WLL


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:SharesIssued
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType

us-gaap:CostsAndExpenses

us-gaap:GeneralAndAdministrativeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
us-gaap:StatementGeographical
us-gaap:StatementGeographical
us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:OperatingIncomeLoss

us-gaap:OtherNonoperatingIncomeExpense

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

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService

us-gaap:Revenues

us-gaap:Assets
us-gaap:StatementScenario

us-gaap:Liabilities
us-gaap:StatementScenario

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:StatementScenario

us-gaap:StockholdersEquity
us-gaap:StatementScenario

us-gaap:AssetsCurrent
us-gaap:StatementScenario

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:StatementScenario

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent
us-gaap:StatementScenario

us-gaap:PrepaidExpenseAndOtherAssetsCurrent
us-gaap:StatementScenario

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:StatementScenario

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:StatementScenario

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:OtherAssetsNoncurrent
us-gaap:StatementScenario

us-gaap:LiabilitiesCurrent
us-gaap:StatementScenario

us-gaap:LongTermDebtCurrent
us-gaap:StatementScenario

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent
us-gaap:StatementScenario

us-gaap:OtherLiabilitiesCurrent
us-gaap:StatementScenario
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:TaxesPayableCurrent

us-gaap:LongTermDebtNoncurrent
us-gaap:DebtInstrument
us-gaap:StatementScenario

us-gaap:DeferredFinanceCostsNoncurrentNet
us-gaap:StatementScenario
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:StatementScenario

us-gaap:OtherLiabilitiesNoncurrent
us-gaap:StatementScenario

us-gaap:OperatingLeaseLiabilityNoncurrent
us-gaap:StatementScenario

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementScenario

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

us-gaap:CommonStockValue
us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:AdditionalPaidInCapital
us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:StatementScenario

us-gaap:StockIssuedDuringPeriodValueNewIssues
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:NetCashProvidedByUsedInOperatingActivities

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

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:StatementGeographical
us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:AmortizationOfFinancingCostsAndDiscounts
us-gaap:FairValueByAssetClass
us-gaap:AssetImpairmentCharges

us-gaap:AssetRetirementObligationAccretionExpense

us-gaap:AssetRetirementObligationLiabilitiesIncurred

us-gaap:AssetRetirementObligationLiabilitiesSettled

us-gaap:AssetRetirementObligationRevisionOfEstimate
us-gaap:CounterpartyName
us-gaap:BankruptcyClaimsAmountOfClaimsFiled
us-gaap:CounterpartyName, us-gaap:Range

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CurrentIncomeTaxExpenseBenefit
us-gaap:DebtInstrument, us-gaap:VariableRate
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:Range, us-gaap:DebtInstrument
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:VariableRate

us-gaap:DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1
us-gaap:StatementScenario
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees

us-gaap:DebtorReorganizationItemsOtherExpenseIncome
us-gaap:StatementScenario

us-gaap:DebtorReorganizationItemsRevaluationOfAssetsAndLiabilities

us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:FinanceLeasePrincipalPayments

us-gaap:GainLossOnSaleOfOilAndGasProperty

us-gaap:GainLossOnSaleOfOtherAssets

us-gaap:ImpairmentOfOilAndGasProperties

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedTaxesPayable

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInRoyaltiesPayable
us-gaap:DebtInstrument
us-gaap:InterestPaid
us-gaap:StatementScenario
us-gaap:LiabilitiesSubjectToCompromisePeriodIncreaseDecrease
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireOilAndGasPropertyAndEquipment
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

us-gaap:PaymentsToAcquireOtherPropertyPlantAndEquipment

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties
us-gaap:DebtInstrument
us-gaap:ProceedsFromLongTermLinesOfCredit

us-gaap:ProceedsFromSaleOfOtherProductiveAssets

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType

us-gaap:ProductionTaxExpense

us-gaap:ReorganizationItems
us-gaap:DebtInstrument
us-gaap:RepaymentsOfLongTermLinesOfCredit
us-gaap:RestructuringCostAndReserve
us-gaap:RestructuringAndRelatedCostIncurredCost

us-gaap:ResultsOfOperationsTransportationCosts
us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
us-gaap:StatementScenario

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType, us-gaap:GranteeStatus
us-gaap:AwardType, us-gaap:Vesting

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
us-gaap:StatementEquityComponents
us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardGross

us-gaap:UnrealizedGainLossOnDerivatives

wll:AssetRetirementObligationLiabilitiesRelatedToSoldAssets

wll:CancellationOfPredecessorEquity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
wll:CancellationOfPredecessorEquityShares
us-gaap:StatementScenario
wll:DebtorReorganizationItemsStockIssuedToEquityHolders
us-gaap:StatementScenario
wll:DebtorReorganizationItemsSuccessFeesIncurred
us-gaap:StatementScenario
wll:DebtorReorganizationItemsWarrantsIssuedToEquityHolders
us-gaap:StatementScenario
wll:DebtorsReorganizationItemsCancellationOfPredecessorEquity

wll:ExplorationExpenseAndImpairmentOfOilAndGasProperties
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
wll:OilAndGasNetWellsDrilledNumber

wll:OilAndGasPropertyLeaseOperatingExpense

wll:OtherIncomeExpenseTotal
us-gaap:FairValueByAssetClass, us-gaap:MeasurementInputType
wll:ProvedPropertyMeasurementInput

wll:PurchasedGasExpense

wll:ReorganizationItemsPaidInCash
us-gaap:AwardType
wll:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsNumberOfSimulations

wll:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumFairValueGrantPerNonemployeeDirector
dei:LegalEntity, us-gaap:StatementEquityComponents
wll:StockholdersEquityAdjustedBalanceShares

us-gaap:AccountsPayableTradeCurrent
us-gaap:StatementScenario

us-gaap:AccruedRoyaltiesCurrent

us-gaap:AssetRetirementObligation
us-gaap:StatementScenario

us-gaap:AssetRetirementObligationCurrent
us-gaap:CounterpartyName
us-gaap:BankruptcyClaimsAmountPaidToSettleClaims
us-gaap:CounterpartyName, us-gaap:SubsequentEventType

us-gaap:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities

us-gaap:CapitalizedCostsMineralInterestsInProvedProperties

us-gaap:CapitalizedCostsMineralInterestsInUnprovedProperties

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross
us-gaap:StatementScenario

