BRK-B


Line plots across dimensions of each concept
Tables

Table of contents


us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesOutstanding
us-gaap:StatementClassOfStock
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:StatementClassOfStock
us-gaap:EarningsPerShareBasic

us-gaap:Revenues
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:PremiumsEarnedNet
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:SellingGeneralAndAdministrativeExpense
us-gaap:ConsolidationItems
us-gaap:InterestExpense
us-gaap:ProductOrService

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:NetIncomeLoss

us-gaap:Assets
us-gaap:ProductOrService

us-gaap:Liabilities
us-gaap:ProductOrService

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
us-gaap:ProductOrService
us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:InventoryNet
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:ProductOrService, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:ProductOrService
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:ProductOrService
us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:MinorityInterest

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:TreasuryStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:DepreciationDepletionAndAmortization

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:ProductOrService
us-gaap:ProceedsFromIssuanceOfLongTermDebt
us-gaap:ProductOrService
us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:ProductOrService
us-gaap:RepaymentsOfLongTermDebt

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ProceedsFromRepaymentsOfShortTermDebt
us-gaap:StatementClassOfStock
brka:ConversionOfSharesFromOneClassToAnotherClassOfStock
us-gaap:ProductOrService
brka:CostOfLeasing
us-gaap:ProductOrService
brka:CostsOfServicesAndOperatingExpenses
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity
brka:DebtMaturingDuringPeriod
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
brka:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossAttributableToCommonStockholders
us-gaap:FairValueByFairValueHierarchyLevel
brka:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInRegulatoryAssetsAndLiabilities

brka:IncreaseDecreaseInDeferredChargesReinsuranceAssumed

brka:IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests
us-gaap:StatementEquityComponents
us-gaap:ProductOrService
brka:InsuranceUnderwritingExpenses
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
brka:InvestmentIncomeInterestDividendAndOther
us-gaap:ProductOrService

brka:PaymentsToAcquireEquitySecurities

brka:PaymentsToAcquireUSTreasuryBillsAndAvailableForSaleSecuritiesDebt
us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
brka:PercentageOfDeclineInEquityIndexValues
us-gaap:ProductOrService
brka:PercentageOfIncreaseOrDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
us-gaap:ProductOrService
brka:PolicyholderBenefitsAndClaimsIncurredLifeAnnuityAndHealth

brka:ProceedsFromRedemptionsAndMaturitiesOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt

brka:ProceedsFromSaleOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt

brka:ProceedsFromSalesAndRedemptionsOfEquitySecurities
us-gaap:ProductOrService
brka:ServiceRevenuesAndOtherIncome

brka:SharesIssuedAndRepurchased
us-gaap:StatementEquityComponents

brka:TaxableGainsOnSalesOfEquitySecurities

us-gaap:AmortizationOfIntangibleAssets

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1
us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostsAndExpenses
us-gaap:ProductOrService

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:Depreciation
us-gaap:ProductOrService

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentDividendsOrDistributions
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationRevenue

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType
us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:GainLossOnInvestments

us-gaap:GoodwillAcquiredDuringPeriod

us-gaap:GoodwillTranslationAndPurchaseAccountingAdjustments

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ConsolidationItems
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:IncomeTaxesPaidNet

us-gaap:IncreaseDecreaseInIncomeTaxes

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInUnearnedPremiums
us-gaap:ProductOrService
us-gaap:InterestPaid
us-gaap:ProductOrService
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
us-gaap:ProductOrService
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
us-gaap:ProductOrService
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss
us-gaap:FairValueByAssetClass, us-gaap:ReinsurancePolicyType
us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType
us-gaap:ProductOrService
us-gaap:ReinsurancePolicyType

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense
us-gaap:ConsolidationItems
us-gaap:ProductOrService
us-gaap:OperatingExpenses
us-gaap:ConsolidationItems
us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:IncomeStatementLocation, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:IncomeStatementLocation, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingLeaseLeaseIncome
us-gaap:ProductOrService

us-gaap:OperatingLeaseLeaseIncomeLeasePayments

us-gaap:OperatingLeaseVariableLeaseIncome

us-gaap:OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeOtherNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
us-gaap:ProductOrService
us-gaap:OtherExpenses

us-gaap:OtherNoncashIncomeExpense
us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType
us-gaap:PaymentsForLossesAndLossAdjustmentExpense
us-gaap:ProductOrService

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireLoansReceivable

us-gaap:ProceedsFromCollectionOfLoansReceivable

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, dei:LegalEntity
us-gaap:RepaymentsOfDebt
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType, dei:LegalEntity

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueNotFromContractWithCustomer
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
us-gaap:FairValueByAssetClass, us-gaap:ReinsurancePolicyType
us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType
us-gaap:ProductOrService
us-gaap:ReinsurancePolicyType
us-gaap:StatementClassOfStock
us-gaap:TreasuryStockSharesAcquired
us-gaap:ProductOrService
brka:AccountsAndOtherReceivablesNet
us-gaap:ProductOrService
brka:AircraftRepurchaseLiabilitiesAndDeferredRevenueLeasesNet
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
brka:EquityDerivativeIntrinsicValue

brka:EquitySecuritiesAccumulatedUnrealizedGainLoss
us-gaap:EquitySecuritiesByIndustry

brka:IncomeTaxesPrincipallyDeferred

brka:InventoryWorkInProcessAndOtherInventoryNetOfReserves

brka:LiabilityForUnpaidClaimsAndClaimAdjustmentExpenseRetroactiveReinsuranceContracts
us-gaap:ProductOrService

brka:OtherInventoryPurchasedGoodsNetOfReserves
us-gaap:ProductOrService
brka:USTreasuryBills

brka:UnamortizedDeferredChargesOnReinsuranceAssumed
us-gaap:CounterpartyName, us-gaap:ReinsurancePolicyType, dei:LegalEntity
us-gaap:ProductOrService
us-gaap:StatementClassOfStock
dei:EntityCommonStockSharesOutstanding
us-gaap:ProductOrService
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
us-gaap:ProductOrService
us-gaap:AccountsReceivableGross

us-gaap:AdditionalPaidInCapitalCommonStock
us-gaap:ProductOrService
us-gaap:AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:InvestmentType
us-gaap:CashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService
us-gaap:DebtAndCapitalLeaseObligations
us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService, dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, dei:LegalEntity
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtInstrumentFairValue
us-gaap:ProductOrService, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService
us-gaap:DebtWeightedAverageInterestRate
us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService, dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument, dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeAssets
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:ValuationTechnique
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService, us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeLiabilityNotionalAmount
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationAssets
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationLiabilities
us-gaap:ProductOrService
us-gaap:EquityMethodInvestments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentsFairValueDisclosure
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EquitySecuritiesFvNi
dei:LegalEntity
us-gaap:EquitySecuritiesByIndustry
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService

us-gaap:EquitySecuritiesFvNiCost
us-gaap:EquitySecuritiesByIndustry
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
us-gaap:EquitySecuritiesFvNiMeasurementInput
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs

us-gaap:FinancingReceivableAllowanceForCreditLosses

us-gaap:FinancingReceivableBeforeAllowanceForCreditLossAndFee
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus
us-gaap:ProductOrService
us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:ProductOrService, brka:FiniteLivedAndAndIndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:ProductOrService, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:ProductOrService
us-gaap:IntangibleAssetsGrossExcludingGoodwill
us-gaap:ProductOrService, brka:FiniteLivedAndAndIndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:ProductOrService, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:LiabilityForFuturePolicyBenefits

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
us-gaap:CounterpartyName, us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LoansReceivableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:NotesReceivableNet
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:OtherAssets
us-gaap:ProductOrService
us-gaap:OtherReceivables
us-gaap:ProductOrService
us-gaap:PolicyholderFunds
us-gaap:ProductOrService
us-gaap:PremiumsAndOtherReceivablesNet
us-gaap:ProductOrService
us-gaap:PremiumsReceivableGross

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseNet
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:RegulatoryAssets
us-gaap:ProductOrService
us-gaap:RegulatoryLiabilities

us-gaap:ReinsuranceRecoverablesOnUnpaidLossesGross
us-gaap:ProductOrService

us-gaap:RestrictedCashAndCashEquivalents
us-gaap:ProductOrService
us-gaap:RevenueRemainingPerformanceObligation
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ShortTermBorrowings
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ShortTermDebtWeightedAverageInterestRate
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, dei:LegalEntity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:TreasuryStockShares
us-gaap:ProductOrService
us-gaap:UnbilledContractsReceivable
us-gaap:ProductOrService
us-gaap:UnearnedPremiums
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, dei:LegalEntity
us-gaap:UnsecuredDebt

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
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us-gaap:StockholdersEquity ▇█▇▇▇▆▇▆▆▆▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁371565424791397609382544368877348703375606358094347401348296308278300659292851283001269264263025258661255550248283246043241458240170237456234005227612221890208382208382202016198071187647184602177379175997164850159957163007160055157318NANANA131102NANANA
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us-gaap:TreasuryStockValue █▇▅▅▄▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁970081255937524247993109269117631763176317631763176317631763176317631763176317631763176317631763136313631363136313631363136367676767NANANANANANANANANANANA
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us-gaap:NetIncomeLoss ▁█▇▆▇▃▇▆▅█▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▅▆▅▅▆▅▆▅▅▆▅▆▆▅-4974629159165241407321661-253921854012011-11383255140674262406062867198500155895478942840135164415546176395470549905053505345414892455139203108324530482278341715114377298919683633305632383295-1534
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Common Stock Value

Common Stock Par Or Stated Value Per Share

Common Stock Shares Issued

us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesIssued

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-312008-12-31
Value0000000000000000000000000000000000011
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonClassB



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-312008-12-31
Value14141408140113821380137313671349134613421336131513141303128812601256125312491248122812261213118711811178117011401128112310961084107810691050744735
Percentage of CommonStockSharesIssued197844.1195769.5193702.9187792.3187038.5185062.6183395.0177955.3177286.1175949.9174389.5168723.7168361.8165384.3161606.0154539.2153535.7152891.5151832.4151590.7146883.4146329.1143470.9137576.4136240.6135707.3133873.6127607.1125153.2124196.7118975.1116762.2115649.3113993.1110927.270569.069438.1

Common Stock Shares Outstanding

us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesOutstanding

brka:EquivalentClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value11111111111
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value00000000000000000000000000000000000000111
Percentage of CommonStockSharesOutstanding43.043.243.544.244.344.444.745.445.545.70.00.00.047.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value13851384138413681367136713621347134513401335131413131301128712591255125212481246122712241212118611801177116811391127112110951084107710681067106510601050744735700
Percentage of CommonStockSharesOutstanding85525.285201.184824.983735.783618.083332.182958.681931.881790.581506.50.00.00.079176.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Authorized

Weighted Average Number Of Shares Outstanding Basic

us-gaap:StatementClassOfStock

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

brka:EquivalentClassA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value11111111111
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:EquivalentClassB



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value243424492452245924652467246724662466
Percentage of WeightedAverageNumberOfSharesOutstandingBasic150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0150000.0

Earnings Per Share Basic

us-gaap:StatementClassOfStock

us-gaap:EarningsPerShareBasic

brka:EquivalentClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-30653.017909.010119.08608.013209.0-15467.011280.07301.0-692.019790.02473.02592.02469.03823.04379.03042.03401.0
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:EquivalentClassB



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-20.4411.9199999999999986.755.748.81-10.297.524.87-0.4613.21.651.731.65
Percentage of EarningsPerShareBasic0.10.10.10.10.10.10.10.10.10.10.10.10.1

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value61265653686497263598606786371463450622005847358907605255751865187583445906854460524035182058989513684864448259511994976245453470494654146541446934386744720410503854638147379553373938274337203616536274317093203730198299042960722784
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax147.8100.0143.8143.0143.1100.0139.7140.5140.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

brka:CorporateReconcilingItemsAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value133962401391442183816-22-478-52-133-71-383-183-132-7-337-236-380
Percentage of Revenues0.20.10.40.20.20.30.10.0-0.0-0.8-0.1-0.2-0.1-0.7-0.3-0.2-0.0-0.7-0.4-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.10.50.30.30.30.10.0-0.1-0.8-0.1-0.2-0.1-0.7-0.3-0.2-0.0-0.7-0.4-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:CorporateReconcilingItemsAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value611326527264732634596053463496634126218458495592225961257426644835573455418535435113050514516255156047144481175124047326440084525744466444664384742188422184020239408
Percentage of Revenues99.899.999.699.899.899.799.9100.0100.0100.598.599.898.995.593.898.397.697.587.5100.496.999.7100.195.196.896.295.598.196.294.497.9102.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax147.599.9143.3142.7142.899.7139.6140.5140.9100.598.599.898.995.593.898.397.697.587.5100.496.999.7100.195.196.896.295.595.598.196.294.497.9102.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, brka:BerkshireHathawayEnergyCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value45074752572049704672471957065050451246895370462342574244519842994118421351444543433142704853418543063179339230563116
Percentage of Revenues7.47.38.87.87.77.49.08.17.78.08.98.06.57.38.87.97.98.18.78.88.98.89.58.49.56.87.36.87.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.97.312.711.211.07.412.611.410.98.08.98.06.57.38.87.97.98.18.78.88.98.89.58.49.56.87.36.87.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1739618258171121651715806170231577915548145861437514597136512288513688124071203512273119281156011738106301075813674108241036710329103541035410358103781023998329827
Percentage of Revenues28.427.926.326.026.026.724.925.024.924.424.123.735.123.521.022.123.423.019.622.921.922.326.721.822.822.022.223.223.722.924.025.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.027.937.937.237.326.734.735.135.124.424.123.735.123.521.022.123.423.019.622.921.922.326.721.822.822.022.222.223.223.722.924.025.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BurlingtonNorthernSantaFeCorporation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value541758396021589357626206614758785624563853145250518553105167458547675396560053695602617658815735544757575651565153225284542853435062
Percentage of Revenues8.88.99.39.39.59.79.79.59.69.68.89.18.09.18.78.49.110.49.510.511.512.811.511.512.012.212.111.912.012.113.013.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.18.913.313.313.69.713.513.313.59.68.89.18.09.18.78.49.110.49.510.511.512.811.511.512.012.212.112.111.912.012.113.013.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BurlingtonNorthernSantaFeCorporation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1503515557158971620615070215441355213853129341279112819127381209711669120821220110554856891819524886389859534961386418397880488968161
Percentage of Revenues24.523.824.525.524.833.821.422.322.121.721.222.118.620.020.522.420.116.515.618.518.218.618.619.319.017.818.919.918.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.323.835.236.535.533.829.831.331.221.721.222.118.620.020.522.420.116.515.618.518.218.618.619.319.017.818.919.918.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:ManufacturingBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:McLaneCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1182113244126041241112199125491282212427121891229512798125811210111954122711204911801120231226412293116431231312151117221045412223115471154711375107851082695349004
Percentage of Revenues19.320.319.419.520.119.720.220.020.820.921.121.918.620.520.822.122.523.220.823.923.925.523.723.623.026.024.825.524.624.223.223.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.520.327.927.928.819.728.228.129.420.921.121.918.620.520.822.122.523.220.823.923.925.523.723.623.026.024.824.825.524.624.223.223.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:McLaneCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value6956762273787462702583166974706265877143652765506093687163316385589165006151629445213820349336053358
Percentage of Revenues11.411.711.411.711.613.111.011.411.312.110.811.49.311.810.711.711.212.510.412.39.37.96.87.27.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.811.716.316.816.613.115.416.015.912.110.811.49.311.810.711.711.212.510.412.39.37.96.87.27.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:ServiceAndRetailingBusinesses0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value513785483553270527775028159713492014893946311465604718145709534564507443911435984264040063474213965135880
Percentage of Revenues83.983.982.083.082.993.777.578.779.279.078.079.582.077.374.380.181.477.380.477.273.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax123.983.9117.9118.7118.693.7108.3110.6111.679.078.079.582.077.374.380.181.477.380.477.273.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther160.90.0156.6154.6155.10.0148.0147.2145.30.0147.2144.0176.80.0143.8142.7150.80.0172.8142.7143.9

