311-320
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0
Percentage of Revenues-10.5-8.9-9.6-8.5-9.4-9.1-9.7-9.0-8.6-8.8-8.6-8.0-7.7-7.4-7.9-7.6-7.1-7.2-7.2-7.1-7.3-7.3-7.1-7.3-7.1-6.8-7.1
Percentage of Revenues us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1191261081311384757-55121-1063472314432971211449212491131-3111113012840125207152491319463127140149160
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.32.31.92.32.40.81.0-0.92.0-20.01.20.63.40.72.22.83.32.12.72.12.9-0.72.52.92.80.92.84.63.31.12.82.01.47.58.08.48.9

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value12141414151211-12-1216-23-21
Percentage of IncomeTaxExpenseBenefit10.111.113.010.710.925.519.321.8-9.934.0-100.0-14.6
Percentage of Revenues0.20.30.20.30.30.20.2-0.2-0.20.4-0.6-0.5
Percentage of Revenues us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value620-761570-382-294214118265-55332310119133656-213108-142
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.10.4-1.40.30.10.0-6.6-5.00.00.32.96.5-0.11.27.40.20.20.20.30.80.10.1-0.00.30.20.2-0.00.30.2

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax



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
Value-239117-112-85-40-1-2397911184-2-12-4-4-1-4-1011-11-7-16
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-4.62.1-2.0-0.10.1-0.7-0.0-4.01.30.20.40.1-0.0-0.3-0.1-0.1-0.0-0.1-0.20.2-0.2-0.2-0.4

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value3942222381-6133-241930890229111614853194-220178222263345223185208-1040178209210-101827630428476212123113213234
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.70.84.06.8-108.6-41.95.31.53.921.03.71.34.6-5.14.15.06.07.74.94.24.7-23.43.94.64.6-22.56.16.76.21.64.62.72.612.613.4

Other Comprehensive Income Loss Net Of Tax

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value314223302371-6165-24122722921151117921716342152196236338205143192188188193203239-104526929823327074200109140102211225232238252
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.04.05.46.7-109.2-41.74.74.91.921.02.30.43.91.03.54.55.47.64.53.24.34.24.24.34.55.3-23.15.96.65.15.91.64.32.33.02.312.413.113.313.414.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value44464344443437-37-3538-32-33
Percentage of NetIncomeLoss14.020.614.211.9-0.7-1.413.6-12.7-30.441.3-188.2-20.2
Percentage of Revenues0.80.80.80.80.80.60.6-0.6-0.60.9-0.8-0.8
Percentage of Revenues us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value314223302371-6165-24122722921151117921716342152196236338205143192188188193203298200211252
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.04.05.46.7-109.2-41.74.74.91.921.02.30.43.91.03.54.55.47.64.53.24.34.24.24.34.56.64.312.414.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:StatementClassOfStock

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value314302371-61652722921159217163152196236205143
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.05.46.7-109.24.74.91.92.30.43.93.54.55.44.53.2
Percentage of Revenues us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:StatementClassOfStock

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value314302371-61652722921159217163152196236205143
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.05.46.7-109.24.74.91.92.30.43.93.54.55.44.53.2
Percentage of Revenues us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value6405664742647286450864788702567337174346747937561150536509254660247017467964711847517476044875448977495205014750646506145116651787519845325453729540205463255090568425613956735548422190122038
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value6405664742647286450864788702567337174346747937561150536509254660247017467964711847517476044875448977495205014750646506145116651787519845325453729540205463255090568425613956735548422190122038
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value1329113470136741369213543198282280322989234432349112960130861330613399138921398514036140601425014587147651502316445165981679817191167141840018856192892019720311206382082721976216549658964796069467
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets20.720.821.121.220.928.231.130.931.331.125.625.728.628.529.729.729.529.529.229.829.830.032.532.832.833.232.234.635.135.737.036.936.337.138.739.544.143.80.00.0

us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-181-184-49-52-55-58-255-260-263-235-152-156-159-162-170-174-177-180
Percentage of StockholdersEquity-1.4-1.4-0.4-0.4-0.4-0.3-1.1-1.1-1.1-1.0-1.2-1.2-1.2-1.2-1.2-1.2-1.3-1.3
Percentage of Assets-0.3-0.3-0.1-0.1-0.1-0.1-0.3-0.3-0.4-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.4
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-2193-2229-2051-2091-2132-2173-2009-2041-2075-1731-1802-1836-1865-1895-1637-1663-1690-1715
Percentage of StockholdersEquity-16.5-16.5-15.0-15.3-15.7-11.0-8.8-8.9-8.9-7.4-13.9-14.0-14.0-14.1-11.8-11.9-12.0-12.2
Percentage of Assets-3.4-3.4-3.2-3.2-3.3-3.1-2.7-2.7-2.8-2.3-3.6-3.6-4.0-4.0-3.5-3.5-3.6-3.6
Percentage of Assets us-gaap:PensionPlansDefinedBenefit us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-114-39-54-43-170
Percentage of StockholdersEquity-0.9-0.3-0.4-0.3-0.10.0
Percentage of Assets-0.2-0.1-0.1-0.1-0.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-31
Value-2955-2680-2499-2419-2429-2461-2454-2490-2288-1995-1994-2050-2086-2117-1855-1881-1907-1934-1941-1959-2001-2017-789-779-795-802-1660-1688-1695-1701-984-998-1000-1012-158-141-139-141-89-85-123
Percentage of StockholdersEquity-22.2-19.9-18.3-17.7-17.9-12.4-10.8-10.8-9.8-8.5-15.4-15.7-15.7-15.8-13.4-13.5-13.6-13.8-13.6-13.4-13.6-13.4-4.8-4.7-4.7-4.7-9.9-9.2-9.0-8.8-4.9-4.9-4.8-4.9-0.7-0.7-1.4-1.5-0.9-0.90.0
Percentage of Assets-4.6-4.1-3.9-3.7-3.7-3.5-3.3-3.3-3.1-2.6-3.9-4.0-4.5-4.5-4.0-4.0-4.0-4.1-4.0-4.0-4.0-4.0-1.6-1.5-1.6-1.5-3.2-3.2-3.2-3.1-1.8-1.8-1.8-1.8-0.3-0.3-0.6-0.60.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