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNet

us-gaap:CapitalizedCostsUncompletedWellsEquipmentAndFacilities
us-gaap:ClassOfWarrantOrRight
us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractualObligation
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased

us-gaap:ContractualObligationDueInFourthYear

us-gaap:ContractualObligationDueInNextTwelveMonths

us-gaap:ContractualObligationDueInSecondYear

us-gaap:ContractualObligationDueInThirdYear

us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrument
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrumentUnamortizedDiscount
us-gaap:DebtInstrument
us-gaap:DebtWeightedAverageInterestRate

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsDerivativeInstruments

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations

us-gaap:DeferredTaxLiabilitiesLeasingArrangements
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeAssetFairValueGrossLiability
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:DerivativeAssets
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:DerivativeAssetsCurrent
us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:DerivativeAssetsNoncurrent
us-gaap:FinancialInstrument
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:DerivativeInstrumentsAndHedgesLiabilities

us-gaap:DerivativeInstrumentsAndHedgesLiabilitiesNoncurrent

us-gaap:DerivativeLiabilities
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:DerivativeLiabilitiesCurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:DerivativeLiabilitiesNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeLiabilityFairValueGrossAsset
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation
us-gaap:Energy
us-gaap:DerivativeNonmonetaryNotionalAmount
us-gaap:Energy, us-gaap:StatementScenario
us-gaap:Energy, us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk
us-gaap:Energy, us-gaap:StatementScenario, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType
us-gaap:Energy, us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeSwapTypeAverageFixedPrice

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:EnergyRelatedInventoryPetroleum
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:EscrowDeposit

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:FreshStartAdjustmentIncreaseDecreaseAccountsPayable
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:FreshStartAdjustmentIncreaseDecreaseAccruedLiabilities
us-gaap:StatementScenario
us-gaap:FreshStartAdjustmentIncreaseDecreaseAccumulatedDepreciationAndAmortization
us-gaap:StatementScenario
us-gaap:FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:StatementScenario
us-gaap:FreshStartAdjustmentIncreaseDecreaseCommonStock
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:FreshStartAdjustmentIncreaseDecreaseLiabilities
us-gaap:StatementScenario
us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherAssetsNoncurrent
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherNoncurrentObligations
us-gaap:StatementScenario
us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherPropertyAndEquipment
us-gaap:StatementScenario
us-gaap:FreshStartAdjustmentIncreaseDecreaseReceivablesNet
us-gaap:StatementScenario
us-gaap:FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent
us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment
us-gaap:StatementScenario
us-gaap:FreshStartAdjustmentIncreaseDecreaseRetainedEarningsDeficit

us-gaap:InterestPayableCurrent
us-gaap:StatementScenario

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LiabilitiesSubjectToCompromise
us-gaap:StatementScenario
us-gaap:StatementScenario
us-gaap:LiabilitiesSubjectToCompromiseOtherLiabilities
us-gaap:DebtInstrument
us-gaap:LineOfCredit
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:MaterialsSuppliesAndOther

us-gaap:OilAndGasReclamationLiabilityNoncurrent
us-gaap:StatementScenario

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLossCarryforwards

us-gaap:OperatingLossCarryforwardsValuationAllowance

us-gaap:OtherSundryLiabilitiesCurrent

us-gaap:PostconfirmationStockholdersEquity

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentOther
us-gaap:StatementScenario

us-gaap:ReorganizationValue

us-gaap:ReorganizationValuePresentValueOfDiscountedCashFlowsOfEmergingEntity
us-gaap:Range

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
us-gaap:StatementScenario

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount

wll:AccumulatedDepreciationDepletionAndAmortizationFreshStart
us-gaap:StatementScenario
us-gaap:DebtInstrument
wll:CashBalancePriorToMandatoryBorrowingRepayment
us-gaap:DebtInstrument
wll:DebtCovenantConsolidatedCurrentAssetsToCurrentLiabilitiesRatioRequirementMinimum
us-gaap:DebtInstrument
wll:DebtCovenantTotalDebtToEarningsBeforeInterestTaxesDepreciationAmortizationAndExplorationExpenseRatioRequirement
us-gaap:DebtInstrument
wll:DebtInstrumentCommodityHedgesCoveringProductionCurrentPercent
us-gaap:DebtInstrument
wll:DebtInstrumentCommodityHedgesCoveringProductionFromProvedReservesMaximumPercent
us-gaap:DebtInstrument
wll:DebtInstrumentCommodityHedgesCoveringProductionYear2Percent
us-gaap:DebtInstrument
wll:DebtLeverageRatio
us-gaap:DebtInstrument
wll:DebtThresholdPercentDividendPaymentsAndDistributions