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value988710533117021082110397108581181810895101021004410652984394049516103308851884595501069798669891
Percentage of Revenues16.116.118.017.017.117.018.617.517.317.117.617.114.416.317.516.316.918.418.119.220.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.916.125.924.324.517.026.024.624.317.117.617.114.416.317.516.316.918.418.119.220.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CargoAndFreight



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value538057995982585157256156611258455590
Percentage of Revenues8.88.99.29.29.49.79.69.49.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.08.913.213.213.59.713.513.213.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CargoAndFreight0.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

brka:BerkshireHathawayEnergyCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value450747345720497046724702570650504512
Percentage of Revenues7.47.28.87.87.77.49.08.17.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.97.212.711.211.07.412.611.410.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:BerkshireHathawayEnergyCompany104.60.0105.8106.8105.90.0105.5106.3106.8

brka:BurlingtonNorthernSantaFeCorporation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value538057995982585157256156611258455590
Percentage of Revenues8.88.99.29.29.49.79.69.49.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.08.913.213.213.59.713.513.213.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:BurlingtonNorthernSantaFeCorporation100.30.0100.3100.2100.20.0100.2100.2100.2

brka:InsuranceCorporateAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value176051849617431167351602017378158951568114650
Percentage of Revenues28.728.326.826.326.427.325.125.225.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.528.338.637.637.827.335.035.435.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceCorporateAndOther0.00.00.00.00.00.00.00.00.0

brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value150141549415881161911505821489135291591112912
Percentage of Revenues24.523.724.425.524.833.721.325.622.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.223.735.236.435.533.729.836.031.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ManufacturingBusinesses106.20.0106.3106.0106.10.0100.4104.993.0

brka:McLaneCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value118211324412604124111219912549128221242712189
Percentage of Revenues19.320.319.419.520.119.720.220.020.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.520.327.927.928.819.728.228.129.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:McLaneCompany100.20.0100.2100.2100.20.0100.1100.2100.1

brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value693876017354744070048297695572866560
Percentage of Revenues11.311.611.311.711.513.011.011.711.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.711.616.316.716.513.015.316.515.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:ServiceAndRetailingBusinesses118.70.0117.2118.0118.80.0112.0119.6116.2

Premiums Earned Net

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:PremiumsEarnedNet

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup, brka:BerkshireHathawayPrimaryGroup



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value236923402387228721512190205019531918185618521759167616761629151114411446142913091210123611391049953946867816
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.73.65.35.15.13.44.54.44.63.23.13.12.62.92.82.82.72.82.42.52.52.62.22.12.12.01.91.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup brka:BerkshireHathawayPrimaryGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup, brka:BerkshireHathawayReinsuranceGroup



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value42705148394037073546471537773912354080622324178611841273718721652224318901892197814471702480915832022186822191903
Percentage of PremiumsEarnedNet180.2220.0165.1162.1164.9215.3184.2200.3184.6434.4125.5101.5706.5163.3114.9109.3155.7130.7132.4151.1119.6137.7422.2150.9212.2197.5255.9233.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.37.98.78.38.47.48.38.88.513.73.83.118.24.73.23.04.33.63.23.93.03.59.43.24.44.04.84.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup brka:BerkshireHathawayReinsuranceGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup, brka:Geico



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value9109908589968869862286588506828479157809754372446845671264746247605059265788561953855328520350814884484647304597
Percentage of PremiumsEarnedNet384.5388.2376.9387.8400.8395.3414.9424.2412.7420.7407.3411.8408.4400.5397.4413.4419.8409.8405.0429.3445.0431.1456.8484.4512.5512.3545.6563.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.013.919.919.920.313.618.718.719.113.312.512.610.511.511.011.511.511.49.810.911.111.010.210.210.710.310.210.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments brka:BerkshireHathawayInsuranceGroup brka:Geico0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value15748165731532314863143191556314333141491337313128133491236721753125941136410799111241084010514104009540
Percentage of PremiumsEarnedNet664.8708.2641.9649.9665.7710.6699.2724.5697.2707.3720.8703.11297.9751.4697.6714.7772.0749.7735.8794.5788.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.025.433.933.433.824.431.632.032.222.322.121.533.421.619.219.821.220.917.820.219.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther49.30.045.043.644.20.043.142.541.90.041.639.072.00.037.235.439.30.038.337.438.3

Other Income

Policyholder Benefits And Claims Incurred Net

General And Administrative Expense

Selling General And Administrative Expense

us-gaap:ProductOrService

us-gaap:SellingGeneralAndAdministrativeExpense

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value447156774384482944326080398441504024414039654020411647313959406637223546372133783078
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.88.79.710.910.59.58.89.49.77.06.67.06.38.16.77.57.16.86.36.66.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther14.00.012.914.113.70.012.012.512.60.012.412.713.60.013.013.313.20.013.612.212.3

Interest Expense

us-gaap:ConsolidationItems

us-gaap:InterestExpense

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1361049610710938160-320337251386646211-288201-31348
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.20.20.20.30.60.1-0.70.80.40.61.10.3-0.50.3-0.10.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value296266261267262263252255390335435700270-229259283871188217144
Percentage of InterestExpense217.6255.8271.9249.5240.469.0420.0-79.7115.7133.5112.7108.4128.079.5128.9-90.3111.20.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.40.60.60.60.40.60.60.90.60.71.20.4-0.40.40.10.70.00.10.40.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:InsuranceAndOther0.90.00.80.80.80.00.80.81.20.01.42.20.90.00.80.11.40.00.30.80.6

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7287277247257297086987027101164700697693680681596685696672653632
Percentage of InterestExpense535.3699.0754.2677.6668.8185.81163.3-219.4210.7463.7181.3107.9328.4-236.1338.8-1922.6196.80.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.81.11.61.61.71.11.51.61.72.01.21.21.11.21.21.11.31.31.11.31.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-6334936561198451763527479-295102283114771-1924425353785820544990621030071666216586767508916659872327378737868917295675459364615493144523363526522346481453429385098
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-152.855.943.939.764.8-46.350.333.4-4.67.28.910.18.415.517.413.211.912.213.217.914.515.415.915.915.416.615.114.512.012.911.710.013.86.617.912.59.315.9

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-6304936801204891775927647-327212314715098-1523639156306129568893141052573726456738114072584676475841675089166598
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-152.156.345.439.965.2-51.451.034.1-3.710.89.310.78.716.017.813.512.314.223.911.415.712.113.217.914.5

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-133527571383235865915-733044403021-452-262651427177415492959319222907991834454517392414162320292458182521692225222522792278209318821384156512619531725629200814158481336
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-32.211.68.58.114.0-11.59.86.8-1.1-44.62.43.12.45.15.44.21.53.57.73.45.03.44.04.94.04.64.84.85.15.24.74.63.64.13.32.84.51.95.63.92.74.2

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-4974629159165241407321661-253921854012011-11383255140674262406062867198500155895478942840135164415546176395470549905053505345414892455139203108324530482278341715114377298919683633305632383295-1534
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-120.044.636.631.751.1-39.940.827.1-2.755.36.77.46.210.812.29.210.710.616.07.810.68.69.012.910.410.610.910.910.211.210.29.58.18.58.06.88.94.512.18.26.211.310.110.811.1-6.7

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value760448817729788482760108738724707794736459711932702651702095681554665590654451620854604038592816586315552257545468540774531076526186517363504379494944484931458081446563442302427452424115411356411362392647385494382696376496372229297119
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value573001630572603016577583558132532307520749497899488106485797464916451341440115409328392454384147386938348282
Percentage of Assets75.477.176.576.075.675.270.769.969.569.268.267.867.265.965.064.866.063.1
Percentage of Assets75.477.176.576.075.675.270.769.969.569.268.267.867.265.965.064.866.063.1
Percentage of Assets brka:InsuranceAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value187447187157185466182525180592175487177422175870175082174413176333173369172269169816169672167400165363165012
Percentage of Assets24.622.923.524.024.424.824.124.724.924.825.926.026.327.428.128.228.229.9
Percentage of Assets24.622.923.524.024.424.824.124.724.924.825.926.026.327.428.128.228.229.9
Percentage of Assets brka:RailroadUtilitiesAndEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value385213389166386924373717366133355294357040350174351599350141369702361497358171334495331423326558324478293630294147291572286237283159277061267619264655260446246650241575240196235864235041229641231093223686221613215912212231209295161334
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets50.747.649.149.249.650.248.549.250.049.954.254.354.753.954.955.155.353.253.953.953.953.853.653.153.553.753.854.154.355.255.455.856.257.057.556.456.456.254.3

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value244628234570238754227533223764222488201718199647200130195784190183184261181478163193163296159699159512140553
Percentage of Liabilities63.560.361.760.961.162.656.557.056.955.951.451.050.748.849.348.949.247.9
Percentage of Assets32.228.730.329.930.331.427.428.028.527.927.927.727.726.327.026.927.225.5
Percentage of Assets brka:InsuranceAndOther42.737.239.639.440.141.838.740.141.040.340.940.841.239.941.641.641.240.4

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value880148779787781865628551781431815918139481052810237600475130750517364073495732547242572766
Percentage of Liabilities22.822.622.723.223.422.922.923.223.123.120.620.821.022.022.222.422.324.8
Percentage of Assets11.610.711.111.411.611.511.111.411.511.511.211.311.511.912.212.412.413.2
Percentage of Assets brka:RailroadUtilitiesAndEnergy47.046.947.347.447.446.446.046.346.346.543.143.343.643.443.343.843.844.1

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value760448817729788482760108738724707794736459711932702651702095681554665590654451620854604038592816586315552257545468540774531076526186517363504379494944484931458081446563442302427452424115411356411362392647385494382696376496372229297119
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value371565424791397609382544368877348703375606358094347401348296308278300659292851283001269264263025258661255550248283246043241458240170237456234005227612221890208382202016198071187647184602177379175997164850159957163007160055157318131102
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets48.951.950.450.349.949.351.050.349.449.645.245.244.745.644.644.444.146.345.545.545.545.645.946.446.045.845.545.244.843.943.543.142.842.041.542.642.542.344.1

us-gaap:StatementEquityComponents

brka:OtherAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-57-952234-612-17
Percentage of StockholdersEquity-0.0-0.00.00.00.0-0.00.0-0.0
Percentage of Assets-0.0-0.00.00.00.0-0.00.0-0.0
Percentage of Assets brka:OtherAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-1298-1369-783-766-816-341-420-593
Percentage of StockholdersEquity-0.3-0.3-0.2-0.2-0.2-0.1-0.1-0.2
Percentage of Assets-0.2-0.2-0.1-0.1-0.1-0.0-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value3424815074633703756209343176
Percentage of StockholdersEquity0.10.10.10.10.10.117.815.3
Percentage of Assets0.00.10.10.10.10.18.87.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-6721-5243-5408-4727-5015-39275857137298
Percentage of StockholdersEquity-1.8-1.2-1.4-1.3-1.4-1.016.813.2
Percentage of Assets-0.9-0.6-0.7-0.6-0.7-0.58.36.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-5708-4346-5137-4446-4603-3955-3114-5268
Percentage of StockholdersEquity-1.5-1.0-1.3-1.2-1.3-1.1-0.9-1.9
Percentage of Assets-0.8-0.5-0.7-0.6-0.7-0.5-0.4-0.8
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:ProductOrService

us-gaap:CashAndCashEquivalentsAtCarryingValue

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value38717611517106441375224872774936506579185055925460352472014218362235816826961788535876118156166603945819857974
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.17.59.05.43.03.95.08.17.23.65.23.02.83.811.310.49.111.110.311.211.011.0
Percentage of Assets brka:InsuranceAndOther6.89.711.87.24.05.27.011.610.45.27.64.54.25.817.416.113.817.60.00.00.00.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value3923302437123259365226123297336335502910444849625584393938933036269234374691386035223001
Percentage of CashAndCashEquivalentsAtCarryingValue10.14.95.27.916.29.49.05.87.011.412.624.630.416.75.74.95.05.68.46.46.15.2
Percentage of Assets0.50.40.50.40.50.40.40.50.50.40.70.70.90.60.60.50.50.60.90.70.70.6
Percentage of Assets brka:RailroadUtilitiesAndEnergy2.11.62.01.82.01.51.91.92.01.72.52.93.22.32.31.81.62.10.00.00.00.0

Inventory Net

us-gaap:InventoryNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2017219852199511983419454190691679316194162441618716931164421611515727157631572015837119161199512072116811023610182101991024599459880987796739675947695259055897592657960756471016147
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.42.52.62.62.72.32.32.32.32.52.52.52.52.62.72.72.22.22.22.21.92.02.02.12.12.22.22.22.32.22.32.22.32.42.12.01.92.1

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value201721985219951198341945419069167931619416244161871693116442161151572715763157201583711916
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.42.52.62.62.72.32.32.32.32.52.52.52.52.62.72.72.2
Percentage of Assets brka:InsuranceAndOther3.53.13.33.43.53.63.23.33.33.33.63.63.73.84.04.14.13.4