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-467-228-345-233-225-230-190-18950-29-40-58-62-60-48-44-40-39-25
Percentage of StockholdersEquity-3.5-1.7-2.5-1.7-1.7-1.2-0.8-0.80.2-0.1-0.3-0.4-0.5-0.4-0.3-0.3-0.3-0.3-0.2
Percentage of Assets-0.7-0.4-0.5-0.4-0.3-0.3-0.3-0.30.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-31
Value216342187422101223422257522852233992336023316233141437014637147331497015121152051518415178154601589616059163241653216671168741734317954182911869119079190521899918950189011885418236620061816094602045
Percentage of StockholdersEquity162.8162.4161.6163.2166.7115.3102.6101.699.599.2110.9111.9110.7111.7108.8108.7108.2108.0108.5109.0108.8108.7100.5100.4100.5100.9107.499.499.198.994.393.591.890.885.884.264.264.163.463.60.0
Percentage of Assets33.833.834.134.634.832.531.931.431.230.828.428.731.631.832.332.332.031.931.732.532.432.632.632.933.033.534.534.334.835.334.934.533.333.733.233.328.328.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-31
Value1098109010901090109010801081107910791069550550549547547546546544554563566569571571575584593604616626623622621619617602306305303299100
Percentage of StockholdersEquity8.38.18.08.08.05.44.74.74.64.64.24.24.14.13.93.93.93.93.93.93.83.83.53.43.43.43.53.33.33.23.13.13.03.02.82.83.23.23.23.20.0
Percentage of Assets1.71.71.71.71.71.51.51.51.41.41.11.11.21.21.21.21.11.11.11.11.11.11.11.11.11.11.11.11.11.21.11.11.11.11.11.11.41.40.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-31
Value-6486-6814-7018-7321-7693-164377710401336110334-51110-1791152132721778714114713113514466-17311931244128515061688206723192663297132913302329832333146
Percentage of StockholdersEquity-48.8-50.6-51.3-53.5-56.8-8.33.44.55.74.70.3-0.40.8-0.00.60.81.51.91.20.61.01.00.80.80.90.4-1.06.56.66.77.58.310.011.112.113.734.134.234.334.20.0
Percentage of Assets-10.1-10.5-10.8-11.3-11.9-2.31.11.41.81.50.1-0.10.2-0.00.20.20.40.60.40.20.30.30.30.30.30.1-0.32.22.32.42.83.13.64.14.75.415.015.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value46904768458938783820382041144451418341942694290849685162272827912926265033503305346835764018359837483907381236483875361338333847488235233808500711401143
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.37.47.16.05.95.45.66.05.65.55.35.710.711.05.85.96.25.66.96.77.07.17.97.17.37.57.36.97.26.77.07.08.66.36.79.15.25.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value156416901404410441488390700501551160342214222140191438126355155155128734181219168266214476211194281153012811232546269172243186206161243
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.62.20.60.70.70.50.90.70.70.30.70.50.50.30.40.90.30.70.30.30.31.40.40.40.30.50.40.90.40.40.52.70.22.04.61.20.80.00.00.00.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent



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
Value217522592290244623472398246524712432255718881868185420171957197218711943195119551973198819781986188719771911190019241917197119201879195219981830667712
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.43.53.53.83.63.43.43.33.33.43.73.74.04.34.24.23.94.14.04.04.04.03.93.93.73.83.73.63.63.53.63.53.33.53.53.33.03.2

Inventory Net

Other Assets Current

us-gaap:OtherAssetsCurrent



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
Value941808884101110269181237126011059416396915575476316286175815945996225805916286325975635705875526496284813903783485740
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.21.41.61.61.31.71.71.51.21.31.41.21.21.31.31.31.21.21.21.31.21.21.21.21.21.11.11.11.01.21.10.80.70.70.60.30.2

Property Plant And Equipment Gross

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment



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
Value298142934628760280972738526859264932587225116243522371823161226262215522464218692126620716201821955318917182851764716969163541566115059144271374613054122751156910893101419316857178687574
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.545.344.443.642.338.236.134.833.632.246.945.548.647.148.046.444.843.541.439.938.236.534.833.532.030.229.027.125.624.222.521.019.218.116.415.635.934.4

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



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
Value25956260792587425860257932640826168264942682626852176341758317016170391784017894179631806918068180891818318433183231843518493186461866518777188251903219013190541929519436192901802486488754
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.540.340.040.139.837.635.735.635.935.534.934.536.536.238.138.037.838.037.136.936.736.836.236.436.136.035.935.335.035.234.834.633.934.634.032.939.539.7

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-01-312013-01-032012-12-312012-09-302012-06-302012-04-022012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value2147321534215072152721526280313077030715307783047519638196391965019650207662076620743207422075720758207532075520664206742067420674206372174421733216272173221732217322173221732217262172421702202661026010260
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.533.333.233.433.239.941.941.341.240.338.938.642.241.844.444.143.743.642.642.441.941.440.840.840.439.939.740.840.40.00.040.239.839.40.038.238.738.337.046.846.6

us-gaap:StatementBusinessSegments

ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312013-01-03
Value7054705470547054705475841027810278102781027810278102781034810348
Percentage of Goodwill32.932.832.832.832.827.133.433.533.752.349.649.550.147.6
Percentage of Assets11.010.910.910.910.910.814.013.813.621.921.620.520.00.0
Percentage of Assets ctl:Consumer0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value473847384738473847385222
Percentage of Goodwill22.122.022.022.022.018.6
Percentage of Assets7.47.37.37.37.37.4
Percentage of Assets ctl:Enterprise0.00.00.00.00.00.0

ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value260926702643266326623595
Percentage of Goodwill12.212.412.312.412.412.8
Percentage of Assets4.14.14.14.14.15.1
Percentage of Assets ctl:InternationalandGlobalAccounts0.00.00.00.00.00.0

ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value325932593259325932595193
Percentage of Goodwill15.215.115.215.115.118.5
Percentage of Assets5.15.05.05.15.07.4
Percentage of Assets ctl:SmallandMediumBusiness0.00.00.00.00.00.0

ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312015-12-312014-12-312013-12-312013-01-032012-12-31
Value38133813381338133813643700327432743274
Percentage of Goodwill17.817.717.717.717.723.00.00.015.815.115.1
Percentage of Assets6.05.95.95.95.99.20.00.06.30.06.1
Percentage of Assets ctl:Wholesale0.00.00.00.00.00.00.00.00.00.00.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value724575967902824585808911930910876
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.311.712.212.813.212.712.714.4

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

ctl:TradeNamesandPatents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value95103109117124131138146159
Percentage of FiniteLivedIntangibleAssetsNet1.31.41.41.41.41.51.50.01.5
Percentage of Assets0.10.20.20.20.20.20.20.20.2
Percentage of Assets ctl:TradeNamesandPatents0.00.00.00.00.00.00.00.00.0

us-gaap:ComputerSoftwareIntangibleAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302011-12-31
Value16171599159915761536146814501454146912271248133814151399144714931622
Percentage of FiniteLivedIntangibleAssetsNet22.321.120.219.117.916.515.60.013.50.00.00.00.00.00.00.00.0
Percentage of Assets2.52.52.52.42.42.12.02.01.92.62.62.72.72.62.62.72.9
Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CustomerRelationships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-312012-12-312012-09-302012-06-302011-12-31
Value724575967902824585808911930996671005810876221424012596279732543472369839284162489359357052734176358239
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets11.311.712.212.813.212.712.713.013.414.44.44.75.65.97.07.47.88.38.59.811.513.113.413.914.7
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Including Goodwill

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1020108411341165115811921126112310471286813823838838690689662660849840856843831829834823822841800796854900869
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.71.81.81.81.71.51.51.41.71.61.61.81.81.51.51.41.41.71.71.71.71.61.61.61.61.61.61.51.51.61.61.5

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value57037258658964955373553152864521476748573266324350965349473348423826460455474797357939184577444346214409397837484583459549315207564340194737506410731011
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.911.210.210.18.37.97.26.16.46.46.56.410.911.410.110.38.19.711.49.87.27.89.08.89.08.57.77.08.58.59.09.59.97.28.39.24.94.6

Long Term Debt Current

Accounts Payable Current

us-gaap:AccountsPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value15811724171216341481193313871360150815559399449941179103610671039968108710491068122610691153118311111158128510941207132011341026139913601256298299
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.72.62.52.32.81.91.82.02.11.91.92.12.52.22.32.22.02.22.12.22.42.12.32.32.12.22.42.02.22.42.11.82.52.42.31.41.4

Taxes Payable Current

us-gaap:TaxesPayableCurrent



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
Value354311388374386337409344390370357290460301330505458318535423418309372342410339
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.50.60.60.60.50.60.50.50.50.70.61.00.60.71.11.00.71.10.90.80.60.70.70.80.7