wll:DeferredTaxAssetsLeaseObligation

wll:DeferredTaxLiabilitiesTrustDistributions

wll:FinanceLeaseRightOfUseAssetAccumulatedDepreciation

wll:FinanceLeaseRightOfUseAssetGross
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseAccumulatedDepreciationAndAmortizationFinanceLease
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseAccruedInterest
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseAssets
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseLiabilitiesCurrent
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseLiabilitiesNoncurrent
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseLandAndBuilding
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseLeaseAssetsAndLiabilities
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseAssetsNet
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseLiabilitiesCurrent
us-gaap:StatementScenario
wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseLiabilitiesNoncurrent

wll:LiabilitiesNotSubjectToCompromise
us-gaap:StatementScenario
us-gaap:StatementScenario
wll:LiabilitiesSubjectToCompromiseAccountsPayable
us-gaap:StatementScenario
wll:LiabilitiesSubjectToCompromiseAccruedInterestOnDebt
us-gaap:StatementScenario
wll:LiabilitiesSubjectToCompromiseAccruedLeaseOperatingExpenses
us-gaap:StatementScenario
wll:LiabilitiesSubjectToCompromiseAccruedLiabilities
us-gaap:StatementScenario
wll:LiabilitiesSubjectToCompromiseAccruedLiabilitiesAndOther
us-gaap:StatementScenario
wll:LiabilitiesSubjectToCompromiseLiabilitiesReinstated
us-gaap:StatementScenario
wll:LiabilitiesSubjectToCompromiseOpeatingLeaseObligations
us-gaap:StatementScenario
wll:LiabilitiesSubjectToCompromiseOperatingLeaseObligations
us-gaap:DebtInstrument
wll:LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity
us-gaap:DebtInstrument
wll:LineOfCreditFacilityMaximumAggregateCommitments

wll:OilAndGasAccruedLeaseOperatingExpensesCurrent
us-gaap:StatementScenario

wll:OperatingLeaseRightOfUseAssetAccumulatedDepreciation

wll:OperatingLeaseRightOfUseAssetGross

wll:OperatingLossCarryforwardsExpirationAmount
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
wll:ProductiveWellNumberOfWellsNet

wll:StockholdersEquityAdjustedBalance
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

wll:WeightedAverageCostOfCapitalRate
us-gaap:StatementScenario

Plots across concepts


IncomeStatement
Income Loss From Continuing Operations 
Before Income Taxes Extraordinary Items Noncontrolling Interest
Expenses
Income Tax Expense Benefit
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Derivative Assets
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Operating Lease Right Of Use Asset
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Other Liabilities Noncurrent
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Profit Loss
Shares
Weighted Average Number Of Diluted Shares Outstanding
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four