Inventory Finished Goods

Land

Machinery And Equipment Gross

Property Plant And Equipment Gross

us-gaap:ProductOrService

us-gaap:PropertyPlantAndEquipmentGross

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value421584221041560412164040839827448724395743471374243697136366357913501134965340303345729617
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.55.25.35.45.55.66.16.26.25.35.45.55.55.65.85.75.75.4
Percentage of Assets brka:InsuranceAndOther7.46.76.97.17.27.58.68.88.97.78.08.18.18.68.98.98.68.5

brka:Railroad



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value767987663475514747827408773189723967176671285709407026069578689726738066570658986503564355
Percentage of PropertyPlantAndEquipmentGross182.2181.6181.7181.4183.3183.8161.3163.3164.0189.6190.0191.3192.7192.5190.4193.6194.4217.3
Percentage of Assets10.19.49.69.810.010.39.810.110.110.110.310.510.510.911.011.111.111.7
Percentage of Assets brka:Railroad0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value101322101841100118985769691296246949269356192655918919080888937875398717286413853738510084256
Percentage of PropertyPlantAndEquipmentGross240.3241.3240.9239.2239.8241.7211.5212.8213.1245.5245.6244.6244.6249.0247.1250.9254.4284.5
Percentage of Assets13.312.512.713.013.113.612.913.113.213.113.313.413.414.014.314.414.515.3
Percentage of Assets brka:UtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProductOrService, us-gaap:PropertyPlantAndEquipmentByType

brka:InsuranceAndOther, brka:FurnitureFixturesAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value465046665064522150494758497246954493438747054395421440804419431842133545
Percentage of PropertyPlantAndEquipmentGross11.011.112.212.712.511.911.110.710.311.712.712.111.811.712.612.712.612.0
Percentage of Assets0.60.60.60.70.70.70.70.70.60.60.70.70.60.70.70.70.70.6
Percentage of Assets brka:InsuranceAndOther brka:FurnitureFixturesAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:InsuranceAndOther, us-gaap:LandBuildingsAndImprovements



Period End2020-03-312019-12-31
Value1327713259
Percentage of PropertyPlantAndEquipmentGross31.531.4
Percentage of Assets1.71.6
Percentage of Assets brka:InsuranceAndOther us-gaap:LandBuildingsAndImprovements0.00.0

brka:InsuranceAndOther, us-gaap:MachineryAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value242312428523409229652268222574285942793227707219352140921220209832046320103195501920417054
Percentage of PropertyPlantAndEquipmentGross57.557.556.355.756.156.763.763.563.758.657.958.458.658.457.557.457.457.6
Percentage of Assets3.23.03.03.03.13.23.93.93.93.13.13.23.23.33.33.33.33.1
Percentage of Assets brka:InsuranceAndOther us-gaap:MachineryAndEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:Railroad, brka:LandTrackStructureAndOtherRoadway



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6264362404613456079560328595095875557408
Percentage of PropertyPlantAndEquipmentGross148.6147.8147.6147.5149.3149.4130.9153.4
Percentage of Assets8.27.67.88.08.28.48.08.2
Percentage of Assets brka:Railroad brka:LandTrackStructureAndOtherRoadway0.00.00.00.00.00.00.00.0

brka:Railroad, brka:LocomotivesFreightCarsAndOtherEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value133821348213381132641318513016127311264012600125431245912264121721207511860117581151511320
Percentage of PropertyPlantAndEquipmentGross31.731.932.232.232.632.728.428.829.033.533.733.734.034.533.934.634.438.2
Percentage of Assets1.81.61.71.71.81.81.71.81.81.81.81.81.91.92.02.02.02.0
Percentage of Assets brka:Railroad brka:LocomotivesFreightCarsAndOtherEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:Railroad, us-gaap:ConstructionInProgress



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value77374878872357466491010399439899278968109651064113110311031
Percentage of PropertyPlantAndEquipmentGross1.81.81.91.81.41.72.02.42.22.62.52.52.32.83.03.33.13.5
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.20.20.2
Percentage of Assets brka:Railroad us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy, brka:UtilityGenerationTransmissionAndDistributionSystems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value805308112778596780877765977288757517497575068746607313872317713087153670316699556988069248
Percentage of PropertyPlantAndEquipmentGross191.0192.2189.1189.5192.2194.1168.8170.6172.7199.5197.8198.9199.2204.3201.1205.6208.9233.8
Percentage of Assets10.69.910.010.310.510.910.310.510.710.610.710.910.911.511.611.811.912.5
Percentage of Assets brka:UtilitiesAndEnergy brka:UtilityGenerationTransmissionAndDistributionSystems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy, us-gaap:ConstructionInProgress



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value381937325313433133883110372432042735255635032607235020983175270127572627
Percentage of PropertyPlantAndEquipmentGross9.18.812.810.58.47.88.37.36.36.89.57.26.66.09.17.98.28.9
Percentage of Assets0.50.50.70.60.50.40.50.50.40.40.50.40.40.30.50.50.50.5
Percentage of Assets brka:UtilitiesAndEnergy us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy, us-gaap:OtherEnergyEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value879288178572858783188324815681427622749971767044693765966056588256655626
Percentage of PropertyPlantAndEquipmentGross20.920.920.620.820.620.918.218.517.520.019.419.419.418.817.317.316.919.0
Percentage of Assets1.21.11.11.11.11.21.11.11.11.11.11.11.11.11.01.01.01.0
Percentage of Assets brka:UtilitiesAndEnergy us-gaap:OtherEnergyEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy, us-gaap:Pipelines



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value818181657637757175477524729572407230717669916969694469426866683567986755
Percentage of PropertyPlantAndEquipmentGross19.419.318.418.418.718.916.316.516.619.218.919.219.419.819.620.120.322.8
Percentage of Assets1.11.01.01.01.01.11.01.01.01.01.01.01.11.11.11.21.21.2
Percentage of Assets brka:UtilitiesAndEnergy us-gaap:Pipelines0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:ProductOrService

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value209002077220330200121958319199205152000919664173201702516576161461568615639149581449914077
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.52.62.62.72.72.82.82.82.52.52.52.52.52.62.52.52.5
Percentage of Assets brka:InsuranceAndOther3.63.33.43.53.53.63.94.04.03.63.73.73.73.84.03.93.74.0

brka:Railroad



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value121981210111512112061086510004959692598954862782937936758361305673537051354845
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment58.458.356.656.055.552.146.846.345.549.848.747.947.039.136.335.935.434.4
Percentage of Assets1.61.51.51.51.51.41.31.31.31.21.21.21.21.00.90.90.90.9
Percentage of Assets brka:Railroad0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:UtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value286582853628794286372796427651273392685226601260202582925251246512466324305239242394823487
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment137.1137.4141.6143.1142.8144.0133.3134.2135.3150.2151.7152.3152.7157.2155.4159.9165.2166.8
Percentage of Assets3.83.53.73.83.83.93.73.83.83.73.83.83.84.04.04.04.14.3
Percentage of Assets brka:UtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:ProductOrService

us-gaap:PropertyPlantAndEquipmentNet

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value212582143821230212042082520628243572394823807201041994619790196451932519326190721895815540
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.82.62.72.82.82.93.33.43.42.92.93.03.03.13.23.23.22.8
Percentage of Assets brka:InsuranceAndOther3.73.43.53.73.73.94.74.84.94.14.34.44.54.74.95.04.94.5

brka:Railroad



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value646006453364002635766322263185628006250762331623136196761642613896125060897605285990059510
Percentage of PropertyPlantAndEquipmentNet303.9301.0301.5299.8303.6306.3257.8261.0261.8310.0310.7311.5312.5316.9315.1317.4316.0382.9
Percentage of Assets8.57.98.18.48.68.98.58.88.98.99.19.39.49.910.110.210.210.8
Percentage of Assets brka:Railroad0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value137264137838135326133515132170131780130387129216128385128184126946125328124277123759123005121977121052120279
Percentage of PropertyPlantAndEquipmentNet645.7643.0637.4629.7634.7638.8535.3539.6539.3637.6636.4633.3632.6640.4636.5639.6638.5774.0
Percentage of Assets18.116.917.217.617.918.617.718.218.318.318.618.819.019.920.420.620.621.8
Percentage of Assets brka:RailroadUtilitiesAndEnergy73.273.673.073.173.275.173.573.573.373.572.072.372.172.972.572.973.272.9

brka:UtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value726647330571324699396894868595675876670966054658716497963686628886250962108614496115260769
Percentage of PropertyPlantAndEquipmentNet341.8341.9336.0329.8331.1332.5277.5278.6277.5327.7325.8321.8320.1323.5321.4322.2322.6391.0
Percentage of Assets9.69.09.09.29.39.79.29.49.49.49.59.69.610.110.310.410.411.0
Percentage of Assets brka:UtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value81659818828122881269812208102581327812508133781258808828017579951794867939279177791146270862692627996287960714586695879258264570115473554372544075452354143531455316653213533104912549080490063397233781
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.710.010.310.711.011.411.011.411.611.611.912.012.212.813.113.413.511.411.511.611.811.511.311.711.811.811.912.212.312.812.812.912.913.613.812.813.013.211.40.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value569905705256478564875644956323549855495555079549855458454471543335399453832535645352337188
Percentage of Goodwill69.869.769.569.569.569.567.667.667.767.767.567.968.067.967.867.767.759.3
Percentage of Assets7.57.07.27.47.68.07.57.77.87.88.08.28.38.78.99.09.16.7
Percentage of Assets brka:InsuranceAndOther9.99.09.49.810.110.610.611.011.311.311.712.112.313.213.713.913.810.7

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value246692483024750247822477124702247902477224766247802480224306242342411124186242412424624178
Percentage of Goodwill30.230.330.530.530.530.530.530.530.430.530.730.330.330.330.530.630.638.6
Percentage of Assets3.23.03.13.33.43.53.43.53.53.53.63.73.73.94.04.14.14.4
Percentage of Assets brka:RailroadUtilitiesAndEnergy13.213.313.313.613.714.114.014.114.114.214.114.014.114.214.314.514.714.7

Intangible Assets Net Excluding Goodwill

us-gaap:ProductOrService

us-gaap:IntangibleAssetsNetExcludingGoodwill

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value30693310513078831032312663149931626319253226032518329743322033472334813503435179352679148
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.03.83.94.14.24.54.34.54.64.64.85.05.15.45.85.96.01.7
Percentage of Assets brka:InsuranceAndOther5.44.95.15.45.65.96.16.46.66.77.17.47.68.28.99.29.12.6

Deferred Tax Assets Liabilities Net

Accrued Income Taxes Current

Minority Interest

us-gaap:MinorityInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value367037723949384737143797381336643651365835743434342933583351323331763077303831593381285728462755267725953049297240353941447243364272411139243777421056164683
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.50.50.50.50.50.50.50.50.50.50.50.50.60.50.50.60.60.60.60.50.60.50.50.50.70.70.90.91.11.11.01.01.01.01.11.51.6

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value371565424791397609382544368877348703375606358094347401348296308278300659292851283001269264263025258661255550248283246043241458240170237456234005227612221890208382202016198071187647184602177379175997164850159957163007160055157318131102
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets48.951.950.450.349.949.351.050.349.449.645.245.244.745.644.644.444.146.345.545.545.545.645.946.446.045.845.545.244.843.943.543.142.842.041.542.642.542.344.1

us-gaap:StatementEquityComponents

brka:OtherAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-57-952234-612-17
Percentage of StockholdersEquity-0.0-0.00.00.00.0-0.00.0-0.0
Percentage of Assets-0.0-0.00.00.00.0-0.00.0-0.0
Percentage of Assets brka:OtherAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-1298-1369-783-766-816-341-420-593
Percentage of StockholdersEquity-0.3-0.3-0.2-0.2-0.2-0.1-0.1-0.2
Percentage of Assets-0.2-0.2-0.1-0.1-0.1-0.0-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value3424815074633703756209343176
Percentage of StockholdersEquity0.10.10.10.10.10.117.815.3
Percentage of Assets0.00.10.10.10.10.18.87.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-6721-5243-5408-4727-5015-39275857137298
Percentage of StockholdersEquity-1.8-1.2-1.4-1.3-1.4-1.016.813.2
Percentage of Assets-0.9-0.6-0.7-0.6-0.7-0.58.36.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-5708-4346-5137-4446-4603-3955-3114-5268
Percentage of StockholdersEquity-1.5-1.0-1.3-1.2-1.3-1.1-0.9-1.9
Percentage of Assets-0.8-0.5-0.7-0.6-0.7-0.5-0.4-0.8
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.0

Common Stock Value

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3523594024933733343568463427733211123465033279633159522557862241662200992158372117772054911982931932921877031822251727971687841636201594651548481484531437481387581337051291641242721197211158011126931094481064001041221007059919486227
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.349.247.346.946.445.447.046.145.036.432.933.133.034.134.033.433.034.033.432.031.831.130.830.730.029.630.329.929.229.128.228.227.427.927.627.226.726.629.0

us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201613



Period End2020-01-01
Value-388
Percentage of RetainedEarningsAccumulatedDeficit0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:AccountingStandardsUpdate2016130.0

Treasury Stock Value

us-gaap:TreasuryStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value97008125593752424799310926911763176317631763176317631763176317631763176317631763176317631763176313631363136313631363136367676767
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.00.80.70.60.40.40.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.00.00.00.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-6721-5243-5408-4678-4727-5015-3927-3808-2477585715018346652430703729829798307773145433982322033941738864427324418645421450494402534897335653299227500270502378125517176541578121106217642058317793
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.9-0.6-0.7-0.6-0.6-0.7-0.5-0.5-0.48.37.47.06.66.04.95.25.46.25.97.37.38.18.59.09.19.17.67.57.56.46.45.86.24.54.15.55.85.56.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value6798120779848918575771084510464853575568277108778327182956481350235473313
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.418.521.820.717.917.023.019.318.214.118.014.528.116.910.411.210.3

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-27804-21077183647293-10201-21818-3346112222308-199456851-5465-225323322861-1529-15371
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-67.1-32.240.716.4-24.1-34.2-73.70.353.7-33.911.3-9.5-34.60.98.5-4.8-48.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-346-177920982089-1678-286-10-1722-3794469-1398-24842015-147-35593877194
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.8-2.74.64.7-4.0-0.4-0.0-3.9-9.10.8-2.3-4.33.1-0.4-10.61.222.5

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value6798120779848918575771084510464853575568277108778327182956481350235473313
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.418.521.820.717.917.023.019.318.214.118.014.528.116.910.411.210.3

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-4974629159165241407321661-253921854012011-11383255140674262406062867198500155895478942840135164415546176395470549905053505345414892455139203108324530482278341715114377298919683633305632383295-1534
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-120.044.636.631.751.1-39.940.827.1-2.755.36.77.46.210.812.29.210.710.616.07.810.68.69.012.910.410.610.910.910.211.210.29.58.18.58.06.88.94.512.18.26.211.310.110.811.1-6.7