Dividends Payable Current

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent



Period End2020-03-312019-12-312019-09-302019-06-30
Value416416419488
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0
Percentage of Assets0.60.60.60.8

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent



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
Value369386318337297357374358428344216238177213255272302220268225259210224208255514498259274234254269279250252234109121
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.50.50.50.50.50.50.60.50.40.50.40.50.50.60.60.50.50.50.50.40.40.40.51.01.00.50.50.40.50.50.50.40.40.40.50.6

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value788804798852841832983750892
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.21.21.31.31.21.31.01.2

Long Term Debt

Debt And Capital Lease Obligations

us-gaap:DebtAndCapitalLeaseObligations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-06-302010-12-31
Value34610346943512534788354903606136527373153737737726249782507719976199931971819616200252022520414203532045620671211512095920940209662058220585207882060521836213447328
Percentage of DebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets54.053.654.353.954.851.349.850.250.049.949.449.242.942.542.141.642.142.541.941.641.341.241.841.440.940.539.638.738.738.138.938.933.3

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations



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
Value3348132394333813319334858354093574936878369403728324854248811818018185181841816519508187221850418834202542012119982197711981420181203912028319595194001950819682206672135621142197347316
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets52.350.051.651.553.850.448.749.649.449.349.248.939.038.738.938.641.139.338.038.540.940.139.539.138.739.039.238.136.535.935.735.736.438.037.336.033.2

Deferred Tax Liabilities Noncurrent

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent



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
Value451645944140421342654319439248845085517851835362544855275228539054455511553456965755580837613924401240495844
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.17.16.46.56.66.16.06.66.86.810.310.511.711.811.211.411.511.611.411.611.611.67.47.87.87.810.8

Minority Interest

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value279227662683262225472642263926672362238911451123111110861106111111061138117712291246124712521268121212041248
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.44.34.14.13.93.83.63.63.23.22.32.22.42.32.42.42.32.42.42.52.52.52.52.52.42.32.3

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-30
Value1316134213511467
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0
Percentage of Assets2.12.12.12.3

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value1329113470136741369213543198282280322989234432349112960130861330613399138921398514036140601425014587147651502316445165981679817191167141840018856192892019720311206382082721976216549658964796069467
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets20.720.821.121.220.928.231.130.931.331.125.625.728.628.529.729.729.529.529.229.829.830.032.532.832.833.232.234.635.135.737.036.936.337.138.739.544.143.80.00.0

us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-181-184-49-52-55-58-255-260-263-235-152-156-159-162-170-174-177-180
Percentage of StockholdersEquity-1.4-1.4-0.4-0.4-0.4-0.3-1.1-1.1-1.1-1.0-1.2-1.2-1.2-1.2-1.2-1.2-1.3-1.3
Percentage of Assets-0.3-0.3-0.1-0.1-0.1-0.1-0.3-0.3-0.4-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.4
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-2193-2229-2051-2091-2132-2173-2009-2041-2075-1731-1802-1836-1865-1895-1637-1663-1690-1715
Percentage of StockholdersEquity-16.5-16.5-15.0-15.3-15.7-11.0-8.8-8.9-8.9-7.4-13.9-14.0-14.0-14.1-11.8-11.9-12.0-12.2
Percentage of Assets-3.4-3.4-3.2-3.2-3.3-3.1-2.7-2.7-2.8-2.3-3.6-3.6-4.0-4.0-3.5-3.5-3.6-3.6
Percentage of Assets us-gaap:PensionPlansDefinedBenefit us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-114-39-54-43-170
Percentage of StockholdersEquity-0.9-0.3-0.4-0.3-0.10.0
Percentage of Assets-0.2-0.1-0.1-0.1-0.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-31
Value-2955-2680-2499-2419-2429-2461-2454-2490-2288-1995-1994-2050-2086-2117-1855-1881-1907-1934-1941-1959-2001-2017-789-779-795-802-1660-1688-1695-1701-984-998-1000-1012-158-141-139-141-89-85-123
Percentage of StockholdersEquity-22.2-19.9-18.3-17.7-17.9-12.4-10.8-10.8-9.8-8.5-15.4-15.7-15.7-15.8-13.4-13.5-13.6-13.8-13.6-13.4-13.6-13.4-4.8-4.7-4.7-4.7-9.9-9.2-9.0-8.8-4.9-4.9-4.8-4.9-0.7-0.7-1.4-1.5-0.9-0.90.0
Percentage of Assets-4.6-4.1-3.9-3.7-3.7-3.5-3.3-3.3-3.1-2.6-3.9-4.0-4.5-4.5-4.0-4.0-4.0-4.1-4.0-4.0-4.0-4.0-1.6-1.5-1.6-1.5-3.2-3.2-3.2-3.1-1.8-1.8-1.8-1.8-0.3-0.3-0.6-0.60.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



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-467-228-345-233-225-230-190-18950-29-40-58-62-60-48-44-40-39-25
Percentage of StockholdersEquity-3.5-1.7-2.5-1.7-1.7-1.2-0.8-0.80.2-0.1-0.3-0.4-0.5-0.4-0.3-0.3-0.3-0.3-0.2
Percentage of Assets-0.7-0.4-0.5-0.4-0.3-0.3-0.3-0.30.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-31
Value216342187422101223422257522852233992336023316233141437014637147331497015121152051518415178154601589616059163241653216671168741734317954182911869119079190521899918950189011885418236620061816094602045
Percentage of StockholdersEquity162.8162.4161.6163.2166.7115.3102.6101.699.599.2110.9111.9110.7111.7108.8108.7108.2108.0108.5109.0108.8108.7100.5100.4100.5100.9107.499.499.198.994.393.591.890.885.884.264.264.163.463.60.0
Percentage of Assets33.833.834.134.634.832.531.931.431.230.828.428.731.631.832.332.332.031.931.732.532.432.632.632.933.033.534.534.334.835.334.934.533.333.733.233.328.328.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-31
Value1098109010901090109010801081107910791069550550549547547546546544554563566569571571575584593604616626623622621619617602306305303299100
Percentage of StockholdersEquity8.38.18.08.08.05.44.74.74.64.64.24.24.14.13.93.93.93.93.93.93.83.83.53.43.43.43.53.33.33.23.13.13.03.02.82.83.23.23.23.20.0
Percentage of Assets1.71.71.71.71.71.51.51.51.41.41.11.11.21.21.21.21.11.11.11.11.11.11.11.11.11.11.11.11.11.21.11.11.11.11.11.11.41.40.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-31
Value-6486-6814-7018-7321-7693-164377710401336110334-51110-1791152132721778714114713113514466-17311931244128515061688206723192663297132913302329832333146
Percentage of StockholdersEquity-48.8-50.6-51.3-53.5-56.8-8.33.44.55.74.70.3-0.40.8-0.00.60.81.51.91.20.61.01.00.80.80.90.4-1.06.56.66.77.58.310.011.112.113.734.134.234.334.20.0
Percentage of Assets-10.1-10.5-10.8-11.3-11.9-2.31.11.41.81.50.1-0.10.2-0.00.20.20.40.60.40.20.30.30.30.30.30.1-0.32.22.32.42.83.13.64.14.75.415.015.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1098109010901090109010801081107910791069550550549547547546546544554563566569571571575584593604616626623622621619617602305304
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.71.71.71.71.51.51.51.41.41.11.11.21.21.21.21.11.11.11.11.11.11.11.11.11.11.11.11.11.21.11.11.11.11.11.11.41.4