Tables

  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ▃▃▃▃████████████████▆▅▄▄▄▄▄▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁0.0390.0390.0380.0380.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.091750.07250.0630.05250.05150.05150.05150.0510.0420.030250.030.030250.030.030.030.029750.029750.029750.029750.029750.02950.02950.02950.02950.01475NANANA
 us-gaap:SharesIssued dei:LegalEntity,us-gaap:StatementEquityComponents wll:SuccessorBankruptcy,us-gaap:CommonStockNANANA38.051NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock██▁39.09139.05438.051NANA91.63791.63791.74491.76191.89191.83192.06792.1392.18592.32692.095368.02368.133368.009367.175289.677251.611209.702206.441206.456206.472204.487168.346120.519120.443120.614120.102120.107120.134119.39118.582118.584118.585118.565118.105118.109118.113118.112117.968117.973102.884102.872
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁39.06738.698NA38.05191.46491.42991.39NA91.29991.28691.235NA91.82391.86991.31NA90.698590.683590.6525NA70.104556.5097551.09175NA51.0357551.032542.2475NA30.016530.0067529.98275NA29.8767529.7252529.81575NA29.73129.7132529.724NA29.6347529.6647529.4585NA26.2267529.6122529.5765
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁39.06738.698NA38.05191.46491.42991.39NA91.29991.28691.235NA90.96790.9490.892NA90.698590.683590.6525NA70.104556.5097551.09175NA51.0357551.032542.2475NA29.75629.74229.73075NA29.663529.482529.447NA29.4077529.405529.37925NA29.3452529.3432529.31075NA26.07425.4972525.4555
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted 39.067NANANANA91.429NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasic ▇▇▇▇▇▆▁▇▇▇▇▇▇▇▇▆▆▇▇▇▅▆▆▇▁▇▇▅███▇██▇▇▇█▇▇██▇▇▇█▇-1.57-0.02-0.0300000000000000271.062.6-6.28-39.7-1.61-0.21-0.06-0.762.251.330.020.17-8.81-3.16-0.72-0.96-1.6000000000000014-9.88-5.32-3.36-1.92-36.56-2.92-2.52-10.765.325.083.68-2.06.884.562.922.762.85.123.362.167.06.920.642.240.244.723.2
us-gaap:EarningsPerShareDiluted ▇▇▇▇▇▆▁▇▇▇▇▇▇▇▇▆▆▇▇▇▅▆▆▇▁▇▇▅███▇██▇▇▇█▇▇██▇▇▇█▇-1.57-0.02-0.0300000000000000271.062.6-6.28-39.7-1.61-0.21-0.06-0.762.21999999999999981.320.020.16-8.81-3.16-0.72-0.96-1.6000000000000014-9.88-5.32-3.36-1.92-36.56-2.92-2.52-10.725.285.043.64-2.06.844.562.882.762.85.083.322.126.966.840.642.240.244.242.92
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AllocatedShareBasedCompensationExpense ▄▄2.02.0NANANA1.01.02.0-5.04.06.00.07.05.07.03.06.07.06.06.06.06.07.0NANANA7.0NANANA6.7NANANA6.7NANANA4.2NANANANANANANANA
us-gaap:CostsAndExpenses ▂▂▁▁▁▂█▂▂▂▂▁▂▂▂▃▂▂▂▂▂▂▂▂▆▂▂▃▂▂▂▂▂▂▂▂▂▁▂▂▁▁▂▂▁▁▁409.431305.754207.50230.877188.471608.7813854.046412.454351.253360.383435.486220.68397.33476.633416.8921388.567805.145368.229448.823368.915464.729750.613528.931570.4272968.006816.699689.1611240.383561.683584.279554.837799.611525.698455.598475.607447.032397.253260.894406.261400.434155.183163.688399.997308.428279.315175.157211.756
us-gaap:GeneralAndAdministrativeExpense ▁▁▁▁▂▃▅▄▃▄▄▃▃▃▃▃▃▃▃▄▄▄▅▄▅▅▅█▄▄▃▃▆▃▃▃▃▃▄▂▂▂▂▂▂▂▁11.99510.29111.38910.34516.51328.13647.16735.17229.8932.57334.97428.26831.90131.60131.4831.64430.08431.94330.61734.65133.90833.52344.79638.82844.82144.98743.9872.25237.0735.55532.33429.52850.36829.21328.88523.96225.03425.20934.36822.51523.14420.91318.41316.17819.4815.40213.634
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▇▇▇▇█▆▁▇▇▇▇██▇▇▆▆▇▇▇▇▇▇▇▃▇▇▆███▇██████████-61.489-0.946-1.0528.085182.079-575.343-3628.571-73.894-19.06717.795-93.78205.335121.42.1215.012-961.256-528.73-104.208-126.447-443.312-335.504-411.03-236.924-146.911-2459.965-226.69-159.929-544.288251.448251.343185.412-79.151305.287207.971137.764130.057133.229241.28157.44598.203332.374317.518NANANANANA
us-gaap:IncomeTaxExpenseBenefit NANA0.147-12.185-55.346-1.0280.073.5930.023.482-24.8551.3730.00.00.0-162.978-242.298-38.227-39.476-270.047357.551-109.984-65.166-48.184-594.847-77.395-53.801-190.59593.48799.91776.361-19.875101.19673.02751.5248.36850.11690.42958.99935.373126.139114.36912.8138.84735.88777.15352.903
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementGeographical country:CANANA3.0-15.0-55.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeTaxesPaidNet us-gaap:StatementGeographical country:CANANA6.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestExpense ▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂█▃▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁3.9815.1035.9522.12811.37916.42545.2545.77348.44748.72848.09947.91648.32848.33152.89947.44747.69347.93748.011312.47584.57878.6681.90786.14184.55189.17674.25749.82139.63239.04542.14443.35724.98823.12121.4720.11518.73417.90518.45616.64916.1315.27914.45813.17514.57915.63215.692
us-gaap:InterestPaidNet NANA6.0210.301NANANA7.19577.323NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted NA-0.946-1.19740.27237.425-574.315-3628.571-147.487-19.067-5.687-68.925NANANANA-798.278-286.432-65.981-86.957-173.261-693.052-301.041-171.748-98.689-1865.108-149.274-106.111-353.681157.975151.444109.069-59.265204.101135.086.26381.70383.134150.88298.4762.889206.235203.149NANANANANA