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-4969729230166571417321732-253911870712077-10713265642034355413963557333508256575547952741075233421847216458477350635153515346125017466140543231336631912410354016054473311920903812
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value49133100711167666710513693796913581686999946963104636873100711251101341231211431321239496130122179
Percentage of ProfitLoss-0.10.80.70.3-0.00.90.5-6.30.33.22.11.91.11.81.61.21.21.02.31.31.52.21.01.41.41.91.52.52.43.33.83.64.55.53.55.92.14.25.84.7

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-49746165241407321661-253921854012011-1138325514067426240606286719850015589547894284013516441554617639547054990505345414892455139203108324530482278341715114377298919683633
Percentage of ProfitLoss100.199.299.399.7100.099.199.5106.399.796.897.998.198.998.298.498.898.899.097.798.798.597.899.098.698.698.198.597.597.696.796.296.495.594.596.594.197.995.894.295.3

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value25852657253424562417261023952387238723532296229622432296224622342125197819891941187119341854181017721675161616161601
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

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-27804-21077183647293-10201-21818-3346112222308-199456851-5465-225323322861-1529-15371
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-67.1-32.240.716.4-24.1-34.2-73.70.353.7-33.911.3-9.5-34.60.98.5-4.8-48.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value29684840439235963151449737113740258932973262279423553525328533012843427949673389344750134079329927943360296925512207258226142419216025182229196214821689157515461170
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Investments

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312011-06-302011-03-312010-06-302010-03-31
Value-346-177920982089-1678-286-10-1722-3794469-1398-24842015-147-35593877194
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.8-2.74.64.7-4.0-0.4-0.0-3.9-9.10.8-2.3-4.33.1-0.4-10.61.222.5

Proceeds From Issuance Of Long Term Debt

us-gaap:ProductOrService

us-gaap:ProceedsFromIssuanceOfLongTermDebt

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1613339652180199623542711172126921203467856185398718123241
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-31
Value4324123782439429450278062636132013993192094843231011123012541984
Percentage of ProceedsFromIssuanceOfLongTermDebt268.141233.320.818.1147.50.010296.35690.921252.9957.11534.6346.7174.11832.62.91162.16833.310450.061.2

Repayments Of Long Term Debt

us-gaap:ProductOrService

us-gaap:RepaymentsOfLongTermDebt

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1502492139962811473477942184093583501130-65777376738141321211722
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations brka:InsuranceAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value174887276259143155512301207122116051761322446244981259522675202212636
Percentage of RepaymentsOfLongTermDebt116.41779.63.6269.850.911.7157.92873.866.41725.830.22644.039.5-37.112.7164.1137.01646.3631.2175.236.9
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-03-312018-12-31
Value174120431585418
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0

Repayments Of Long Term Debt

us-gaap:ProductOrService

us-gaap:RepaymentsOfLongTermDebt

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1502492139962811473477942184093583501130-65777376738141321211722
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations brka:InsuranceAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value174887276259143155512301207122116051761322446244981259522675202212636
Percentage of RepaymentsOfLongTermDebt116.41779.63.6269.850.911.7157.92873.866.41725.830.22644.039.5-37.112.7164.1137.01646.3631.2175.236.9
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations brka:RailroadUtilitiesAndEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Debt Instrument Interest Rate Stated Percentage

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-30
Value0.2120.1870.2020.2140.1920.20.2970.2530.2890.2720.3030.3110.1240.3230.297
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

Operating Lease Right Of Use Asset

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value430966463275291451022652430811421016517658374322124335126982264822864367602
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Proceeds From Repayments Of Short Term Debt

us-gaap:ProceedsFromRepaymentsOfShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1133101260408-503811-1674849-19291957-34037587-75827071547130-262-382136710-95321-4-48-296-477-496680-77-8-904853-28-73421042921-62
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

brka:ConversionOfSharesFromOneClassToAnotherClassOfStock

us-gaap:CommonClassA



Period End2020-03-31
Value-4290.0
Percentage of ConversionOfSharesFromOneClassToAnotherClassOfStock100.0

us-gaap:CommonClassB



Period End2020-03-31
Value6
Percentage of ConversionOfSharesFromOneClassToAnotherClassOfStock-150000.0

us-gaap:ProductOrService

brka:CostOfLeasing

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10029731010100010201112978988983
Percentage of CostOfLeasing100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:CostsOfServicesAndOperatingExpenses

brka:UtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value272227932981268028423004298128562800
Percentage of CostsOfServicesAndOperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity

brka:DebtMaturingDuringPeriod

srt:Subsidiaries, brka:InsuranceAndOther, srt:ScenarioForecast, brka:NotesDueTwoThousandThirtyAtOnePointEightFivePercent, us-gaap:SeniorNotes, brka:BerkshireHathawayFinanceCorporation



Period End2021-03-31
Value750
Percentage of DebtMaturingDuringPeriod100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossAttributableToCommonStockholders

brka:TheKraftHeinzCompany



Period End2020-03-312019-09-302019-03-312018-12-292018-09-302018-09-292018-06-302018-03-312017-12-302017-09-302017-06-302017-03-312016-12-312016-09-302016-07-032016-04-032015-09-272015-06-282014-12-282014-09-282014-06-29
Value378899405-1260861963075699380039441159893944842770896-303-344-17-8-53
Percentage of EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossAttributableToCommonStockholders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

brka:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInRegulatoryAssetsAndLiabilities

us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-4014-17-12-11143-5-94-3-311-1-5-6
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInRegulatoryAssetsAndLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:IncreaseDecreaseInDeferredChargesReinsuranceAssumed



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-260388-275-197-273-347-278-278-2711275625233-5783-542147146-111-285123107139-251-294662-278-13710680-389-832873103196120-69550-3-87120117
Percentage of IncreaseDecreaseInDeferredChargesReinsuranceAssumed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests



Period End2020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value-13717-274-16-16-119
Percentage of IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital



Period End2020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value-39-20-98-35-37
Percentage of IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests28.5-117.635.818.8-31.231.1

us-gaap:NoncontrollingInterest



Period End2020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value-9837-176-13-21-82
Percentage of IncreaseDecreaseThroughTransactionsWithNoncontrollingInterests71.5217.664.281.2131.268.9

us-gaap:ProductOrService

brka:InsuranceUnderwritingExpenses

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value292431672708256927562714235221232604239722072378233917652001187020772012187520181612
Percentage of InsuranceUnderwritingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

brka:InvestmentIncomeInterestDividendAndOther

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value164816851789165414871460144613991213124712481284113210941043123611491088104613381090
Percentage of InvestmentIncomeInterestDividendAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value22762345248322952117321016191534131513401320132211624411276161713911599113213231303
Percentage of InvestmentIncomeInterestDividendAndOther138.1139.2138.8138.8142.4219.9112.0109.6108.4107.5105.8103.0102.740.3122.3130.8121.1147.0108.298.9119.5

brka:PaymentsToAcquireEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value40033552122561307152746581770760801476553901308
Percentage of PaymentsToAcquireEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:PaymentsToAcquireUSTreasuryBillsAndAvailableForSaleSecuritiesDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value315516393454353583630918563423527537190130375189538050
Percentage of PaymentsToAcquireUSTreasuryBillsAndAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

brka:PercentageOfDeclineInEquityIndexValues

srt:Maximum, us-gaap:EquityContract, us-gaap:Nondesignated



Period End2020-03-31
Value0.25
Percentage of PercentageOfDeclineInEquityIndexValues100.0

srt:Minimum, us-gaap:EquityContract, us-gaap:Nondesignated



Period End2020-03-31
Value0.2
Percentage of PercentageOfDeclineInEquityIndexValues80.0

us-gaap:ProductOrService

brka:PercentageOfIncreaseOrDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0030.0049999999999999990.005-0.0010.002-0.0029999999999999990.0090000000000000010.0049999999999999990.013
Percentage of PercentageOfIncreaseOrDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:PolicyholderBenefitsAndClaimsIncurredLifeAnnuityAndHealth

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value13831741117611659041546144814181287191512131263122713841339124111671330116517381180
Percentage of PolicyholderBenefitsAndClaimsIncurredLifeAnnuityAndHealth100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ProceedsFromRedemptionsAndMaturitiesOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value369443025319354169321114293031225636398350882106131502
Percentage of ProceedsFromRedemptionsAndMaturitiesOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ProceedsFromSaleOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value532823276869439923341279075295797135771418414979
Percentage of ProceedsFromSaleOfUSTreasuryBillsAndAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:ProceedsFromSalesAndRedemptionsOfEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value21667209266723972063461951534771424089402757
Percentage of ProceedsFromSalesAndRedemptionsOfEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:ServiceRevenuesAndOtherIncome

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value87311101382140484796512871330833
Percentage of ServiceRevenuesAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:SharesIssuedAndRepurchased



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-1575-695-435-1677-413-906824103139-1261321239
Percentage of SharesIssuedAndRepurchased100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-1575-695-443-1690-418-928
Percentage of SharesIssuedAndRepurchased100.0100.0101.8100.8101.2102.4

brka:TaxableGainsOnSalesOfEquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value121112416098325186121329629727
Percentage of TaxableGainsOnSalesOfEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value325331328325333341345355352361368373367405369377339269300282255301289285280293248258248254191191183
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-21536-106593018918578-4287-11290-23075680226162-1113916369500-2161
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-5122429324157941412221949-264801842110680-8114093975987844983213786621943243061725722144566129627013382676757291412763856385512610384500171891372111084921-30472679269682366863-44895146
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-41041129693-22162347511920313010324132617458471313909268969813113164101108172821411462138-99-95017045-199
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-5122829428159061421822042-265021858310714-736410587801797499351381063514385313573152261469713352701347468355825142256516651651901048551097361145411249
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

brka:EquitySecuritiesFvNi, brka:InvestmentConcentrationRisk



Period End2020-03-312019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.690.680.680.690.70.65
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value253922727726950270472576727399267892648025415261542581525419243602413724472243492279621884222972258920259
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CostsAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value543396011856053560115352157716553255379152382546545514751698597384928248543470884594744439449174552240997424184444940846388553981739163391633780236572379663511433931332163350330376330093148629684317402877126939
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value464475185647347475464531554199446214331242683443824577242527508784036939645387323768135786359773663232274
Percentage of CostsAndExpenses85.586.384.584.984.793.980.780.581.581.283.082.385.281.981.782.382.080.580.180.578.7

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value789282628706846582068838878586658111852076847637744774537444693570047361769076527600
Percentage of CostsAndExpenses14.513.715.515.115.315.315.916.115.515.613.914.812.515.115.314.715.216.617.116.818.5

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value16165975294448359215615
Percentage of DebtSecuritiesAvailableForSaleRealizedGain100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value67261075104138628
Percentage of DebtSecuritiesAvailableForSaleRealizedLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value196820251905183817981167205020322035199219281923187618911877185717861710168816581617138213541345133713321296126512531265114211411135117010941100915
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value570609568550542232652653649581547547542553558544493440416420404
Percentage of Depreciation29.030.129.829.930.119.931.832.131.929.228.428.428.929.229.729.327.625.724.625.325.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value139814161337128812561420123412191225124812151214117511801161115711411107112110891066
Percentage of Depreciation71.069.970.270.169.9121.760.260.060.262.763.063.162.662.461.962.363.964.766.465.765.9

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-184120-1211115-31-68-133922639
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentDividendsOrDistributions

brka:TheKraftHeinzCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value130130131130130204203204203203203
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationRevenue

brka:TheKraftHeinzCompany



Period End2020-03-312019-09-302019-03-312018-12-292018-09-302018-09-292018-06-302018-03-312017-12-302017-09-302017-06-302017-03-312016-12-312016-09-302016-07-032016-04-032015-09-272015-06-282015-06-282015-03-292014-12-282014-09-282014-06-29
Value61576076595968916383637866866304687763146637632468576267679365706120261626162478279925942728
Percentage of EquityMethodInvestmentSummarizedFinancialInformationRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-688923115610624983219554-34871145385942-8047
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-41011211355161-16244357-240
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-684823003510489982719393-34855142945585-7807
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings

us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-1324444394314820-564190432-17666349-26499110151629-766
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements

us-gaap:FairValueInputsLevel3



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value-43-154-84-44-62-53-26-28-27-23-46-21-14
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs



Period End2020-03-312019-03-31
Value3733
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

srt:ParentCompany, brka:InsuranceAndOther, us-gaap:SeniorNotes



Period End2020-03-312019-12-312019-03-312018-12-31
Value228-25517093
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:EquityContract, us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1393267234213770-603137372-206
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-688823104410692983519552-34905145695990-7809148657290315191031506431850648826636297454-37623661131135417141714492505526917125-106300921289-407-744583831318
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillAcquiredDuringPeriod



Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value151595254016617246412361477
Percentage of GoodwillAcquiredDuringPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillTranslationAndPurchaseAccountingAdjustments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-23843-104-836-4284-2122730124148-75-540-29-92-211-159-229118-299-143-1911417-13456
Percentage of GoodwillTranslationAndPurchaseAccountingAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value300240644124168-32113163274012138252309239252225206240
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value300240644124168-3211316327401
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

brka:BerkadiaCommercialMortgageLLCPilotTravelCentersLLCAndElectricTransmissionTexasLLC



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value199192177147167154148125136-5653
Percentage of IncomeLossFromEquityMethodInvestments66.380.027.5118.599.4-4.846.838.233.9-2.621.0

brka:TheKraftHeinzCompany



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value10126239-33651682022652138252
Percentage of IncomeLossFromEquityMethodInvestments33.710.837.1104.853.261.866.1100.0100.0

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5951020319673546437716192069289151269210562624821182824231196014478802488131050186828313731304248324117991518117919915335505712315177112009310
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-14049645557027855371-77482779813-801-27550700442145144317791325497-23631911151161222059745851141948658115179398677-401104846942541718215911058-884583
Percentage of IncreaseDecreaseInIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value583283512201254778117713488556924124540117516900175784631514541067525784-1146736132
Percentage of IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1140-408317111299044421486881378327621339-15557378-501-657745228174-1804841123-32
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value171079470441-18001197850347-392834249864-7531767298-329683105941665225-226651660-6
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2083-13155248572237-1338136812272186-90012824111197-1437297291987-13713546032064-11712464002415-1394179-12951475-149194-4782043-688-134-7562737-1316604-3223013
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInUnearnedPremiums



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2006-956658-492054-1180721-992352-49242311829-938462-321476-919932-2881667-8233701151497-913278-1521306-1002414-3562078-74719-891669-1058118-2241274
Percentage of IncreaseDecreaseInUnearnedPremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:InterestPaid