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital



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
Value21634218742210122342225752285223399233602331623314143701463714733149701512115205151841517815460158961605916324165321667116874173431795418291186911907919052189991895018901188541823661946174
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.833.834.134.634.832.531.931.431.230.828.428.731.631.832.332.332.031.931.732.532.432.632.632.933.033.534.534.334.835.334.934.533.333.733.233.328.328.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value-6486-6814-7018-7321-7693-164377710401336110334-51110-1791152132721778714114713113514466-17311931244128515061688206723192663295832913302
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-10.1-10.5-10.8-11.3-11.9-2.31.11.41.81.50.1-0.10.2-0.00.20.20.40.60.40.20.30.30.30.30.30.1-0.32.22.32.42.83.13.64.14.75.415.015.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value-2955000000.0-2680000000.0-2499000000.0-2419000000.0-2429000000.0-2461000000.0-2454000000.0-2490000000.0-2288000000.0-1995000000.0-1994000000.0-2050000000.0-2086000000.0-2117000000.0-1855000000.0-1881000000.0-1907000000.0-1934000000.0-1941000000.0-1959000000.0-2001000000.0-2017000000.0-789000000.0-779000000.0-795000000.0-802000000.0-1660000000.0-1688000000.0-1695000000.0-1701000000.0-984000000.0-998000000.0-1000000000.0-1012000000.0-158000000.0-141000000.0-138957000.0-141153000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-4.6-4.1-3.9-3.7-3.7-3.5-3.3-3.3-3.1-2.6-3.9-4.0-4.5-4.5-4.0-4.0-4.0-4.1-4.0-4.0-4.0-4.0-1.6-1.5-1.6-1.5-3.2-3.2-3.2-3.1-1.8-1.8-1.8-1.8-0.3-0.3-0.6-0.6

Minority Interest

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-03-312010-03-31
Value1299190918881701118219961787158216671178669461
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues24.834.333.730.520.934.530.726.828.022.139.525.6

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-03-312010-03-31
Value-939000000.0-899000000.0-954000000.0-811000000.0-906000000.0-882000000.0-684000000.0-744000000.0-768000000.0-8021000000.0-208162000.0-168486000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-18.0-16.1-17.0-14.5-16.0-15.3-11.8-12.6-12.9-150.7-12.3-9.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-03-312010-03-31
Value-486-72457-924-320-1016-1415-643-9491266-364-248
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-9.3-13.01.0-16.6-5.7-17.6-24.3-10.9-16.023.8-21.5-13.8

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-03-312010-03-31
Value1299190918881701118219961787158216671178669461
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues24.834.333.730.520.934.530.726.828.022.139.525.6

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value314223302371-6165-24122722921151117921716342152196236338205143192188188193203239-104526929823327074200109140102211225232238252
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.04.05.46.7-109.2-41.74.74.91.921.02.30.43.91.03.54.55.47.64.53.24.34.24.24.34.55.3-23.15.96.65.15.91.64.32.33.02.312.413.113.313.414.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value44464344443437-37-3538-32-33
Percentage of NetIncomeLoss14.020.614.211.9-0.7-1.413.6-12.7-30.441.3-188.2-20.2
Percentage of Revenues0.80.80.80.80.80.60.6-0.6-0.60.9-0.8-0.8
Percentage of Revenues us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value314223302371-6165-24122722921151117921716342152196236338205143192188188193203298200211252
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.04.05.46.7-109.2-41.74.74.91.921.02.30.43.91.03.54.55.47.64.53.24.34.24.24.34.56.64.312.414.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value11601210123511961188126212851290128311979109498809589959879761053104810481040113110971093110711171208368353
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value105901061181263686277123-688-117-89-37-26111011257401637-109310210616611539-15
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation

us-gaap:ShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-03-312010-03-31
Value6948384333424954414721222120202218161920181720231997
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value694838433342495441
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-03-312010-03-31
Value-939000000.0-899000000.0-954000000.0-811000000.0-906000000.0-882000000.0-684000000.0-744000000.0-768000000.0-8021000000.0-208162000.0-168486000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-18.0-16.1-17.0-14.5-16.0-15.3-11.8-12.6-12.9-150.7-12.3-9.4

Payments To Acquire Property Plant And Equipment

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-03-312010-03-31
Value-486-72457-924-320-1016-1415-643-9491266-364-248
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-9.3-13.01.0-16.6-5.7-17.6-24.3-10.9-16.023.8-21.5-13.8

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value123727199880000013017900660800946988227-139605940483009882032
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0100.00.00.00.00.00.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.00.0100.00.0100.00.00.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value248826986996071533971416556835182149931269721439254312912038663841744784115196256
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value291271275269285577579576580572291294296291290296290293296305304304308307309341452221218
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends Common Stock

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value291271275269285577579576580572291294296291290296290293296305304304308307309341452221218
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value248826986996071533971416556835182149931269721439254312912038663841744784115196256
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Debt Instrument Interest Rate Stated Percentage

Effective Income Tax Rate Continuing Operations

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

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value16671686172118441952
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0

Litigation Reserve Current

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value15911717143144047451842073253758761646357216224142193128129
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedContractCost

ctl:CapitalizedContractCostIncurred

ctl:ContractAcquisitionCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value496048435774534737
Percentage of CapitalizedContractCostIncurred100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:ContractFulfillmentCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value36394144344146296
Percentage of CapitalizedContractCostIncurred73.565.085.4102.359.655.486.861.716.2

ctl:GainLossonExtinguishmentofDebtOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-792457923-290-10
Percentage of GainLossonExtinguishmentofDebtOperatingActivities100.0100.0100.0100.0100.0100.0100.00.0100.00.0

ctl:IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value220921052223221522282189222821112074
Percentage of IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1619-1877-1757-1777-1805-1923-1944-2086-2092
Percentage of IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization-73.3-89.2-79.0-80.2-81.0-87.8-87.3-98.8-100.9

us-gaap:OperatingSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value38283982398039924033257626714197416623171648
Percentage of IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization173.3189.2179.0180.2181.0117.7119.9198.8200.90.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value117012231216123012451248130012811276
Percentage of IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization53.058.154.755.555.957.058.360.761.5

us-gaap:OperatingSegments, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value837875872865878890873878881
Percentage of IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization37.941.639.239.139.440.739.241.642.5

us-gaap:OperatingSegments, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value567581565576564594576576595
Percentage of IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization25.727.625.426.025.327.125.927.328.7

us-gaap:OperatingSegments, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value444464467469470471502536504
Percentage of IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization20.122.021.021.221.121.522.525.424.3

us-gaap:OperatingSegments, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value810839860852876909921926910
Percentage of IncomeLossFromContinuingOperationsBeforeInterestIncomeTaxDepreciationandAmortization36.739.938.738.539.341.541.343.943.9

us-gaap:StatementBusinessSegments

ctl:NumberOfCategoriesOfProductsAndServices

ctl:Consumer



Period End2020-03-312019-12-312019-09-30
Value4.00.00.0
Percentage of NumberOfCategoriesOfProductsAndServices100.00.00.0

ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-30
Value4.00.00.0
Percentage of NumberOfCategoriesOfProductsAndServices100.00.00.0

ctl:OperatingExpensesExcludingDepreciationAmortizationandImpairment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value301934653383336334193589359037913871
Percentage of OperatingExpensesExcludingDepreciationAmortizationandImpairment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value161918771757177718051923194420862092
Percentage of OperatingExpensesExcludingDepreciationAmortizationandImpairment53.654.251.952.852.853.654.255.054.0

us-gaap:OperatingSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value140015881626158616141666164617051779
Percentage of OperatingExpensesExcludingDepreciationAmortizationandImpairment46.445.848.147.247.246.445.845.046.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ctl:Consumer



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value157163182187196219239260293
Percentage of OperatingExpensesExcludingDepreciationAmortizationandImpairment5.24.75.45.65.76.16.76.97.6

us-gaap:OperatingSegments, ctl:Enterprise



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value583680678640645668632645666
Percentage of OperatingExpensesExcludingDepreciationAmortizationandImpairment19.319.620.019.018.918.617.617.017.2

us-gaap:OperatingSegments, ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value298323334326327329316327340
Percentage of OperatingExpensesExcludingDepreciationAmortizationandImpairment9.99.39.99.79.69.28.88.68.8

us-gaap:OperatingSegments, ctl:SmallandMediumBusiness



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value214267267267285285283283280
Percentage of OperatingExpensesExcludingDepreciationAmortizationandImpairment7.17.77.97.98.37.97.97.57.2

us-gaap:OperatingSegments, ctl:Wholesale



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value148155165166161165176190200
Percentage of OperatingExpensesExcludingDepreciationAmortizationandImpairment4.94.54.94.94.74.64.95.05.2

ctl:OperatingLeaseLeaseIncomePercentofOperatingRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.060.0199999999999999970.040.040.040.00.040.04
Percentage of OperatingLeaseLeaseIncomePercentofOperatingRevenue100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value332632661510254111401212112151159111115
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllocatedShareBasedCompensationExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6948384333414954
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302012-09-302011-09-30
Value431400438440429500446447444406269276409459
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-03-31
Value2514513453424332
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedContractCost

us-gaap:CapitalizedContractCostAmortization

ctl:ContractAcquisitionCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value555350515047444137
Percentage of CapitalizedContractCostAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:ContractFulfillmentCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value373432352327341810
Percentage of CapitalizedContractCostAmortization67.364.264.068.646.057.477.343.927.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-126286991-34-4498-312195-50-5577-1936141-882-51
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared



Period End2020-03-312019-11-212019-12-312019-08-222019-09-302019-05-232019-06-302019-03-012019-03-312018-11-142018-12-312018-08-212018-09-302018-05-232018-06-302018-02-212018-03-312017-11-142017-11-142017-12-312017-08-222017-08-222017-09-302017-05-242017-05-242017-06-302017-02-212017-02-212017-03-312016-11-152016-12-312016-08-232016-09-302016-05-182016-06-302016-02-232016-03-312015-11-102015-08-252015-09-302015-05-202015-06-302015-02-232015-03-312014-11-112014-08-192014-09-302014-05-282014-06-302014-02-242014-03-312013-11-122013-08-272013-09-302013-05-232013-06-302013-02-262013-03-312012-11-132012-08-212012-09-302012-05-242012-06-302012-02-122012-03-312011-11-152011-11-302011-08-232011-08-312011-09-302011-05-182011-05-312011-06-302011-01-242011-03-312011-01-312010-11-302010-08-302010-09-302010-05-312010-06-302010-02-282010-03-31
Value0.250.250.250.250.250.250.250.250.250.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.540.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.7250.725
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SubsequentEventType

us-gaap:SubsequentEvent



Period End2020-02-272019-03-012018-02-21
Value0.250.250.54
Percentage of CommonStockDividendsPerShareDeclared0.0100.0100.0

us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

ctl:WorkforceSubjecttoCollectiveBargainingArrangementsExpired, us-gaap:UnionizedEmployeesConcentrationRisk



Period End2020-03-31
Value0.04
Percentage of ConcentrationRiskPercentage1100.0

us-gaap:NumberOfEmployeesTotal, us-gaap:UnionizedEmployeesConcentrationRisk



Period End2020-03-312019-09-302019-03-312017-03-31
Value0.240.730.260.37
Percentage of ConcentrationRiskPercentage1600.00.00.00.0

us-gaap:WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYear, us-gaap:UnionizedEmployeesConcentrationRisk



Period End2020-03-312019-03-31
Value0.090.06
Percentage of ConcentrationRiskPercentage1225.00.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value495494744490-3345650523
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:VariableRate, dei:LegalEntity

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

ctl:TermLoanA, us-gaap:MediumTermNotes, us-gaap:LondonInterbankOfferedRateLIBOR, ctl:CenturyLinkInc.



Period End2020-03-31
Value0.02
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

ctl:TermLoanA1, us-gaap:MediumTermNotes, us-gaap:LondonInterbankOfferedRateLIBOR, ctl:CenturyLinkInc.



Period End2020-03-31
Value0.02
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

ctl:TermLoanB, us-gaap:MediumTermNotes, us-gaap:LondonInterbankOfferedRateLIBOR, ctl:CenturyLinkInc.



Period End2020-03-31
Value0.0225
Percentage of DebtInstrumentBasisSpreadOnVariableRate1112.5

ctl:TrancheB2027TermLoan, us-gaap:MediumTermNotes, us-gaap:LondonInterbankOfferedRateLIBOR, ctl:Level3FinancingInc.



Period End2020-03-31
Value0.0175
Percentage of DebtInstrumentBasisSpreadOnVariableRate187.5

us-gaap:LongtermDebtType, us-gaap:VariableRate, dei:LegalEntity

us-gaap:MediumTermNotes, us-gaap:LondonInterbankOfferedRateLIBOR, ctl:QwestCorporation



Period End2020-03-31
Value0.02
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

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
Value-50000000.0-56000000.0-54000000.0-56000000.0-57000000.0-43000000.0-45000000.0-46000000.0-44000000.0-51000000.0-51000000.0-52000000.0-51000000.0-44000000.0-44000000.0-45000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value4354455555555555
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value-3-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-75.0-66.7-40.0-50.0-50.0-40.0-40.0-40.0-40.0-40.0-40.0-40.0-40.0-40.0-40.0-40.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

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
Value149154155153156172171171173167166167166182183183
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value20282728272424252425252525272927
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
Value82110109107110969998100103102105101106107107
Percentage of DefinedBenefitPlanInterestCost410.0392.9403.7382.1407.4400.0412.5392.0416.7412.0408.0420.0404.0392.6369.0396.3

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
Value28343536353432353334343434393635
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value-430202223-3-12-13-151121-5-18-18
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-14.388.257.161.165.7-8.8-37.5-37.1-45.52.92.95.92.9-12.8-50.0-51.4

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
Value4434454545454545
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
Value16141414141717161616161417161615
Percentage of DefinedBenefitPlanServiceCost400.0350.0466.7350.0350.0340.0425.0320.0400.0320.0400.0280.0425.0320.0400.0300.0

us-gaap:DepreciationAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value11601210123511961188126212851290128311979109498809589959879761053104810481040113110971093110711351123111711441208120812251198368358358353
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



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
Value1160121012351196118812621285129012831197910949880958995987976105310481048-1040113110971093110711661135
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-100.0100.0100.0100.0100.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStock

us-gaap:AdditionalPaidInCapital



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
Value2862882722722725860005292891192401731060051184106105
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation



Period End2020-03-31
Value-1000000.0
Percentage of FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation100.0

us-gaap:StatementBusinessSegments

ctl:Business



Period End2020-03-31
Value-1000000.0
Percentage of FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation100.0

ctl:Consumer



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation-0.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery



Period End2020-03-31
Value13
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0

us-gaap:StatementBusinessSegments

ctl:Business



Period End2020-03-31
Value6
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery46.2

ctl:Consumer



Period End2020-03-31
Value7
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery53.8

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs



Period End2020-03-31
Value43
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0

us-gaap:StatementBusinessSegments

ctl:Business



Period End2020-03-31
Value19
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs44.2

ctl:Consumer



Period End2020-03-31
Value24
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs55.8

us-gaap:GoodwillForeignCurrencyTranslationGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-6127-2011-116-8
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

ctl:InternationalandGlobalAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value-6127-2011
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0

us-gaap:GoodwillImpairmentLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-10-312018-12-312018-09-302018-06-302018-03-312014-12-312014-09-302013-12-312013-09-302012-09-30
Value000065062700270000000011000
Percentage of GoodwillImpairmentLoss0.00.00.00.0100.0100.0100.00.00.00.00.00.00.0100.00.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312014-12-312014-09-302013-12-312013-09-30
Value00006506272600000-81100
Percentage of GoodwillImpairmentLoss0.00.00.00.0100.0101.00.00.00.00.00.00.0100.0

us-gaap:ImpairmentOfLongLivedAssetsToBeDisposedOf



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
Value2-1010-26508270018127-11011012010010800320
Percentage of ImpairmentOfLongLivedAssetsToBeDisposedOf100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.00.00.0100.00.0100.00.00.0100.00.0

us-gaap:IncreaseDecreaseInAccountsPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-11541-27-23927522-159-14-3019-31-8157-22-478-8428-32-8091-96-48123-34-1980-59
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-60-2-125137-5-334382-117-296945-11610833151-26414024275239132-6034-184414
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedTaxesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-16-111111-2545-142364-16720-4974-177206-44-20748160-218130-16136-12249-7665768096
Percentage of IncreaseDecreaseInAccruedTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value366-29190-103336-169-23414262393-8540266-116-40-872176-1733416140-2266129537-156-32
Percentage of IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value14-173-5-714-576-255-145120-38104-12-2360352443110-330-63-3-14-4715
Percentage of IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-25000000.012000000.0-16000000.06000000.0-14000000.0-28000000.0-444000000.0-146000000.0-49000000.0-21000000.0-125000000.0-31000000.0-25000000.0-9000000.0-115000000.0-7000000.0-21000000.0-7000000.0-115000000.0-10000000.0-9000000.071000000.0-153000000.0-74000000.0-28000000.0-178000000.0-75000000.0-109615000.0-284807000.0
Percentage of IncreaseDecreaseInPensionAndPostretirementObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:IncrementalCommonSharesAttributableToConversionOfDebtSecurities

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value10000.010000.010000.00.010000.010000.010000.010000.010000.010000.010000.010000.010000.00.010000.010000.010000.0
Percentage of IncrementalCommonSharesAttributableToConversionOfDebtSecurities100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value62105430011010001
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidCapitalized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value23221817151114131517202120161412121112161313121210993
Percentage of InterestPaidCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value383522456570480567510570491484293369255379262398262396260384270404262407265265-2447065
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatutoryAccountingPracticesByJurisdiction

us-gaap:LitigationSettlementAmountAwardedToOtherParty

ctl:U.S.DistrictCourtfortheDistrictofMinnesota



Period End2020-03-312019-09-302019-06-30
Value15015
Percentage of LitigationSettlementAmountAwardedToOtherParty100.00.0100.0

dei:LegalEntity

us-gaap:LossContingencyDamagesSoughtValue

ctl:Level3ParentLLC



Period End2020-03-312019-12-312019-09-30
Value5000
Percentage of LossContingencyDamagesSoughtValue100.00.00.0

us-gaap:NumberOfReportableSegments



Period End2020-03-312019-09-302018-09-302018-06-302018-03-312017-11-012017-03-312017-01-102014-11-01
Value5.00.00.00.02.02.02.02.02.0
Percentage of NumberOfReportableSegments100.00.00.00.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent



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
Value-319-227-123-34-12-41-1-23979-36184-2-287-4-4-1-22-1011-11-1277-16
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0-138000194000-86000600
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-0.060.8-0.0-0.0-0.0-473.2-0.0-0.00.0238.90.00.0-0.0-2.1-0.0-0.0

us-gaap:PensionPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0-219000-19500039000-28000
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-0.096.5-0.0-0.0-0.0475.6-0.0-0.00.0-108.30.00.0-0.097.6-0.0-0.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value-8013-11-26-17
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent25.1-5.78.976.5141.7

us-gaap:AccumulatedTranslationAdjustment



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
Value-239117-112-85-40-1-2397911184-2-13-4-4-1-4-1011-11-8-16
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent74.9-51.591.123.5-41.797.6100.0100.0100.0-30.6100.0100.0100.04.5100.0100.0100.018.2100.0100.0100.00.6100.0

us-gaap:OperatingLeaseLeaseIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value333794202205199189221253219
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value12213222222224443531
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value0210110-1-1111-111-1-133-2-23-20
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax0.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value-80000000.015000000.0-11000000.0-26000000.0-17000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax



Period End2020-03-312019-09-302019-06-302019-03-31
Value-26000000.0-3000000.0-8000000.0-6000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:InterestRateSwap



Period End2020-03-312019-09-302019-06-302019-03-31
Value-106000000.0-14000000.0-34000000.0-23000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax



Period End2020-03-312019-03-31
Value-50
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.00.0

us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateSwap



Period End2020-03-312019-03-31
Value50
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax-100.00.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-2330-22-31211-4414170000000000
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value-275-181-801032-736-202114-1563631-2622626277184216-1228-10167277614212-17-222
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value3-135333197534-83433843
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-1.174.6-3.830.09.4-2814.313.9-1.53.58300.07.18.39.7-3.115.411.5

us-gaap:PensionPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value36-178404141-16432343171342930-2582627
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-13.198.3-50.0410.0128.12342.988.9-16.827.2-7100.060.780.696.898.5100.0103.8

us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value-7515-11-26-17
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent27.3-8.313.8-260.0-53.1

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-275-181-801032-736-203114-1563631-2622626277184216-1228-101676122
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.5100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value-239117-112-85-40-1-2397911184-2-12-4-4-1-4-1011-11-7-168113-5-8
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent86.9-64.6140.0-80.015.6571.4-2.8118.369.3-1100.032.111.1-6.54.6-15.4-15.4-3.7-57.1-55.626.2-68.80.6160.050.014.348.1-71.4-133.3

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value-38000000.0-41000000.0-42000000.0-43000000.0-34000000.0-35000000.0-33000000.0-36000000.0-30000000.0-31000000.0-28000000.0-28000000.0-26000000.0-24000000.0-27000000.0-23000000.0-3000000.0-3000000.0-3000000.0-13000000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value-12101-13-14-14-12-111111-3-15-22-20162-16-17-161615-15-22-2-8
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:OtherCostAndExpenseOperating

us-gaap:MaterialReconcilingItems



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
Value16191877175717771805606670752686784440605492
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:OtherNonoperatingIncome

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value980847950976-5499-1841894767750
Percentage of OtherNonoperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement



Period End2020-03-312019-03-31
Value11-2
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0

us-gaap:PaymentsToAcquireProductiveAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value974940957800931915684771805743753830780971746653611833767656616934712731670837801
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312012-03-312011-03-31
Value-69-24-7-3-27-2-12-10-26130000000-1-10-31031
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0100.0100.00.0100.0100.00.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-31
Value1125-45050-45145-405900-4054055
Percentage of ProceedsFromRepaymentsOfLinesOfCredit100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfProductiveAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value35392812533012231478334581147231214630-1175
Percentage of ProceedsFromSaleOfProductiveAssets100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:ProvisionForDoubtfulAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value35293139463436364749493147484850464944424249473330275620
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanLossesExpensed



Period End2020-03-31
Value35
Percentage of ProvisionForLoanLossesExpensed100.0

us-gaap:StatementBusinessSegments

ctl:Business



Period End2020-03-31
Value18
Percentage of ProvisionForLoanLossesExpensed51.4

ctl:Consumer



Period End2020-03-31
Value17
Percentage of ProvisionForLoanLossesExpensed48.6

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent



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
Value-44-46-43-44-44-34-37-37-35-35-38-32-33-25-30-30-28-29-28-31-27-49-6
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-3-3-3-3-3-3-5-3-4-3-4-3-3-2-4-3
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent6.86.57.06.86.88.813.58.111.48.610.59.49.18.013.310.0

us-gaap:PensionPlansDefinedBenefit, us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-36-41-40-41-41-31-32-34-31-32-34-29-30-22-26-27
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent81.889.193.093.293.291.286.591.988.691.489.590.690.988.086.790.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value-5-2000
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent11.44.3-0.0-0.0-0.0

us-gaap:AccumulatedTranslationAdjustment



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
Value0000000000000-10000000-10
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.04.0-0.0-0.0-0.0-0.0-0.0-0.0-0.02.0-0.0

us-gaap:RepaymentsOfDebt



Period End2020-03-312018-09-302013-03-312012-03-312011-03-31
Value24001300568493
Percentage of RepaymentsOfDebt100.0100.0100.0100.0100.0

dei:LegalEntity

ctl:CenturyLinkInc.



Period End2020-03-31
Value1250
Percentage of RepaymentsOfDebt52.1

us-gaap:LongtermDebtType

us-gaap:MediumTermNotes



Period End2020-03-31
Value31
Percentage of RepaymentsOfDebt1.3

us-gaap:LongtermDebtType, dei:LegalEntity

us-gaap:SeniorNotes, ctl:CenturyLinkInc.



Period End2020-03-31
Value78
Percentage of RepaymentsOfDebt3.2

us-gaap:SeniorNotes, ctl:QwestCapitalFundingInc



Period End2020-03-31
Value1100
Percentage of RepaymentsOfDebt45.8

us-gaap:RevenueNotFromContractWithCustomer



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value481355356358312325
Percentage of RevenueNotFromContractWithCustomer100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueOther

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value800010-120102012010201
Percentage of StockIssuedDuringPeriodValueOther100.00.00.00.0100.0100.0100.00.0100.0100.00.0100.0100.00.0100.00.0100.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross

us-gaap:AdditionalPaidInCapital



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
Value794838443445485733202123152021221619182317
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1092109010901083108010781073549549547546545544-4559563566
Percentage of WeightedAverageNumberOfSharesIssuedBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:WeightedAverageNumberOfSharesRestrictedStock

us-gaap:CommonClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value17181914131478776660544
Percentage of WeightedAverageNumberOfSharesRestrictedStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:FinanceLeaseandOtherObligations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value205222214223231801
Percentage of FinanceLeaseandOtherObligations100.0100.0100.0100.0100.0100.0

ctl:IntangibleAssetsNetIncludingGoodwillAndOtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value334103389534265347703517540028430894340143784445653020830434246182481626228264332662826885273362758327869281382830528581289252923429507308293102931375317863218933083
Percentage of IntangibleAssetsNetIncludingGoodwillAndOtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-01
Value2200230024002500240025002600260022
Percentage of AccountsReceivableGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-01
Value2110219422242379228623462436241423782504
Percentage of AccountsReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-012017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value85106133128145142153160159155164178152162155158
Percentage of AllowanceForDoubtfulAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value99106143139156142153160168164165174180178173160149152160155163162155145145155151147146158157157158145114957060
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value78883121915140140772343237681426
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BankOverdrafts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value01062128658482436695141565946506855656280778489881322379113224861
Percentage of BankOverdrafts0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedContractCost

us-gaap:CapitalizedContractCostNet

ctl:ContractAcquisitionCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value320326319321329322295286254254
Percentage of CapitalizedContractCostNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ctl:ContractFulfillmentCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2202212162071981871731166973
Percentage of CapitalizedContractCostNet68.867.867.764.560.258.158.640.627.228.7

us-gaap:CapitalizedContractCost

us-gaap:CapitalizedContractCostNetCurrent

ctl:ContractAcquisitionCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value180178175174173167
Percentage of CapitalizedContractCostNetCurrent100.0100.0100.0100.0100.0100.0

ctl:ContractFulfillmentCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1181151111058882
Percentage of CapitalizedContractCostNetCurrent65.664.663.460.350.949.1

us-gaap:ContractWithCustomerAssetNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-01
Value125130145141134140352158188255
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3342515758523591480
Percentage of ContractWithCustomerAssetNetCurrent100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ContractWithCustomerLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-01-01
Value94310289871000869860716553623
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity

us-gaap:DebtInstrumentCarryingAmount

ctl:A4.000SeniorSecuredNotesDue2027, us-gaap:SeniorNotes, ctl:CenturyLinkInc.



Period End2020-03-31
Value1250
Percentage of DebtInstrumentCarryingAmount100.0

ctl:NewRevolvingCreditFacility, us-gaap:LineOfCredit, ctl:CenturyLinkInc.



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1375250700650550
Percentage of DebtInstrumentCarryingAmount110.00.00.00.00.0

ctl:SeniorNotesMaturing20272029, us-gaap:SeniorNotes, ctl:Level3FinancingInc.



Period End2020-03-312019-12-312018-12-31
Value150015000
Percentage of DebtInstrumentCarryingAmount120.00.00.0

ctl:TermLoanA, us-gaap:MediumTermNotes, ctl:CenturyLinkInc.



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value11521536155815791622
Percentage of DebtInstrumentCarryingAmount92.20.00.00.00.0

ctl:TermLoanA1, us-gaap:MediumTermNotes, ctl:CenturyLinkInc.



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value329333338342351
Percentage of DebtInstrumentCarryingAmount26.30.00.00.00.0

ctl:TermLoanB, us-gaap:MediumTermNotes, ctl:CenturyLinkInc.



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value49875880589559105940
Percentage of DebtInstrumentCarryingAmount399.00.00.00.00.0

ctl:TrancheB2027TermLoan, us-gaap:MediumTermNotes, ctl:Level3FinancingInc.



Period End2020-03-312019-12-312018-12-31
Value311131110
Percentage of DebtInstrumentCarryingAmount248.90.00.0

us-gaap:LongtermDebtType, dei:LegalEntity

us-gaap:SeniorNotes, ctl:CenturyLinkInc.



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value86188696744676988036
Percentage of DebtInstrumentCarryingAmount689.40.00.00.00.0

us-gaap:SeniorNotes, ctl:Embarq



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value14371450145014501485
Percentage of DebtInstrumentCarryingAmount115.00.00.00.00.0

us-gaap:SeniorNotes, ctl:Level3FinancingInc.