us-gaap:OperatingIncomeLoss ▇▇▇▇▇▆▁▇▇▇▇██▇█▆▇▇▇▇▇▇▇▇▇█▇████████████████████-57.7851.6374.77230.207-65.913-517.181-3609.2-31.85324.63865.881-45.997252.553169.36549.7798.191-914.155-480.954-56.714-77.506-130.983-297.582-153.61-246.031-60.96618.13128.01225.586177.722326.215370.033311.169280.311316.764269.528252.806235.635204.23201.9263.176243.362233.543255.572214.789204.965172.341174.665157.192
us-gaap:OtherNonoperatingIncomeExpense ▂█▂▁▂▁▁▃▂▃▂▃▂▅▄▂▁▂▃▂▂0.2772.520.130.0060.1390.076-0.0040.50.1440.6420.3160.6980.3631.4890.880.346-0.0830.4430.610.1460.115NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▇████▇▁▇██▇████▆▇▇▇▇▆▇▇▇▄▇▇▇███▇███████████-61.489-0.946-1.19740.27237.425-574.315-3628.571-147.487-19.067-5.687-68.925203.962121.42.1215.012-798.278-286.432-65.981-86.971-173.265-693.055-301.046-171.758-98.727-1865.118-149.295-106.128-353.693157.961151.426109.051-59.276204.091134.94486.24481.68983.113150.85198.44662.83206.235203.14919.414NANANANA
 us-gaap:ProfitLoss dei:LegalEntity wll:SuccessorBankruptcyNANANA40.27NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss dei:LegalEntity,us-gaap:StatementEquityComponents wll:SuccessorBankruptcy,us-gaap:RetainedEarningsNANANA40.27NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-61.489-0.946NANA237.425-574.315-3628.571NA-19.067-5.687-68.925203.962121.42.1215.012-798.278-286.432-65.981-86.957-173.261-693.052-301.041-171.748-98.689-1865.108-149.274-106.111-353.681157.975151.444109.069-59.265204.101134.95686.26381.70383.134150.88298.4762.889206.235203.14919.414NANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▄▃▂▁▂▁▃▄▄▄▄▅▆▅▅▅▃▃▄▅▂▄▃▄▅▆▅▇██▇▇█▆▆▆▅▅▆▅▅▅▄▄▄▄▄351.646307.391212.27461.084122.55891.6244.846380.601375.891426.264389.489473.233566.695526.403515.083474.412324.191311.515371.317524.167129.225339.583292.007423.516508.041590.009529.232696.095813.131835.622740.249720.46830.985663.569613.371577.089530.482502.174563.706498.637487.557481.206432.221413.468373.734377.627351.27
us-gaap:Revenues ▄▃▂▁▂▁▃▄▄▄▄▅▆▅▅▅▃▃▄▅▂▄▃▄▅▆▅▇██▇▇█▆▆▆▅▅▆▅▅▅▄▄▄▄▄351.646307.391212.27461.084122.55891.6244.846380.601375.891426.264389.489473.233566.695526.403515.083474.412324.191311.515371.317524.167129.225339.583292.007423.516508.041590.009529.232696.095813.131835.622740.249720.46830.985663.569613.371577.089530.482502.174563.706498.637487.557481.206432.221413.468373.734377.627351.27
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets ▁▁▁▁▂▂▂▄▄▄▄▄▄▄▄▅▅▅▅▅▆▆▆▆▆███▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▂2108.1142096.9482043.942098.4563730.3693732.2034526.3037636.7217774.8817775.7267751.7957759.5737709.3397561.6247532.7088403.0348502.5789405.4199387.7079876.14210065.74410805.70611181.23711389.08511672.1614213.92214452.01314019.5049617.419358.9688981.7248833.479126.9738117.717642.3787272.4196929.456510.5846219.6556045.6095647.5065286.9324978.5584648.777NANANA
us-gaap:Liabilities ▁▁▁▁▄▄▄▄▄▄▄▃▄▄▄▄▄▄▄▅▅▆▆▆▇▇▇█▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▂938.342868.138815.136868.973999.9273910.4824131.63611.753604.9243575.0993549.4463489.2573645.4863622.3583597.0954483.8923786.6054409.3124324.444726.955461.7256040.7556588.5376630.4976822.1427506.0917662.3238316.465355.1795261.8335040.2274996.7715236.9134437.3594101.773819.2473562.3563230.7633094.4733016.4782683.4552531.1242427.482117.462NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▁▁▁▁▂▂▂▄▄▄▄▄▄▄▄▅▅▅▅▅▆▆▆▆▆███▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▂2108.1142096.9482043.942098.4563730.3693732.2034526.3037636.7217774.8817775.7267751.7957759.5737709.3397561.6247532.7088403.0348502.5789405.4199387.7079876.14210065.74410805.70611181.23711389.08511672.1614213.92214452.01314019.5049617.419358.9688981.7248833.479126.9738117.717642.3787272.4196929.456510.5846219.6556045.6095647.5065286.9324978.5584648.777NANANA
us-gaap:StockholdersEquity ▂▂▂▂▁▁▂▅▅▅▅▆▅▅▅▅▆▆▆▆▆▆▆▆▆██▇▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄1169.7721228.811228.8041229.486-269.558-178.279394.7034024.9714169.9574200.6274202.3494270.3164063.8533939.2663935.6133919.1424715.9734996.1075055.3195141.234596.0534756.9824584.7264750.6044841.9966699.7996781.6375694.9744254.1494089.0393933.3833828.5673881.9173672.1983532.4433444.9883358.8963271.6023116.9323020.8572955.7182747.4752542.7452531.315NANANA
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▁▁▁▁▄▄▆▂▂▂▂▂▂▂▂▇▂▂▁▄▂▂▂▃▃▃▄▅▃▄▅▆█▆▂▂▂▂▂▂▂▁▂▁248.016245.48190.421177.568731.912713.0591027.323330.983355.314343.05305.036398.426352.733342.158328.5291189.628269.197291.138244.022622.602286.638319.526419.506535.19558.174597.334762.951842.999511.998733.123822.6071069.6181400.8141096.816366.684384.412392.502323.699328.379298.703268.57243.215270.284233.543NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁▁▁▁█▇█▁16.65224.70425.60713.702547.354492.088566.2738.652NA6.681.69213.60714.18716.61330.515879.37911.17223.24316.42955.97518.32915.3381.06116.05337.73160.154105.91578.128.053227.083406.437699.461025.57923.3128.18244.826.0756.8079.82515.8116.08811.0895.02618.9523.21115.52113.053