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value4091323391453954342131263381243578430656246
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value742730779687683738727655747717701673737658724
Percentage of InterestPaid181.4553.0229.8473.8172.9170.0341.3519.8221.0578.2196.4801.2240.81175.0294.3

us-gaap:ProductOrService

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3175633854204601312359175142424130915886488339782678
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value6841367537244359588439362935382247592555269930374216
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value372-15518178-812146364-253-51-276-250-77
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:ReinsurancePolicyType

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

brka:DeferredChargesReinsuranceAssumed, brka:RetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value259-388275197273347279277271-170625233-5783
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType

brka:UnpaidLossesAndLossAdjustmentExpenses, brka:RetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value241343-21732298-1-5-302160755-116050
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims19.3-346.1-0.787.80.785.9-0.4-1.8-11.1-126.63020.0-0.4-277.5

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value109791275510858106691017411610993294018963944112137874718566
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims14239.0-3287.43948.45415.73726.73345.83559.93393.93307.4-553.448548.03754.1-321.0

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1069611800105851029998991096596549129872289871135785158299
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims14129.7-3041.23849.15227.93626.03159.93460.23295.73218.5-526.845428.03654.5-143.5

us-gaap:ReinsurancePolicyType

brka:RetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value283955273370275645278272241454
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1109.3-246.199.3187.8100.7185.999.698.288.9-26.6

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4971133100711167666710513693796913581686999946963104636873100100711251101341231211431321239496130122179
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification



Period End2020-03-312018-12-312018-09-302018-06-302018-03-31
Value-388100-71
Percentage of NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification100.0100.00.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312018-12-312018-09-302018-06-302018-03-31
Value-38810061304
Percentage of NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification100.0100.00.00.0-86343.7

us-gaap:NonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-7027531311109261004820322-35508147066362-8015163965225775
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-7027531311109261004820322-35508147066362-8015163965225775
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:OperatingExpenses

us-gaap:CargoAndFreight



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value359337303839388539824207401239743852
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:OperatingIncomeLoss

brka:CorporateReconcilingItemsAndEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value216-453477-108163483-127-212-219-777-278-296-259-478-477-213-213-259-354-212
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value684658078538780271035896831283016647511850776537514462597370650557375980690960596266579468966555529156345531553162135885444654425853
Percentage of OperatingIncomeLoss3169.4-1281.91789.9-7224.14357.71220.7-6544.9-3915.6-3035.2-658.7-1826.3-2208.4-1986.1-1309.4-1545.1-3054.0-2693.4-2308.9-1951.7-2858.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:IncomeStatementLocation, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:InvestmentIncome, brka:BerkshireHathawayInsuranceGroup



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value164716841782164914851451145513921205124412461283112910761029123511421084104513341087
Percentage of OperatingIncomeLoss762.5-371.7373.6-1526.9911.0300.4-1145.7-656.6-550.2-160.1-448.2-433.4-435.9-225.1-215.7-579.8-536.2-418.5-295.2-629.20.0

us-gaap:ConsolidationItems, us-gaap:IncomeStatementLocation, us-gaap:StatementBusinessSegments, us-gaap:Subsegments

us-gaap:OperatingSegments, brka:PremiumsEarnedNet, brka:BerkshireHathawayInsuranceGroup, brka:BerkshireHathawayPrimaryGroup



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-3393153167-302021352349924652232189
Percentage of OperatingIncomeLoss-15.3-20.532.1-154.6-18.441.8-106.3-110.4-45.2-31.7-18.7-78.4-73.0

us-gaap:OperatingSegments, brka:PremiumsEarnedNet, brka:BerkshireHathawayInsuranceGroup, brka:BerkshireHathawayReinsuranceGroup



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-489-116752-104-253-985-163297-258-685-1845-375-743
Percentage of OperatingIncomeLoss-226.4257.610.996.3-155.2-203.9128.3-140.1117.888.2663.7126.7286.9

us-gaap:OperatingSegments, brka:PremiumsEarnedNet, brka:BerkshireHathawayInsuranceGroup, brka:Geico



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value984-33376393770472627673677-188-416119175
Percentage of OperatingIncomeLoss455.67.378.8-363.9472.497.7-493.7-317.5-309.124.2149.6-40.2-67.6

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, brka:BerkshireHathawayEnergyCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value41942410615935402341165586487371262670615492124666656945311536495964631051578619232586435553
Percentage of OperatingIncomeLoss194.0-93.6222.4-549.1331.348.4-917.3-276.4-222.4-4.8-454.0-226.4-237.5-102.9-261.2-312.7-267.1-174.9-325.7-306.10.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BerkshireHathawayInsuranceGroup



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value21095772363210519721140205425961723617-963125975019401438174514901579168812861834130319262135166117151341134123612385100815842350
Percentage of OperatingIncomeLoss976.4-127.4495.4-1949.11209.8236.0-1617.3-1224.5-786.8-79.4346.4-425.3-289.6-405.9-301.5-819.2-699.5-609.7-476.8-606.60.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:BurlingtonNorthernSantaFeCorporation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value158418711941177316651816187916551513173617101537134515641633123812581728183915361672187416541472116916861556155613971289147415081280
Percentage of OperatingIncomeLoss733.3-413.0406.9-1641.71021.5376.0-1479.5-780.7-690.9-223.4-615.1-519.3-519.3-327.2-342.3-581.2-590.6-667.2-519.5-724.50.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value211123172484252721943364201221351855143320021939148710611981168714821036125913931205103713371369106890412021151948
Percentage of OperatingIncomeLoss977.3-511.5520.8-2339.81346.0696.5-1584.3-1007.1-847.0-184.4-720.1-655.1-574.1-222.0-415.3-792.0-695.8-400.0-355.6-657.10.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:McLaneCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value65685059111754467609745698860106129136118106147131741201261151141261261141329813073
Percentage of OperatingIncomeLoss30.1-15.010.5-54.668.115.5-34.6-31.6-27.4-12.5-16.2-23.3-34.0-12.6-22.2-60.6-63.8-45.6-29.9-69.30.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value558550639745621856628697515644491555393590449457324460378498384451355453287
Percentage of OperatingIncomeLoss258.3-121.4134.0-689.8381.0177.2-494.5-328.8-235.2-82.9-176.6-187.5-151.7-123.4-94.1-214.6-152.1-177.6-106.8-234.90.00.00.00.00.0

us-gaap:OperatingLeaseLeaseIncome



Period End2020-03-312019-09-302019-06-302019-03-31
Value1428143814911436
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value142814911438149114361354147414701434
Percentage of OperatingLeaseLeaseIncome100.00.0100.0100.0100.00.00.00.00.0

us-gaap:OperatingLeaseLeaseIncomeLeasePayments



Period End2020-03-312019-09-302019-06-302019-03-31
Value1096109711181074
Percentage of OperatingLeaseLeaseIncomeLeasePayments100.0100.0100.0100.0

us-gaap:OperatingLeaseVariableLeaseIncome



Period End2020-03-312019-09-302019-06-302019-03-31
Value332341373362
Percentage of OperatingLeaseVariableLeaseIncome100.0100.0100.0100.0

us-gaap:OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value292301301293286285274268275
Percentage of OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-1454857-700-17183-689-79-1364601237771798558-1383-44-607493-432-716577-1360-1186-122635426222549549-203-650148446-537219
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-4731-603-16-9-436-21242369-43-9-44301311-423-152-10177-735656-42-51016-6-1
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-1531198-75145310-1111-124-136333584023598361957967455-982-697-25221768-7266590-3898-1517-1247377105291621363136357854684483307-17777883
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-1478-73049288-1088-119-133132783883531358257727500-979-677-25281779-7214553-3868-1454-123537210249137133258554924503269-173678631873-5325-7381185
Percentage of OtherComprehensiveIncomeLossNetOfTax96.597.2108.992.997.996.097.797.699.898.199.099.6100.699.797.1100.2100.699.393.799.295.899.098.797.399.797.7101.2100.4100.498.997.799.70.00.00.00.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-53-21-422-23-5-32814673724-45-3-206-11-5237-30-63-12528-7-24-238-41203-130155
Percentage of OtherComprehensiveIncomeLossNetOfTax3.52.8-8.97.12.14.02.32.40.21.91.00.4-0.60.32.9-0.2-0.60.76.30.84.21.01.32.7-1.2-0.4-0.41.12.30.30.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent



Period End2020-03-312019-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-14782883269-173678631873-5325-738118538593874-64571513
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

brka:OtherAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-03-31
Value-48-12
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent3.2-4.2

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2020-03-312019-03-31
Value7150
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-4.817.4

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value-13993
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent9.432.3

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value-1362157
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent92.254.5

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-9575845-26-6662113-8724-28234410-32021-51-4-172-24744-491733-3916-7-25071717-25-87422-37-12
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-211717-6-173-2017-766187-18113-19-53-8513626-75-92444-7-23-7-3-10-6
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value412120-1-10710465822699107671108046321935553632115-146843364459126126951769125237
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeOtherNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-59-1310-32-1345-21-5-31-473233-14316-2210-425-125352-25-4724646416-30171-20
Percentage of OtherComprehensiveIncomeOtherNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-180-281897117-535-92-4512410495247118377152391581-271-26913665-8623234-37961202-601263925911246115981598141196418125034-1788
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:OtherExpenses

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value84910121162117565391910941133749
Percentage of OtherExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value566-4861003268469-36342564201652-707-283-120188-99327-255-131-460-22666-2812013236610-533-202-248-154-213-166-262-437-225-28-121-52-100-5-98
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

brka:UnpaidLossesAndLossAdjustmentExpenses, brka:RetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value196266183257203399179224563216153195435
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value100161001391448960900798538077806378508441758270156894
Percentage of PaymentsForLossesAndLossAdjustmentExpense5110.23764.34996.73486.44436.92469.44512.33599.61394.33907.94955.63597.41584.8

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-81429109044-67328-31-379153349286-3115-1922147390-14420-34-754-128-48-214-316-644945122568-221-317653-486443-122-327662-69210
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2695115231826227581482611126891912215995843752553018510030250539953755393-2470056016766292
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireLoansReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value59518-134177142316674041434212985283361317535871839192183584412026957104752402314210447410371086162235982
Percentage of PaymentsToAcquireLoansReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromCollectionOfLoansReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value70868482937678881001031206296972199794801479911712911511215750189235261696166732741512321891205128912431889192174
Percentage of ProceedsFromCollectionOfLoansReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-159-156-6210-289-66-24-151-102-13-16-69-2314016-702620-68-46-67-1641-17144112-180-7
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanLossesExpensed



Period End2020-03-312019-03-31
Value8632
Percentage of ProvisionForLoanLossesExpensed100.0100.0

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

us-gaap:RepaymentsOfDebt

srt:Subsidiaries, brka:RailroadUtilitiesAndEnergy, brka:BerkshireHathawayEnergyCompanyAndSubsidiaries



Period End2020-03-31
Value1700
Percentage of RepaymentsOfDebt100.0

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

srt:ParentCompany, brka:InsuranceAndOther, brka:NotesDueTwoThousandTwentyFiveAtZeroPointZeroPercent, us-gaap:SeniorNotes



Period End2020-03-31
Value1000
Percentage of RepaymentsOfDebt58.8

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:LongtermDebtType, dei:LegalEntity

srt:Subsidiaries, brka:InsuranceAndOther, us-gaap:SeniorNotes, brka:BerkshireHathawayFinanceCorporation



Period End2020-01-31
Value350
Percentage of RepaymentsOfDebt0.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value41452653684516944460423926371445427442554150958907605255751865187583445906854460524035182058989513684864448259511994976245453470494654146541446934386744720410503854638147379553373938274337203616536274317093203730198299042960722784
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:AutoSales



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value190921692250212519372094208320731931
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.63.35.04.84.63.34.64.74.7

brka:ElectricityAndNaturalGas



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value351534904213342936873594426735663524
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.55.39.37.78.75.69.48.18.5

brka:GroceryAndConvenienceStoreDistribution



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value785986828298804280358390870982618158
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.013.318.418.119.013.219.218.719.7

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value319263442634026341283240935208332493325631882363263205531733302293369630536305422827926832274362779224941
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax77.052.775.376.876.555.373.275.176.861.753.055.246.457.851.756.154.051.846.554.151.3

brka:ManufacturedBuildingProducts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value369538244101414335524495347734312920
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.95.89.19.38.47.17.77.87.0

brka:ManufacturedConsumerProducts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value332836333528366932902932400841543696
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.05.67.88.37.84.68.89.48.9

brka:ManufacturedIndustrialAndCommercialProducts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value616360516390654965055947651368436608
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.99.314.114.715.39.314.315.515.9

brka:OtherRetailAndWholesaleDistribution



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value353839513470362634653826366134613210
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.56.07.78.28.26.08.17.87.7

brka:UtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value363436244338356638253737441937203679
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.85.59.68.09.05.99.78.48.9

us-gaap:FoodAndBeverage



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value380641194202432141254106407941273997
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.26.39.39.79.76.49.09.39.6

us-gaap:Service



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value763985728717855677968870863083397465
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.413.119.319.218.413.919.018.818.0

us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

brka:AutoSales, brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value190921692250212519372094208320731931
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.63.35.04.84.63.34.64.74.7

brka:ElectricityAndNaturalGas, brka:BerkshireHathawayEnergyCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value351534904213342936873594426735663524
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.55.39.37.78.75.69.48.18.5

brka:GroceryAndConvenienceStoreDistribution, brka:McLaneCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value785986828298804280358390870982618158
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.013.318.418.119.013.219.218.719.7

brka:ManufacturedBuildingProducts, brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value369538244101414335524506347334312920
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.95.89.19.38.47.17.67.87.0

brka:ManufacturedConsumerProducts, brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value332836333528366932906056283841543696
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.05.67.88.37.89.56.29.48.9

brka:ManufacturedIndustrialAndCommercialProducts, brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value611960036346650364596401638467896554
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.89.214.014.615.210.014.115.315.8

brka:ManufacturedIndustrialAndCommercialProducts, brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value444844464649475454
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.1

brka:OtherRetailAndWholesaleDistribution, brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value605697524534544558521519498
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.51.11.21.21.30.91.11.21.2

brka:OtherRetailAndWholesaleDistribution, brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value293332542946309229213333311729422712
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.15.06.57.06.95.26.96.66.5

us-gaap:FoodAndBeverage, brka:McLaneCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value380641194202432141254106407941273997
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.26.39.39.79.76.49.09.39.6

us-gaap:Service, brka:BerkshireHathawayEnergyCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7939571191122372592311401186700
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.91.52.62.81.71.42.52.71.7

us-gaap:Service, brka:BurlingtonNorthernSantaFeCorporation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value536657855967583757136142609958315580
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.98.813.213.113.59.613.413.213.4

us-gaap:Service, brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value387420445429348760262279218
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.61.01.00.81.20.60.60.5

us-gaap:Service, brka:McLaneCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value13241680232031162017
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.60.20.10.00.00.00.00.0

us-gaap:Service, brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9619941034104499011889651023950
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.31.52.32.32.31.92.12.32.3

us-gaap:StatementBusinessSegments

brka:BerkshireHathawayEnergyCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value430844475404465244124517540747524224
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.46.812.010.510.47.111.910.710.2

brka:BurlingtonNorthernSantaFeCorporation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value536657855967583757136142609958315580
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.98.813.213.113.59.613.413.213.4

brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value141341457714944152781419318281134781517213886
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.122.333.134.433.528.729.734.333.5

brka:McLaneCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value117971321712580123861218012527128041240812172
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.520.227.927.928.719.728.228.029.3

brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value584764656274630758946664621260925647
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.19.913.914.213.910.513.713.813.6