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value55155515591553155315
Percentage of DebtInstrumentCarryingAmount441.20.00.00.00.0

us-gaap:SeniorNotes, ctl:QwestCapitalFundingInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value352352352352697
Percentage of DebtInstrumentCarryingAmount28.20.00.00.00.0

us-gaap:SeniorNotes, ctl:QwestCorporation



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value48565956595659565956
Percentage of DebtInstrumentCarryingAmount388.50.00.00.00.0

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

us-gaap:DebtInstrumentRepurchasedFaceAmount

ctl:A4.000SeniorSecuredNotesDue2027, us-gaap:SeniorNotes, us-gaap:SubsequentEvent, ctl:CenturyLinkInc.



Period End2020-04-01
Value973
Percentage of DebtInstrumentRepurchasedFaceAmount100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet



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
Value45523021118-2-11-17-23164166135133131130128-125121119-115-111-108-98-88-78-2614-2-18-71-90-231-269-365-418173
Percentage of DebtInstrumentUnamortizedDiscountPremiumNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCreditsAndOtherLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value1158111620110841112811014948895339958964399809456971510020100849987101261014710218104531075910922110859642980210006
Percentage of DeferredCreditsAndOtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value270293266263274283292334343350203206190193196179
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilitiesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value29572918291028262701252725022413
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:InterestRateSwap, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value15251715723
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value152517157230
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.00.0

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-06-302019-03-312018-12-31
Value1525157230
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.00.0

us-gaap:EmployeeRelatedLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value72910378829218231104993929798890679669583802548562462602682576578641699572598650679584601683778653692634697719176159
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLosses



Period End2020-03-312019-12-31
Value9995
Percentage of FinancingReceivableAllowanceForCreditLosses100.0100.0

us-gaap:StatementBusinessSegments

ctl:Business



Period End2020-03-312019-12-31
Value6258
Percentage of FinancingReceivableAllowanceForCreditLosses62.661.1

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

ctl:TradeNamesandPatents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value989183766961544631
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ComputerSoftwareIntangibleAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302011-12-31
Value3031295728582765267826162547244722942019177815331193814749658441
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization3092.93249.53443.43638.23881.24288.54716.75319.67400.00.00.00.00.00.00.00.00.0

us-gaap:CustomerRelationships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value101149809948191528825849281537803745070966902671665196318632261045878564854145177493246833641252422351941163913371021705349
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization10320.410779.111422.912042.112789.913921.315098.116963.00.022890.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxesReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value733558769827942725625851
Percentage of IncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value269269269269269269269269269269269268321268268268422418545418268268
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value337280328294352316362343386363309262321260320258318250329260315256330264273
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent



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
Value11292300174415956326527784374374431241961499150315341451517150319101519202550116911881126785191302119312051198190322004801034161071687316
Percentage of LongTermDebtAndCapitalLeaseObligationsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:LongTermDebtFairValue

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value344053447234911345653525935260357023647136509368352423824311195531955319277191751961019800
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value331173573735739349143506932915357503567135677364022464225230200951963920076194341956119473
Percentage of LongTermDebtFairValue96.3103.7102.4101.099.593.3100.197.897.798.8101.7103.8102.8100.4104.1101.499.898.3

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity

us-gaap:LongtermDebtWeightedAverageInterestRate

ctl:TermLoanB, us-gaap:MediumTermNotes, ctl:CenturyLinkInc.



Period End2020-03-312019-12-31
Value0.032390.04549
Percentage of LongtermDebtWeightedAverageInterestRate100.0100.0

ctl:TrancheB2027TermLoan, us-gaap:MediumTermNotes, ctl:Level3FinancingInc.



Period End2020-03-312019-12-31
Value0.027390.03549
Percentage of LongtermDebtWeightedAverageInterestRate84.678.0

us-gaap:LongtermDebtType, dei:LegalEntity

us-gaap:MediumTermNotes, ctl:CenturyLinkInc.



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.029890.045490.047940.051520.05272
Percentage of LongtermDebtWeightedAverageInterestRate92.3100.00.00.00.0

us-gaap:MediumTermNotes, ctl:QwestCorporation



Period End2020-03-312019-12-312018-12-31
Value0.02990.0380.0453
Percentage of LongtermDebtWeightedAverageInterestRate92.383.50.0

us-gaap:LossContingencyEstimateOfPossibleLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-06-30
Value143133134121138
Percentage of LossContingencyEstimateOfPossibleLoss100.0100.0100.0100.0100.0

us-gaap:LitigationStatus, ctl:LitigationByCase

us-gaap:PendingLitigation, ctl:PeruvianTaxLitigation



Period End2020-03-31
Value6
Percentage of LossContingencyEstimateOfPossibleLoss4.2

us-gaap:LossContingenciesByNatureOfContingency

us-gaap:UnfavorableRegulatoryAction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302017-12-312017-09-30
Value100100100100100000
Percentage of LossContingencyEstimateOfPossibleLoss69.90.075.274.682.60.10.00.0

us-gaap:LitigationStatus, ctl:LitigationByCase

us-gaap:LossContingencyRangeOfPossibleLossPortionNotAccrued

us-gaap:PendingLitigation, ctl:BrazilianTaxClaims



Period End2020-03-31
Value37
Percentage of LossContingencyRangeOfPossibleLossPortionNotAccrued100.0

us-gaap:Range, us-gaap:LitigationStatus, ctl:LitigationByCase

srt:Maximum, us-gaap:PendingLitigation, ctl:BrazilianTaxClaims



Period End2020-03-31
Value42
Percentage of LossContingencyRangeOfPossibleLossPortionNotAccrued113.5

us-gaap:MaterialsSuppliesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value11910513715115412013110711112813114413813413613813614413612413713213413215516717216213412597105
Percentage of MaterialsSuppliesAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAssetsMiscellaneousCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312010-12-31
Value855953669810813415494133154195421061129197867174707138566344454740217415033
Percentage of OtherAssetsMiscellaneousCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherIntangibleAssetsNet



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
Value198119711977196219291868185718691870189715391556153415311518150615251555156815861616164716641676175018021842176217311795185919222161223924522568622
Percentage of OtherIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockSharesIssued



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
Value7000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.09000.09000.09000.09000.09000.09000.09000.0
Percentage of PreferredStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockSharesOutstanding



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
Value7000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.07000.09000.09000.09000.09000.09000.09000.09000.0
Percentage of PreferredStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312011-03-312010-12-31
Value0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0236000.0236000.0
Percentage of PreferredStockValue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0100.0

us-gaap:PrepaidExpenseCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312010-12-31
Value33327435237138630737932935329424524727220627128527623827328629326026028429926627729930125727824041
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value33333435550
Percentage of RestrictedCashCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:RestrictedCashNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value24242427302627273131600460152
Percentage of RestrictedCashNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCostAndReserve

us-gaap:RestructuringReserve

us-gaap:EmployeeSeverance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value558926396087223731331915299891317142619222417111210171829623748681869
Percentage of RestructuringReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept

us-gaap:Revenues us-gaap:ProductOrService


us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments


us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:CostOfGoodsAndServicesSold us-gaap:ConsolidationItems


us-gaap:CostOfGoodsAndServicesSold us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:SellingGeneralAndAdministrativeExpense us-gaap:ConsolidationItems


us-gaap:SellingGeneralAndAdministrativeExpense us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:OtherNonoperatingIncomeExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents


us-gaap:Goodwill us-gaap:StatementBusinessSegments


us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:RetirementPlanType, us-gaap:StatementEquityComponents