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▁▁▁▁▂▇█▁19.05327.10428.36726.93549.407518.875566.2738.652NA6.681.69213.60714.18716.61330.515879.37911.17223.243NA73.225NANANA16.053NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▂▂▁▁▁▂▃▄▄▄▄▄▄▄▃▄▃▂▂▂▂▃▃▄▅▇▇█▆▇▅▅▅▅▄▄▅▄▄▃▃▂▃▂214.223203.058142.83128.577136.881165.492245.909308.249294.422292.972278.242294.468315.929287.494270.304284.214225.291210.204184.63173.919216.378233.059261.728332.428354.488454.506505.127543.172453.535464.474378.111341.177361.512345.792331.796318.265345.352293.672293.863262.515230.942211.937244.016199.713NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▁▁▂▂▂▂▃▁▁▁▂▂▂▃▂▂▃▃▄▂▁▂▃▂▄▅▄█▃▄▃▃▁▂▂▂▂14.7415.31819.22422.05618.72228.69235.80113.19615.85417.42719.82322.00922.61738.05127.7126.03532.73430.72742.96326.31217.87721.92728.92327.9839.96750.59841.59186.1530.4141.56638.05928.98113.72326.01126.70621.34721.075NANA20.377NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:PropertyPlantAndEquipmentGross NA1939.0821886.6651902.3285044.8794994.0986202.78512990.69612894.46712787.00812565.01112329.87112129.58411805.39911608.28211428.17412931.97613740.99613527.93713365.48913856.95214339.77814293.9714072.80213960.17915990.22415975.11315226.28412421.74211655.68610867.29510271.53510473.2279572.8599918.4289353.7368836.248303.5117856.2477727.2577231.9576797.3266360.4545986.047NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:StatementScenario wll:FreshStartAccountingAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:StatementScenario wll:ReorganizationAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NA126.07273.86919.447NA2016.6192760.8125735.2395528.5115391.0645190.4725003.5094809.5584620.8684429.9474244.7354734.3514699.3424482.884222.0714188.53925.73625.2943323.1023013.5483388.9643338.8813083.5723431.8153158.9172889.912676.492907.0552691.8272788.2992590.2032416.8152238.742070.2592088.5171961.3651845.6521737.2161630.824NANANA
us-gaap:PropertyPlantAndEquipmentNet NA1813.011812.7961882.8812959.6132977.4793441.9737255.4577365.9567395.9447374.5397326.3627320.0267184.5317178.3357183.4398197.6259041.6549045.0579143.4189668.45210414.07810668.67610749.710946.63112601.2612636.23212142.7128989.9278496.7697977.3857595.0457566.1726881.0327130.1296763.5336419.4256064.7715785.9885638.745270.5924951.6744623.2384355.223NANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:StatementScenario wll:FreshStartAccountingAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:StatementScenario wll:ReorganizationAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset NANA20.866NANANANA26.987NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset us-gaap:StatementScenario,us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment wll:ReorganizationAdjustments,wll:CorporateOfficeLeaseAgreementModificationNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▂▂▂▂▂▂▃▃▃▂▂▂▂▂▁▁▂▄▆▆▆▄▅▆▅▃▅▆▄▅█▇▆▇▇▅▅▅▄▄▄▃▃▁39.18938.45840.72338.00737.0141.66557.00750.28153.61136.73248.73834.78536.5834.93525.84429.96735.75672.62798.628110.122110.65472.10293.055104.19591.11159.59491.425104.84369.49881.231136.197120.277108.157112.586118.73795.72689.57892.37973.78474.8676.56258.65552.41325.785NANANA
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LiabilitiesCurrent ▂▁▁▁▃▃█▁▂▃▁▁▂▂▂▃▁▁▁▁▁▁▁▂▂▂▂▃▂▂▂▂▂▂▂▂▂▁▂▂▁▁▁▁611.538461.66321.994311.9081234.071191.8093878.423550.414806.5131094.916527.797536.931625.926673.723567.9841553.328459.451468.733443.329478.331397.944427.379491.182599.813763.935802.871881.2611208.516832.061941.479727.358777.685988.436928.857819.609636.979652.575543.664634.348567.034438.386484.629528.282459.205NANANA
us-gaap:LongTermDebtCurrent NANANANA912.259912.2593423.352NA256.018542.716NANANANANA958.713NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:StatementScenario wll:ReorganizationAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent NANA4.031NANANANA7.346NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▁▁▁▁▁▁▂▂▃▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▃▄▄█▅▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂22.87728.83220.15514.80914.03718.53363.74664.263130.01789.04996.61573.17874.75764.6276.45669.744107.70695.49985.08756.8345.70248.179.35694.105125.893189.404198.717429.97226.337216.076210.133158.739158.813104.803109.312110.663112.137109.635121.969142.827112.52696.00597.27484.789NANANA
us-gaap:OtherLiabilitiesCurrent ▂▂▁▃▂▃▃▃▃▃▃▂▄▄▃▃▂▂▂▄▃▃▃▃▆▆▆▆▄█▄█▇▆▆▇▇▆▆▆▅▅▅▆35.14336.0740.47663.98746.32748.8352.21153.59765.04865.79660.3833.872109.39998.74776.03351.5923.06624.86331.9781.16660.59855.45760.70850.261142.316148.343171.728169.193109.172219.525109.607214.109200.262149.064143.791180.622175.104146.012169.915157.214133.752115.02113.77153.062NANANA
us-gaap:TaxesPayableCurrent ▂▁▁▂▁▁▁▃▂▃▃▃▄▃▃▃▂▂▃▄▅▅▅▅▇▇▆▇██▆▅▇▅▄▄▅▄▄▃▄▃▃▃16.71216.20111.99716.98513.97212.26513.76426.84422.74228.08828.33531.35738.49433.20829.95428.77123.09620.44730.54739.54745.86847.10241.92547.78963.3965.01954.463.82271.48669.50555.26850.05261.73544.77739.18233.28342.3835.09936.11331.19534.13931.19426.68330.291NANANA
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LongTermDebtNoncurrent ▁▄▇█115.0245.0360.0400.328NANANA2799.8852605.0232303.8642839.4022792.3212835.1282778.2322861.4282764.7162931.4433274.8073168.2593535.3034085.6294960.9215334.5955197.7045254.6465245.3545236.1875628.7822753.3472653.5122653.6742653.8342653.9912000.01850.01800.01600.01420.01240.01380.01200.01060.0980.0800.0NANANA