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value61265653686497263598606786371463450622004150958907605255751865187583445906854460524035182058989513684864448259511994976245453470494654146541446934386744720410503854638147379553373938274337203616536274317093203730198299042960722784
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueNotFromContractWithCustomer



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value198132087719803182861946018023
Percentage of RevenueNotFromContractWithCustomer100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

brka:BerkshireHathawayEnergyCompany



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value199287316260185299
Percentage of RevenueNotFromContractWithCustomer1.01.41.61.41.01.7

brka:BurlingtonNorthernSantaFeCorporation



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value141415121413
Percentage of RevenueNotFromContractWithCustomer0.10.10.10.10.10.1

brka:InsuranceCorporateAndOther



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value176051849617431160201724615934
Percentage of RevenueNotFromContractWithCustomer88.988.688.087.688.688.4

brka:ManufacturingBusinesses



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value880917937865994795
Percentage of RevenueNotFromContractWithCustomer4.44.44.74.75.14.4

brka:McLaneCompany



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value242724192218
Percentage of RevenueNotFromContractWithCustomer0.10.10.10.10.10.1

brka:ServiceAndRetailingBusinesses



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value1091113610801110999964
Percentage of RevenueNotFromContractWithCustomer5.55.45.56.15.15.3

us-gaap:ProductOrService

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value10896121561105210340978710805101669430947590701165288158165
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:ReinsurancePolicyType

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense

brka:DeferredChargesReinsuranceAssumed, brka:RetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value259-17275279273433279277271-146117119409
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByLiabilityClass, us-gaap:ReinsurancePolicyType

brka:UnpaidLossesAndLossAdjustmentExpenses, brka:RetroactiveReinsurance



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value243802-305-1-5-30368-10-1-398
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense9.3-2235.30.7-70.4-0.4-1.8-11.1-252.1-8.5-0.8-97.3

us-gaap:ProductOrService

brka:PrimaryInsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-172-136-123-98-10048-217-197-571320-37-271-261187-304
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-66.4800.0-44.7-35.1-36.611.1-77.8-71.1-210.7-219.2-31.6-227.7-63.80.00.0

brka:PropertyAndCasualtyInsuranceAndReinsuranceExcludingRetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-200-356-467-41112160-512-301-753-83-295-300134
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-77.22094.1-169.8-14.741.037.0-183.5-108.7-277.956.8-252.1-252.132.8

us-gaap:ReinsurancePolicyType

brka:PropertyAndCasualtyReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-28-220-34457212112-295-104-182-403-258-29395
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense-10.81294.1-125.120.477.725.9-105.7-37.5-67.2276.0-220.5-24.496.6

brka:RetroactiveReinsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value28336327327727512827827224122210711811
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense109.3-2135.399.399.3100.729.699.698.288.9-152.191.599.22.7

us-gaap:StatementClassOfStock

us-gaap:TreasuryStockSharesAcquired

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312014-12-312014-09-302012-12-312011-12-31
Value1342.02688.0213.0281.01258.0992.00.00.09475.083.0
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0100.0100.00.00.0100.0100.0

us-gaap:CommonClassB



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312014-12-312014-09-302012-12-312011-12-31
Value5631600000
Percentage of TreasuryStockSharesAcquired401539.7227253.61487729.1628519.6518269.559471.30.00.06401.0691947.0

us-gaap:ProductOrService

brka:AccountsAndOtherReceivablesNet

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3237341737563641346036663531
Percentage of AccountsAndOtherReceivablesNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:AircraftRepurchaseLiabilitiesAndDeferredRevenueLeasesNet

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value529152815106514650714593
Percentage of AircraftRepurchaseLiabilitiesAndDeferredRevenueLeasesNet100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

brka:EquityDerivativeIntrinsicValue

us-gaap:EquityContract, us-gaap:Nondesignated



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value20003976267919571653789
Percentage of EquityDerivativeIntrinsicValue100.0100.0100.0100.0100.0100.0100.0

brka:EquitySecuritiesAccumulatedUnrealizedGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value67533137687107844978968887269890105494922718714695864
Percentage of EquitySecuritiesAccumulatedUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesByIndustry

brka:BanksInsuranceAndFinance



Period End2020-03-312019-12-312019-09-302018-12-31
Value22046619765180438260
Percentage of EquitySecuritiesAccumulatedUnrealizedGainLoss32.645.048.054.7

brka:CommercialIndustrialAndOther



Period End2020-03-312019-12-312019-09-302018-12-31
Value-22614964129538792
Percentage of EquitySecuritiesAccumulatedUnrealizedGainLoss-0.310.912.012.6

brka:ConsumerProducts



Period End2020-03-312019-12-312019-09-302018-12-31
Value45713607474308722838
Percentage of EquitySecuritiesAccumulatedUnrealizedGainLoss67.744.140.032.7

brka:IncomeTaxesPrincipallyDeferred



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value525716679960389596225685251375593405651455718566078655984314821327794473570721807096363126622666267861609612356110660601600015773950849495474959944494445144272143238378043715637809371983635219225
Percentage of IncomeTaxesPrincipallyDeferred100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:InventoryWorkInProcessAndOtherInventoryNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value27512700269527272678262522322213222823152805278726762506246124642519778856855839850926900872849854861855883941902916897509
Percentage of InventoryWorkInProcessAndOtherInventoryNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:LiabilityForUnpaidClaimsAndClaimAdjustmentExpenseRetroactiveReinsuranceContracts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value42269424414136441549416334183441935421154234442937409934039140587249722405824702
Percentage of LiabilityForUnpaidClaimsAndClaimAdjustmentExpenseRetroactiveReinsuranceContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value4226942441413644154941633418344193542115423444293724972
Percentage of LiabilityForUnpaidClaimsAndClaimAdjustmentExpenseRetroactiveReinsuranceContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:OtherInventoryPurchasedGoodsNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value78127839808980167738772170856692673466966798652163876399610660516006591757985846546641724009396341154057389840013859390635943681321833663346
Percentage of OtherInventoryPurchasedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:USTreasuryBills

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value94623638225337877745880298150659947452434804078515613526600861052473384569
Percentage of USTreasuryBills100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:UnamortizedDeferredChargesOnReinsuranceAssumed



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value134881374713359136341383114104144511473015007152781357213597138308047768777724359401941393810
Percentage of UnamortizedDeferredChargesOnReinsuranceAssumed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CounterpartyName, us-gaap:ReinsurancePolicyType, dei:LegalEntity

brka:AmericanInternationalGroupInc, brka:RetroactiveReinsurance, brka:NationalIndemnityCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value61006300640066006900
Percentage of UnamortizedDeferredChargesOnReinsuranceAssumed45.245.847.948.448.9

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1348813747133591363413831141041445114730150071527813572135971383080477505765277997687
Percentage of UnamortizedDeferredChargesOnReinsuranceAssumed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:StatementClassOfStock

dei:EntityCommonStockSharesOutstanding

us-gaap:CommonClassA



Period End2020-04-232020-02-132019-10-242019-07-252019-04-252019-02-142018-10-252018-07-262018-04-272018-02-132017-10-262017-07-272017-04-272017-02-162016-10-272016-07-282016-04-282016-02-172015-10-302015-07-302015-04-232015-02-182014-10-302014-07-252014-04-242014-02-182013-10-242013-07-252013-04-252013-02-182012-10-252012-07-262012-04-272011-10-282011-07-282011-04-292011-02-172011-02-15
Value692885.0700396.0707755.0709836.0723114.0725807.0733152.0734527.0747677.0748745.0753528.0755437.0768910.0774680.0784669.0788894.0806658.0807811.0811129.0811755.0824730.0825522.0832214.0835607.0856453.0857911.0863949.0868448.0891193.0892722.0919298.0927848.0930998.0939280.0939981.0941481.0943242.0936053.0
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonClassB



Period End2020-04-232020-02-132019-10-242019-07-252019-04-252019-02-142018-10-252018-07-262018-04-272018-02-132017-10-262017-07-272017-04-272017-02-162016-10-272016-07-282016-04-282016-02-172015-10-302015-07-302015-04-232015-02-182014-10-302014-07-252014-04-242014-02-182013-10-242013-07-252013-04-252013-02-182012-10-252012-07-262012-04-272011-10-282011-07-282011-04-292011-02-172011-02-15
Value13901385138313861368137213621365134613441336133313131304128912821255125312481247122712261215121011811179116911621128112510991086108010671066106110571072
Percentage of EntityCommonStockSharesOutstanding200712.6197887.3195465.2195300.2189215.5189134.6185881.4185948.3180034.6179544.7177417.7176556.4170826.4168404.1164280.1162562.1155654.4155169.9153903.9153662.9148830.8148531.3146108.2144821.0137994.7137443.3135409.6133914.5126619.9126097.0119634.0117086.1116044.2113621.0113508.1112695.8112156.7114551.5

us-gaap:ProductOrService

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value255652761125880254682516425776271782638425782230992176321024206272216422426204682002817879
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value140491470815309151201464311410112691098610786113341164011273110311143411590115971120511994
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent55.053.359.259.458.244.341.541.641.849.153.553.653.551.651.756.755.967.1

us-gaap:ProductOrService

us-gaap:AccountsReceivableGross

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value125121227512852131801295712617131971294512568146811544315089149441363014181140361409111521
Percentage of AccountsReceivableGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value2970312035513448323734333346
Percentage of AccountsReceivableGross23.725.427.626.225.027.222.8

us-gaap:AdditionalPaidInCapitalCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value356193565835612356103562235707357133569435681356943568435663356993568135730357103567035620356103558435565355733556035491354653547236082361013727037230378903785637846378073778637771375783753327074
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value589418387374365388380366358362362336317333345342327368
Percentage of AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value10091137127131129128
Percentage of AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables17.021.835.434.035.933.235.4

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value549626665711628546560598731977102610661101112113991372126811071381150817911754
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value31745947751647040843645351958862866868771480075369963277891210611072
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax57.773.371.772.674.874.777.975.871.060.261.262.762.463.757.254.955.157.156.360.559.261.1

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value756370766050455683274233223224207362359309226306295405373
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax13.710.110.510.79.69.28.09.411.428.022.720.920.318.525.926.224.420.422.219.622.621.3

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-312018-12-31
Value726766
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax13.110.712.1

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value8537474629228101145614161725191024192014
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax15.55.97.16.54.64.01.41.71.50.40.50.61.31.41.21.81.50.91.71.31.10.8

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1171416233575849387694352599035667412910597194141
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value67333523788546797102129211275
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax57.321.418.813.014.330.78.38.69.27.29.311.511.910.020.015.228.422.520.012.43.63.5

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value47991416283742322424273566215046857777181126
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax40.264.356.260.945.737.344.045.236.834.855.851.959.373.360.075.862.265.973.379.493.389.4

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-312018-12-31
Value312
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax2.67.12.7

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value17491180731852319274188221942717795180191927620445212732239721891224342328322474233632504925884260282601026023
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value5536589662306231625970556029596863086279652568976787689969966951715073237359713872987704
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis31.732.633.632.333.336.333.933.132.730.730.730.831.030.830.030.930.629.228.427.428.129.6

us-gaap:ForeignGovernmentDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value8126858479627903804774807362755178378572855687268480886094549613101951132711415118301187412023
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis46.547.543.041.042.838.541.441.940.741.940.239.038.739.540.642.843.645.244.145.545.746.2

us-gaap:OtherDebtSecurities



Period End2020-03-312019-12-312018-12-31
Value515539669
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis2.93.03.4

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value3314305437604542390142233626346336333975432748004636451945493511331534253796370833892921
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis18.916.920.323.620.721.720.419.218.819.420.321.421.220.119.515.614.213.714.714.213.011.2

us-gaap:AvailableForSaleSecuritiesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value17923186851917219962194151989818271185241992021353222562341122933234652464723780245572602727160274392760727636
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:CashEquivalentsAtCarryingValue

us-gaap:USTreasuryBillSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value196003710040600162002100390014700416005700
Percentage of CashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService

us-gaap:DebtAndCapitalLeaseObligations

srt:ParentCompany, currency:EUR, brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value751376417422774676387806789779508164
Percentage of DebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany, currency:JPY, brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-30
Value397839383962
Percentage of DebtAndCapitalLeaseObligations52.951.553.4

srt:ParentCompany, currency:USD, brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8328832483219070906690659058980910603
Percentage of DebtAndCapitalLeaseObligations110.8108.9112.1117.1118.7116.1114.7123.4129.9

us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService, dei:LegalEntity

srt:Subsidiaries, currency:GBP, brka:InsuranceAndOther, brka:BerkshireHathawayFinanceCorporation



Period End2020-03-312019-12-312019-09-302019-06-30
Value2131227421082179
Percentage of DebtAndCapitalLeaseObligations28.429.828.428.1

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Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value882886798679992810650
Percentage of DebtAndCapitalLeaseObligations117.5113.6116.9128.2136.4

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Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3003530772293292951728196
Percentage of DebtAndCapitalLeaseObligations399.8402.7395.2381.1361.2

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Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2316523211239902319223226
Percentage of DebtAndCapitalLeaseObligations308.3303.8323.2299.4297.5

us-gaap:ProductOrService

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value374863759037176360253384734975242712515825663273242726227781274162717527514275672807314599
Percentage of DebtAndCapitalLeaseObligations498.9492.0500.9465.1443.1448.1307.3316.50.0334.70.00.00.00.00.00.00.00.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value667476577865018638826334662515625996266462667621786114760701609255908558811585955811057739
Percentage of DebtAndCapitalLeaseObligations888.4860.9876.0824.7829.4800.9792.7788.20.0761.60.00.00.00.00.00.00.00.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value402104056940381384283521635335244222542228180
Percentage of DebtInstrumentFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value520282526265
Percentage of DebtInstrumentFairValue0.00.00.10.10.10.10.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value762077623776008728626993766422668236728470538
Percentage of DebtInstrumentFairValue189.5187.9188.2189.6198.6188.0273.6264.7250.3