us-gaap:DeferredFinanceCostsNoncurrentNet NANANANA1.834NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:StatementScenario wll:ReorganizationAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:StatementScenario,us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment wll:ReorganizationAdjustments,wll:FinancingCostCreditAgreementNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet NANANANA69.84769.84769.84773.593NANANA1.373NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet us-gaap:StatementScenario wll:FreshStartAccountingAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▂▄▃▂▂▁▂▃▃▃▃▃▄▃▄▄▇█▆▃▄▄▄▃▃▄▂▂▁▁▁▁▃▃▃▃▃▃▃▃▃▃▃▃12.90945.323.86319.72318.167.74520.5524.92827.41129.90932.32627.08836.49134.88936.00536.64276.35993.16265.63133.69936.9639.38736.15434.66427.79940.31221.54920.4864.3264.34.3654.21226.69726.07225.46125.85227.57726.97326.39625.77626.66925.87624.66623.952NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▄▆█16.26516.90717.41517.749NANA30.14731.72233.59613.013.898NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA3.572NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA3.255NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA2.898NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA1.903NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA9.349NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▂▂▂▂▁▁▂▅▅▅▅▆▅▅▅▅▆▆▆▆▆▆▆▆▆██▇▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄1169.7721228.811228.8041229.486-269.558-178.279394.7034024.9714169.9574200.6274202.3494270.3164063.8533939.2663935.6133919.1424715.9734996.1075055.3195141.234596.0534756.9824584.7264750.6044841.9966699.7996781.6375694.9744254.1494089.0393933.3833828.5673881.9173672.1983532.4433444.9883358.8963271.6023116.9323020.8572955.7182747.4752542.7452531.315NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ▁██1169.7721228.811228.804NANA-178.279394.7034024.9714169.9574200.6274202.3494270.3164063.8533939.2663935.6133919.1424715.9734996.1075063.2675149.1924604.0194764.9514592.74758.5884850.0186707.8316789.695703.0444262.2314097.1353941.4973836.6993890.063680.3513540.6083453.1723367.0943279.8213125.1823029.1312964.0512755.8082551.0782531.3152465.3512460.3342343.74
us-gaap:CommonStockValue ▃▃▃▃████████████████▆▅▄▄▄▄▄▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁0.0390.0390.0380.0380.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.091750.07250.0630.05250.05150.05150.05150.0510.0420.030250.030.030250.030.030.030.029750.029750.029750.029750.029750.02950.02950.02950.02950.01475NANANA
us-gaap:AdditionalPaidInCapital ▁▁▁▁████████████████▇▆▆▆▆▆▆▄▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁1193.0951190.6441189.6931189.1786410.416409.6276408.2946409.9916407.496419.0936415.1286414.176411.6696408.4826406.9496405.496403.7676397.4696390.76389.4355671.0745138.9894665.7344659.8684652.5714645.2664577.8323385.0941590.6351583.5011579.2881583.5421578.0331572.8351568.0451566.7171562.0251557.3451552.8081554.2231550.81547.3421543.9831549.822NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▆▆▆▆▁▁▁▄▄▄▄▄▄▄▄▄▅▅▅▅▅▆▆▆▆█████████▇▇▇▇▇▇▇▇▇▇-23.36238.12739.07340.27-6680.06-6587.998-6013.683-2385.112-2237.625-2218.558-2212.871-2143.946-2347.908-2469.308-2471.428-2486.44-1688.162-1401.73-1335.749-1248.572-1075.311-382.259-81.21890.53189.2192054.3272203.6012309.7122663.3932505.4182353.9742244.9052304.172100.0691965.3821879.3881797.9541715.0891564.4771466.2761403.6561197.69994.81975.666NANANA
 us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:StatementScenario wll:FreshStartAccountingAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:StatementScenario wll:ReorganizationAdjustmentsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues NANANANANANANANANANANANANANANANANANANANANANANA0.00.060.5371039.5NANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues dei:LegalEntity wll:SuccessorBankruptcyNANANA1159.856NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues dei:LegalEntity,us-gaap:StatementEquityComponents wll:SuccessorBankruptcy,us-gaap:AdditionalPaidInCapitalNANANA1159.818NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues dei:LegalEntity,us-gaap:StatementEquityComponents wll:SuccessorBankruptcy,us-gaap:CommonStockNANANA0.038NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapitalNA-0.001NANANANANANANANANANANANANANANANANANANANANA0.00.060.5351039.465NANANANANANANANANANANANANANANANANANANANA
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 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementScenario,us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment wll:ReorganizationAdjustments,wll:EquityIssuedToPredecessorAndHoldersOfUnvestedCashSettledEquityAwardsNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementScenario,us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment wll:ReorganizationAdjustments,wll:EquityIssuedToUnsecuredClaimHoldersNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁2.4552.309NANA0.7871.3332.068NA-3.5313.9654.6512.4264.1471.5334.5632.596.2986.8225.9316.1356.4826.4866.5447.3127.3056.8266.6556.1816.0314.3146.7325.6065.1984.9046.7284.6924.684.5754.2433.4233.4593.4633.1642.2862.1952.1462.244