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Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3748637590371763602534975
Percentage of DebtInstrumentFairValue93.292.792.193.799.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value402154058940409384533524235361244222542228180
Percentage of DebtInstrumentFairValue100.0100.0100.1100.1100.1100.1100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value6674765778650186388262515
Percentage of DebtInstrumentFairValue166.0162.1161.0166.2176.9

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value762077623776008728626993766422668236728470538
Percentage of DebtInstrumentFairValue189.5187.9188.2189.6198.6188.0273.6264.7250.3

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.010.0110.0110.0110.0110.0110.0110.011
Percentage of DebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0

srt:ParentCompany, currency:USD, brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.0320.0320.0320.0310.0310.0310.0310.03
Percentage of DebtWeightedAverageInterestRate320.0290.9290.9281.8281.8281.8281.8272.7

us-gaap:ConsolidatedEntities, us-gaap:Currency, us-gaap:ProductOrService, dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-30
Value0.0410.0410.0410.031
Percentage of DebtWeightedAverageInterestRate410.0372.7372.7281.8

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

srt:Subsidiaries, brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.0410.040.040.040.040.040.040.04
Percentage of DebtWeightedAverageInterestRate410.0363.6363.6363.6363.6363.6363.6363.6

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

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Period End2020-03-312019-12-312019-09-302019-06-30
Value0.0450.0460.0460.046
Percentage of DebtWeightedAverageInterestRate450.0418.2418.2418.2

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Period End2020-03-312019-12-312019-09-302019-06-30
Value0.0460.0460.0460.047
Percentage of DebtWeightedAverageInterestRate460.0418.2418.2427.3

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Period End2020-03-312019-09-302019-06-30
Value0.03750.0390.039
Percentage of DebtWeightedAverageInterestRate375.0354.5354.5

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Period End2020-04-30
Value0.0107
Percentage of DebtWeightedAverageInterestRate0.0

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Period End2020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302014-12-312014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value1231111215121343111
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value2323181952524130262819152043512251022111316273315191552128
Percentage of DerivativeAssets2300.00.00.00.00.02600.01366.73000.02600.02800.01900.0750.02000.0860.0500.0600.00.00.00.00.00.01300.00.0900.0825.0500.01900.01500.00.012800.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value15612212613111911811011811411311610610794999511298999496947060566953517491
Percentage of DerivativeAssets15600.00.00.00.00.05900.03666.711800.011400.011300.011600.05300.010700.01880.09900.04750.00.00.00.00.00.09400.00.02000.01400.02300.05300.05100.00.09100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value180145144150171172154149141142136123128142105109114103109116107108869093877367220
Percentage of DerivativeAssets18000.00.00.00.00.08600.05133.314900.014100.014200.013600.06150.012800.02840.010500.05450.00.00.00.00.00.010800.00.03000.02325.02900.07300.06700.022000.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value180145144150171172154149141142136123128142105109114103109116107108869093877367220
Percentage of DerivativeAssets18000.00.00.00.00.08600.05133.314900.014100.014200.013600.06150.012800.02840.010500.05450.00.00.00.00.00.010800.00.03000.02325.02900.07300.06700.022000.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value2361968123614701682245218692006237821722187249424302890
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value2361968123614701682245218692006237821722187249424302890
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value2361968123614701682245218692006237821722187249424302890
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value236196812361470168224522172
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-30
Value23619681236
Percentage of DerivativeLiabilities100.0100.0100.0

us-gaap:ProductOrService

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value236196812361470168224522172
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value76641113
Percentage of DerivativeLiabilities0.30.60.50.30.10.00.10.1

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value12059629483101637569
Percentage of DerivativeLiabilities5.16.15.06.44.94.13.43.73.2

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value59112822159161810
Percentage of DerivativeLiabilities2.51.12.31.50.90.40.90.90.5

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value186769612099111809382
Percentage of DerivativeLiabilities7.97.97.88.25.94.54.34.63.8

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value186769612099111809382
Percentage of DerivativeLiabilities7.97.97.88.25.94.54.34.63.8

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value14171143852304224524265222675928753
Percentage of DerivativeLiabilityNotionalAmount100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.2660.2660.2660.2670.2670.2670.2670.267
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationAssets

brka:TheKraftHeinzCompany



Period End2020-03-282019-12-282019-09-282018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302016-12-312016-01-032015-09-272015-06-282014-12-28
Value1040731014501028221036271197301218961207871202321200511204801229731217923606236763
Percentage of EquityMethodInvestmentSummarizedFinancialInformationAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationLiabilities

brka:TheKraftHeinzCompany



Period End2020-03-282019-12-282019-09-282018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302016-12-312016-01-032015-09-272015-06-282014-12-28
Value5294949701510165172154152560245432453985610806290656737544332076121077
Percentage of EquityMethodInvestmentSummarizedFinancialInformationLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:EquityMethodInvestments

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value17483175051753517208173081732517453175301768717635156951558415345
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3900370037003700360035003400
Percentage of EquityMethodInvestments22.321.121.121.520.820.219.3

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value1360013800138001350013700138131745317530176351534515711157521581015714158163950
Percentage of EquityMethodInvestments77.878.878.778.579.279.7100.0100.0100.0100.00.00.00.00.00.00.0

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us-gaap:EquityMethodInvestmentsFairValueDisclosure

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8100105009100101001060014007179352044425306
Percentage of EquityMethodInvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8051104569091101021062614007179352044425306
Percentage of EquityMethodInvestmentsFairValueDisclosure99.499.699.9100.0100.2100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1358713757137701352213813
Percentage of EquityMethodInvestmentsFairValueDisclosure167.7131.0151.3133.998.6

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8051104569091101021062614007179352044425306
Percentage of EquityMethodInvestmentsFairValueDisclosure99.499.699.9100.0100.2100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value180782248027220051200516191771172757207332179729170540
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302018-12-31
Value13000189001790014500
Percentage of EquitySecuritiesFvNi7.27.68.18.4

brka:AppleInc



Period End2020-03-312019-12-312019-09-302018-12-31
Value63800737005700040300
Percentage of EquitySecuritiesFvNi35.329.725.923.3

brka:BankOfAmericaCorporation



Period End2020-03-312019-12-312019-09-302018-12-31
Value20200334002780022600
Percentage of EquitySecuritiesFvNi11.213.512.613.1

brka:CocaColaCompany



Period End2020-03-312019-12-312019-09-302018-12-31
Value17700221002180018900
Percentage of EquitySecuritiesFvNi9.88.99.910.9

brka:WellsFargoAndCompany



Period End2020-03-312019-12-312019-09-302018-12-31
Value9900186002020020700
Percentage of EquitySecuritiesFvNi5.57.59.212.0

us-gaap:EquitySecuritiesByIndustry

brka:BanksInsuranceAndFinance



Period End2020-03-312019-12-312019-09-302018-12-31
Value628911023959649882592
Percentage of EquitySecuritiesFvNi34.841.343.947.8

brka:CommercialIndustrialAndOther



Period End2020-03-312019-12-312019-09-302018-12-31
Value33291459984153828544
Percentage of EquitySecuritiesFvNi18.418.518.916.5

brka:ConsumerProducts



Period End2020-03-312019-12-312019-09-302018-12-31
Value84600996348201561621
Percentage of EquitySecuritiesFvNi46.840.237.335.7

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value174889237271209195200165191420172253206985179681170494
Percentage of EquitySecuritiesFvNi96.795.795.199.899.899.799.8100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value4446515050203474846
Percentage of EquitySecuritiesFvNi0.00.00.00.00.00.10.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value58491071010805301301301300
Percentage of EquitySecuritiesFvNi3.24.34.90.20.20.20.1

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:ValuationTechnique

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, brka:CommonStockWarrants, brka:ValuationTechniqueWarrantPricingModel



Period End2020-03-312019-12-312019-09-30
Value290136
Percentage of EquitySecuritiesFvNi0.00.00.1

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:PreferredStock, us-gaap:ValuationTechniqueDiscountedCashFlow



Period End2020-03-312019-12-312019-09-30
Value55401031410363
Percentage of EquitySecuritiesFvNi3.14.24.7

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value180782248027220051200516191771172757207332179729170540
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value180782248027220051200516191771172757207332179729170540
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value180782248027220051200516191771172757201226174033164026
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.097.196.896.2

us-gaap:EquitySecuritiesFvNiCost



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1132491103401122071026201028991028671018388745874676
Percentage of EquitySecuritiesFvNiCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesByIndustry

brka:BanksInsuranceAndFinance



Period End2020-03-312019-12-312019-09-302018-12-31
Value40845404194469444332
Percentage of EquitySecuritiesFvNiCost36.136.639.843.1

brka:CommercialIndustrialAndOther



Period End2020-03-312019-12-312019-09-302018-12-31
Value33517310342858519752
Percentage of EquitySecuritiesFvNiCost29.628.125.519.2

brka:ConsumerProducts



Period End2020-03-312019-12-312019-09-302018-12-31
Value38887388873892838783
Percentage of EquitySecuritiesFvNiCost34.335.234.737.7

us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

us-gaap:EquitySecuritiesFvNiMeasurementInput

srt:WeightedAverage, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, brka:CommonStockWarrants, us-gaap:MeasurementInputOptionVolatility, brka:ValuationTechniqueWarrantPricingModel



Period End2020-03-312019-12-31
Value0.270.26
Percentage of EquitySecuritiesFvNiMeasurementInput100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

us-gaap:SecuritiesAssets, us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value554610407108086307556678184741732121503
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs

us-gaap:FairValueInputsLevel3



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value-2264-857-1138-1361-1578-2343-1775-1906-2281-2069-2088-2405-2349-2824-3906-4373-4577-3785-4759-5255
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLosses



Period End2020-03-312019-12-312019-03-312018-12-31
Value702167176177
Percentage of FinancingReceivableAllowanceForCreditLosses100.0100.0100.0100.0

us-gaap:FinancingReceivableBeforeAllowanceForCreditLossAndFee



Period End2020-03-312019-12-31
Value1886718199
Percentage of FinancingReceivableBeforeAllowanceForCreditLossAndFee100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

brka:ManufacturedHousingLoanBalance



Period End2020-03-31
Value16691
Percentage of FinancingReceivableBeforeAllowanceForCreditLossAndFee88.5

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus

brka:ManufacturedHousingLoanBalance, us-gaap:NonperformingFinancingReceivable



Period End2020-03-31
Value123
Percentage of FinancingReceivableBeforeAllowanceForCreditLossAndFee0.7

brka:ManufacturedHousingLoanBalance, us-gaap:PerformingFinancingReceivable



Period End2020-03-31
Value16568
Percentage of FinancingReceivableBeforeAllowanceForCreditLossAndFee87.8

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear

brka:ManufacturedHousingLoanBalance



Period End2020-03-31
Value7524
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus

brka:ManufacturedHousingLoanBalance, us-gaap:NonperformingFinancingReceivable



Period End2020-03-31
Value79
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear1.0

brka:ManufacturedHousingLoanBalance, us-gaap:PerformingFinancingReceivable



Period End2020-03-31
Value7445
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear99.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear

brka:ManufacturedHousingLoanBalance



Period End2020-03-31
Value1391
Percentage of FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus

brka:ManufacturedHousingLoanBalance, us-gaap:NonperformingFinancingReceivable



Period End2020-03-31
Value16
Percentage of FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear1.2

brka:ManufacturedHousingLoanBalance, us-gaap:PerformingFinancingReceivable



Period End2020-03-31
Value1375
Percentage of FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear98.8

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear

brka:ManufacturedHousingLoanBalance



Period End2020-03-31
Value1409
Percentage of FinancingReceivableOriginatedInCurrentFiscalYear100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus

brka:ManufacturedHousingLoanBalance, us-gaap:NonperformingFinancingReceivable



Period End2020-03-31
Value8
Percentage of FinancingReceivableOriginatedInCurrentFiscalYear0.6

brka:ManufacturedHousingLoanBalance, us-gaap:PerformingFinancingReceivable



Period End2020-03-31
Value1401
Percentage of FinancingReceivableOriginatedInCurrentFiscalYear99.4

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear

brka:ManufacturedHousingLoanBalance



Period End2020-03-31
Value2722
Percentage of FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus

brka:ManufacturedHousingLoanBalance, us-gaap:NonperformingFinancingReceivable



Period End2020-03-31
Value3
Percentage of FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear0.1

brka:ManufacturedHousingLoanBalance, us-gaap:PerformingFinancingReceivable



Period End2020-03-31
Value2719
Percentage of FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear99.9

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear

brka:ManufacturedHousingLoanBalance



Period End2020-03-31
Value1556
Percentage of FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus

brka:ManufacturedHousingLoanBalance, us-gaap:NonperformingFinancingReceivable



Period End2020-03-31
Value9
Percentage of FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear0.6

brka:ManufacturedHousingLoanBalance, us-gaap:PerformingFinancingReceivable



Period End2020-03-31
Value1547
Percentage of FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear99.4

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear

brka:ManufacturedHousingLoanBalance



Period End2020-03-31
Value2089
Percentage of FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancialInstrumentPerformanceStatus

brka:ManufacturedHousingLoanBalance, us-gaap:NonperformingFinancingReceivable



Period End2020-03-31
Value8
Percentage of FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear0.4

brka:ManufacturedHousingLoanBalance, us-gaap:PerformingFinancingReceivable



Period End2020-03-31
Value2081
Percentage of FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear99.6

us-gaap:ProductOrService

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value10292101029836958192878994866283428057770775547199686264956541618158065462
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value419408398385373362362349334324323312298293279266252239
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization4.14.04.04.04.04.04.24.24.14.24.34.34.34.54.34.34.34.4

us-gaap:ProductOrService, brka:FiniteLivedAndAndIndefiniteLivedIntangibleAssetsByMajorClass

brka:InsuranceAndOther, us-gaap:CustomerRelationships



Period End2020-03-312019-12-312019-09-302018-12-31
Value5137502548744287
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization49.949.749.647.7

brka:InsuranceAndOther, us-gaap:OtherIntangibleAssets



Period End2020-03-312019-12-312019-09-302018-12-31
Value1295128612461190
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization12.612.712.713.2

brka:InsuranceAndOther, us-gaap:TrademarksAndTradeNames



Period End2020-03-312019-12-312019-09-302018-12-31
Value764759743727
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization7.47.57.68.1

brka:RailroadUtilitiesAndEnergy, us-gaap:CustomerRelationships



Period End2020-03-312019-12-312019-09-302018-12-31
Value333324315286
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization3.23.23.23.2

brka:RailroadUtilitiesAndEnergy, us-gaap:OtherIntangibleAssets



Period End2020-03-312019-12-312019-09-302018-12-31
Value59585653
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.60.60.60.6

brka:RailroadUtilitiesAndEnergy, us-gaap:TrademarksAndTradeNames



Period End2020-03-312019-12-312019-09-302018-12-31
Value27262723
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.30.30.30.3

us-gaap:ProductOrService, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

brka:InsuranceAndOther, brka:PatentsAndTechnology



Period End2020-03-312019-12-312019-09-302018-12-31
Value3096303229732790
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization30.130.030.231.0

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312012-09-302012-06-302012-03-312011-12-31
Value190001900018800189001890018900189001890018900189301880018800187001870529643140314931882586260422212273227422672250
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:IntangibleAssetsGrossExcludingGoodwill

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value409854115340624406134055340493402884026740317402254052840419403343997641575413604107314610
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value10031003101110111011101110261018993988974903901898897894892888
Percentage of IntangibleAssetsGrossExcludingGoodwill2.42.42.52.52.52.52.52.52.52.52.42.22.22.22.22.22.26.1

us-gaap:ProductOrService, brka:FiniteLivedAndAndIndefiniteLivedIntangibleAssetsByMajorClass

brka:InsuranceAndOther, us-gaap:CustomerRelationships



Period End2020-03-312019-12-312019-09-302018-12-31
Value27820279432778627697
Percentage of IntangibleAssetsGrossExcludingGoodwill67.967.968.468.4

brka:InsuranceAndOther, us-gaap:OtherIntangibleAssets



Period End2020-03-312019-12-312019-09-302018-12-31
Value3291336431693198
Percentage of IntangibleAssetsGrossExcludingGoodwill8.08.27.87.9

brka:InsuranceAndOther, us-gaap:TrademarksAndTradeNames



Period End2020-03-312019-12-312019-09-302018-12-31
Value5283528651455152
Percentage of IntangibleAssetsGrossExcludingGoodwill12.912.812.712.7

brka:RailroadUtilitiesAndEnergy, us-gaap:OtherIntangibleAssets



Period End2020-03-312019-12-312019-09-302018-12-31
Value113113117117
Percentage of IntangibleAssetsGrossExcludingGoodwill0.30.30.30.3

brka:RailroadUtilitiesAndEnergy, us-gaap:TrademarksAndTradeNames



Period End2020-03-312019-12-312019-09-302018-12-31
Value212212216216
Percentage of IntangibleAssetsGrossExcludingGoodwill0.50.50.50.5

us-gaap:ProductOrService, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

brka:InsuranceAndOther, brka:PatentsAndTechnology



Period End2020-03-312019-12-312019-09-302018-12-31
Value4591456045244446
Percentage of IntangibleAssetsGrossExcludingGoodwill11.211.111.111.0

us-gaap:InventoryFinishedGoodsNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value50114821473747084789454141504117418841794338419941954033428742894461336935033516351233333371344734303212331332963266318732073229323431142180
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterialsNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value45984492443043834249418233263172309429972990293528572789290929162851185218381855186418811876188918281827181517191693169917341713168715981066
Percentage of InventoryRawMaterialsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-312010-12-312009-12-312008-12-312007-12-31
Value7336273019719977078169535684586426362737620946112210013895307938987691875469747087456273144714776486660075594165662056002
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value7336273019719977078169535684586426362737620946112210013895307938987691875469747087456273144
Percentage of LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:LiabilityForFuturePolicyBenefits

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value201932015519422191551891818632183681806117935176081691916663163751597715405149741473714497
Percentage of LiabilityForFuturePolicyBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-312009-12-312008-12-312007-12-31
Value7047270164688926763266371653986131959748590465792183312786347684765533644976359763254621506058957452525374948748876
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CounterpartyName, us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

brka:LeeEnterprisesInc, brka:TermLoan



Period End2020-03-31
Value576
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

srt:Subsidiaries, brka:LineOfCreditAndCommercialPaperFacilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value82007100720075007300730084006600
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0

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

srt:Subsidiaries, brka:LineOfCreditAndCommercialPaperFacilities, brka:BerkshireHathawayEnergyCompanyAndSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-30
Value6800560057005700
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity82.978.979.276.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:LoansReceivableFairValueDisclosure

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-03-31
Value22061809175816971641153159871817171095141314141516161623333948624544934813893041019
Percentage of LoansReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-03-31
Value16144160521560915272148181484614676143981406614119138691392013625137041363613436131871309613051129431261212858128081154111499115481152311551115501168711997
Percentage of LoansReceivableFairValueDisclosure731.8887.3887.9899.9903.0969.724874.616549.478144.483052.981582.41271.297321.4105415.497400.095971.487913.381850.081568.880893.854834.838963.632841.024043.818546.82543.62337.32401.52969.23844.41177.3

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1766017527171351680716280
Percentage of LoansReceivableFairValueDisclosure800.5968.9974.7990.41063.4

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value1835017861173671696916459163771473514485140841413613886150151363913717136501345013202131121306712959126351289112847115891156112002120161203211991
Percentage of LoansReceivableFairValueDisclosure831.8987.3987.9999.91003.01069.724974.616649.478244.483152.981682.41371.297421.4105515.497500.096071.488013.381950.081668.880993.854934.839063.632941.024143.818646.82643.62437.32501.53944.4

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

us-gaap:LongTermDebtAndCapitalLeaseObligations

srt:Subsidiaries, brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value524152625304543555195597558356046725
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesReceivableNet



Period End2020-03-312019-12-31
Value1766017527
Percentage of NotesReceivableNet100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-31
Value1766017527
Percentage of NotesReceivableNet100.0100.0

us-gaap:ProductOrService

us-gaap:OtherAssets

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value135931323213430130971272693071325011619119391115877937560741771268685746475226697
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value15391151671491514255133859660160201559015394155891536514129135571355014219138401307012833
Percentage of OtherAssets113.2114.6111.1108.8105.2103.8120.9134.2128.9139.7197.2186.9182.8190.1163.7185.4173.8191.6

us-gaap:ProductOrService

us-gaap:OtherReceivables

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value5208432750354224418838233121307430782925
Percentage of OtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value367388342320354362313
Percentage of OtherReceivables7.09.06.87.68.59.510.7

us-gaap:ProductOrService

us-gaap:PolicyholderFunds

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value775377237686782677427675669269007864765475497357705667147259721472807123
Percentage of PolicyholderFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:PremiumsAndOtherReceivablesNet

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value347203241834511339413371031564318843128030906285782965228953288702709727544271622719023303
Percentage of PremiumsAndOtherReceivablesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:PremiumsReceivableGross

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value146991337913906137621376612452130021263812570110581131711124110221046210226999599038843
Percentage of PremiumsReceivableGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value722971506986675465266319
Percentage of PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation100.0100.0100.0100.0100.0100.0

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value221282221521920214952095520617
Percentage of PropertySubjectToOrAvailableForOperatingLeaseGross100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AirTransportationEquipment



Period End2020-03-312019-12-312018-12-31
Value802280937376
Percentage of PropertySubjectToOrAvailableForOperatingLeaseGross36.336.435.8

us-gaap:OtherCapitalizedPropertyPlantAndEquipment



Period End2020-03-312019-12-312018-12-31
Value483748624379
Percentage of PropertySubjectToOrAvailableForOperatingLeaseGross21.921.921.2

us-gaap:RailroadTransportationEquipment



Period End2020-03-312019-12-312018-12-31
Value926992608862
Percentage of PropertySubjectToOrAvailableForOperatingLeaseGross41.941.743.0

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value148991506514934147411442914298
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value14899150651493414741144291429810167
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet100.0100.0100.0100.0100.0100.00.0

us-gaap:ProductOrService

us-gaap:RegulatoryAssets

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value296328813007307331543067292829292987295047724644461744574369430643034285
Percentage of RegulatoryAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:RegulatoryLiabilities

brka:RailroadUtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value721873117454756075287506772377447599751132173156309531213094306231103033
Percentage of RegulatoryLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReinsuranceRecoverablesOnUnpaidLossesGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value2890285531053149316430602944298930483201325430763221333833073116
Percentage of ReinsuranceRecoverablesOnUnpaidLossesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value289028553105314931643060294429893048320132543076322133383482347335233307
Percentage of ReinsuranceRecoverablesOnUnpaidLossesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:RestrictedCashAndCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value456457515468385450663615493629645564519595
Percentage of RestrictedCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:RevenueRemainingPerformanceObligation

brka:ElectricityAndNaturalGas



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value88887192293567146520689071155359
Percentage of RevenueRemainingPerformanceObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0

brka:OtherSalesAndServiceContracts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value116211581196121130283094
Percentage of RevenueRemainingPerformanceObligation130.9133.0129.7129.545.147.5

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

us-gaap:ShortTermBorrowings

srt:Subsidiaries, brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value146714721380166716961857173317951832
Percentage of ShortTermBorrowings100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

srt:Subsidiaries, brka:RailroadUtilitiesAndEnergy, brka:BerkshireHathawayEnergyCompanyAndSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value20883214311925942516
Percentage of ShortTermBorrowings142.3218.3226.0155.6135.5

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

us-gaap:ShortTermDebtWeightedAverageInterestRate

srt:Subsidiaries, brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.030.0390.0410.0430.0440.0430.0410.039
Percentage of ShortTermDebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0

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

srt:Subsidiaries, brka:RailroadUtilitiesAndEnergy, brka:BerkshireHathawayEnergyCompanyAndSubsidiaries



Period End2020-03-312019-12-312019-09-302019-06-30
Value0.0240.0250.0280.034
Percentage of ShortTermDebtWeightedAverageInterestRate80.064.168.379.1

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value375235428563401558386391372591352500379419361758351052351954311852304093296280286359272615266258261837258627251321249202244839243027240302236760230289224485211431204988202106191588189074181715180269168961163881166784164265162934135785
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-6721-5243-5408-4678-4727-5015-3927-3808-2477585715018346652430703729829798307773145433982322033941738864427324418645421450494402534897335653299227500270502378125517176541578121106217642058316723128501930717793395421620
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-1.8-1.2-1.3-1.2-1.3-1.4-1.0-1.1-0.716.616.115.314.513.010.911.612.013.112.815.815.917.618.419.219.619.616.516.416.314.414.313.114.210.49.612.713.212.60.00.00.013.10.00.0

us-gaap:CommonStockIncludingAdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value3562735666356203561835630357153572135702356893570235692356713570735689357383571835678356283561835592355733558135568354993547335480360903610937278372383789837864378543781537794377793758637541381313808538042270822714126960
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest9.58.38.99.29.610.19.49.910.210.111.411.712.112.513.113.413.613.814.214.314.514.614.815.015.415.817.117.618.419.420.020.821.022.423.122.722.923.00.00.00.019.90.00.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value36703772394938473714379738133664365136583574343434293358335132333176307730383159338128572846275526772595304929724035394144724336427241113924377742105616492647514715468344402668
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.00.91.01.01.01.11.01.01.01.01.11.11.21.21.21.21.21.21.21.31.41.21.21.21.21.21.41.42.02.12.42.42.42.42.42.32.63.40.00.00.03.40.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value35235940249337333435684634277332111234650332796331595225578622416622009921583721177720549119829319329218770318222517279716878416362015946515484814845314374813875813370512916412427211972111580111269310944810640010412210070599194948179182889860862277817272153
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest93.993.993.092.492.091.191.390.790.072.771.972.472.874.075.474.573.872.672.569.368.967.366.465.464.564.065.665.263.964.963.363.762.564.864.962.461.360.90.00.00.063.50.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-9700-8125-5937-5242-4799-3109-2691-1763-1763-1763-1763-1763-1763-1763-1763-1763-1763-1763-1763-1763-1763-1763-1763-1763-1363-1363-1363-1363-1363-1363-67-67-67-67-18
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-2.6-1.9-1.5-1.4-1.3-0.9-0.7-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.6-0.7-0.7-0.7-0.7-0.7-0.7-0.7-0.7-0.7-0.6-0.6-0.6-0.7-0.7-0.7-0.0-0.0-0.0-0.0-0.0

us-gaap:StatementClassOfStock

us-gaap:TreasuryStockShares

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value18679.017337.014649.014436.014155.012897.011905.011680.011680.011680.011680.011680.011680.011680.011680.011680.011680.011680.011680.011680.011680.011680.011680.011680.09573.09573.09573.09573.09573.09573.098.098.098.098.0
Percentage of TreasuryStockShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonClassB



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value292317141265111111111111111111111110000
Percentage of TreasuryStockShares155741.6136715.2120102.099923.089429.547599.546610.312069.912069.912069.912069.912069.912069.912069.912069.912069.912069.912069.912069.912069.912069.912069.912069.912069.914713.114713.114713.114713.114713.114713.1818352.0818352.0818352.0818352.0

us-gaap:ProductOrService

us-gaap:UnbilledContractsReceivable

brka:UtilitiesAndEnergy



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value550638657718569554665
Percentage of UnbilledContractsReceivable100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:UnearnedPremiums

brka:InsuranceAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value217181978220764201132017218093190111829218448160401655216129161061424515223147681483213311
Percentage of UnearnedPremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:UnsecuredDebt

srt:Subsidiaries, brka:RailroadUtilitiesAndEnergy, brka:BerkshireHathawayEnergyCompany



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value114598581858085798577
Percentage of UnsecuredDebt100.0100.0100.0100.0100.0

Line plots across dimensions of each concept

us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock


us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock


us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:StatementClassOfStock


us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock


us-gaap:Revenues us-gaap:StatementBusinessSegments


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


us-gaap:Revenues us-gaap:ConsolidationItems


us-gaap:Revenues us-gaap:ProductOrService


us-gaap:PremiumsEarnedNet us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:Subsegments


us-gaap:InterestExpense us-gaap:ProductOrService


us-gaap:Assets us-gaap:ProductOrService


us-gaap:Liabilities us-gaap:ProductOrService


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ProductOrService


us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService, us-gaap:PropertyPlantAndEquipmentByType


us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService, us-gaap:PropertyPlantAndEquipmentByType


us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService, us-gaap:PropertyPlantAndEquipmentByType


us-gaap:PropertyPlantAndEquipmentGross us-gaap:ProductOrService


us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:ProductOrService


us-gaap:PropertyPlantAndEquipmentNet us-gaap:ProductOrService


us-gaap:Goodwill us-gaap:ProductOrService


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:ProfitLoss us-gaap:StatementEquityComponents


us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ProductOrService


us-gaap:RepaymentsOfLongTermDebt us-gaap:ProductOrService


us-gaap:RepaymentsOfLongTermDebt us-gaap:ProductOrService