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▇▃▁183.246153.19370.52811.64NA30.04937.213235.035138.992233.424148.509284.967263.756310.413232.867286.70399.343110.99380.07NANANANANANANANANANANANANANANANANANANA352.992328.329275.536374.163214.055277.022280.134243.586196.547
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄▅█-60.106-36.85-27.493-8.614NA-76.255-120.181-162.398-148.804-227.178-195.467-235.622-315.132-224.853-177.447-204.203238.586-204.126243.14NANANANANANANANANANANANANANANANANANANA-213.052-493.156-420.267-445.357-401.256-346.496-277.942-165.631-124.505
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▂▇█-131.191-117.606-41.603-25.498NA-1.192640.589-63.9853.132-1.25835.043-49.92548.95-99.462-904.284785.707-350.099.947-380.006NANANANANANANANANANANANANANANANANANANA-145.926174.55139.7377.257173.27585.215-14.502-75.487-70.949
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▅▇█▁-8.051-1.2631.432-22.472NA-47.398557.6218.652-6.684.988-11.915-0.58-2.426-13.902-848.864868.207NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit NANA0.0-14.501-55.3460.0-3.74673.5930.023.482-24.855NANANANA-162.054-239.137-36.911-37.586-262.742357.438-109.983-65.169-48.184-594.425-77.311-53.95-185.52594.14792.56275.361-15.7393.97675.53851.09849.71351.97589.3257.57336.11125.164112.80410.7640.33636.05771.84551.573
us-gaap:DepreciationDepletionAndAmortization ▂▂▂▁▂▂▅▅▅▅▅▅▅▅▅▇▅▆▆▇▇█████▇▇▇▇▆▆▆▆▅▅▅▄▄▃▃▃▃▃▃▃▃51.61853.72957.39220.1171.2483.549183.968204.322211.025203.009198.132197.11197.006199.294187.919275.651212.846220.035240.407270.705284.569304.016312.292321.216316.147322.411283.519300.113285.658268.509235.265247.381219.53223.446201.159188.428179.587160.589156.12127.335122.89110.25107.728104.06197.70494.58397.549
us-gaap:IncreaseDecreaseInAccountsReceivable ▃█▃▁11.92558.03214.852-7.752NA-90.271-62.28920.2672.26313.588-11.775-21.34828.29918.025-13.40559.5613.83826.78410.697-35.794-23.189-25.733-70.7-19.026-99.675-50.621-38.045-129.976-10.93986.36136.936-20.33515.7213.99613.531-27.08751.68-0.19131.34831.57319.005-32.07944.30317.35813.2460.06216.965
us-gaap:NetCashProvidedByUsedInOperatingActivities █▇▃▁183.246153.19370.52811.64NA30.04937.213235.035138.992233.424148.509284.967263.756310.413232.867286.70399.343110.99380.07NANANANANANANANANANANANANANANANANANANA352.992328.329275.536374.163214.055277.022280.134243.586196.547
us-gaap:ProfitLoss ▇████▇▁▇██▇████▆▇▇▇▇▆▇▇▇▄▇▇▇███▇███████████-61.489-0.946-1.19740.27237.425-574.315-3628.571-147.487-19.067-5.687-68.925203.962121.42.1215.012-798.278-286.432-65.981-86.971-173.265-693.055-301.046-171.758-98.727-1865.118-149.295-106.128-353.693157.961151.426109.051-59.276204.091134.94486.24481.68983.113150.85198.44662.83206.235203.14919.414NANANANA
 us-gaap:ProfitLoss dei:LegalEntity wll:SuccessorBankruptcyNANANA40.27NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss dei:LegalEntity,us-gaap:StatementEquityComponents wll:SuccessorBankruptcy,us-gaap:RetainedEarningsNANANA40.27NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-61.489-0.946NANA237.425-574.315-3628.571NA-19.067-5.687-68.925203.962121.42.1215.012-798.278-286.432-65.981-86.957-173.261-693.052-301.041-171.748-98.689-1865.108-149.274-106.111-353.681157.975151.444109.069-59.265204.101134.95686.26381.70383.134150.88298.4762.889206.235203.14919.414NANANANA
us-gaap:ShareBasedCompensation █▁2.4552.309NANANA1.3332.0682.635-3.5313.9664.6512.4264.1471.5334.5632.596.2986.8225.9316.1356.4826.4866.5447.3127.3056.8266.6556.1816.0314.3146.7325.6065.1984.9046.7284.6924.684.5754.2433.4233.4593.4633.1642.2862.1952.1462.244
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄▅█-60.106-36.85-27.493-8.614NA-76.255-120.181-162.398-148.804-227.178-195.467-235.622-315.132-224.853-177.447-204.203238.586-204.126243.14NANANANANANANANANANANANANANANANANANANA-213.052-493.156-420.267-445.357-401.256-346.496-277.942-165.631-124.505
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▂▇█-131.191-117.606-41.603-25.498NA-1.192640.589-63.9853.132-1.25835.043-49.92548.95-99.462-904.284785.707-350.099.947-380.006NANANANANANANANANANANANANANANANANANANA-145.926174.55139.7377.257173.27585.215-14.502-75.487-70.949
  2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument wll:ConvertibleSeniorNotes1.25PercentDueTwoThousandTwentyNANANANA1.25e-061.2500000000000001e-081.2500000000000001e-081.2500000000000001e-081.2500000000000001e-081.2500000000000001e-081.2500000000000001e-081.2500000000000001e-081.2500000000000001e-08NANANANANANANANANANANANANA1.2500000000000001e-08NANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument wll:SeniorNotes5.75PercentDueTwoThousandTwentyOneNANANANA5.75e-065.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-085.7500000000000005e-08NANANANANANANANANANANANANANANANANANANA5.7500000000000005e-08NANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument wll:SeniorNotes6.25PercentDueTwoThousandTwentyThreeNANANANA6.25e-066.25e-086.25e-086.25e-086.25e-086.25e-086.25e-086.25e-086.25e-08NANANANANANANANANANANANANA6.25e-08NANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument wll:SeniorNotes6.625PercentDueTwoThousandTwentySixNANANANA6.625e-066.625e-086.625e-086.625e-086.625e-086.625e-086.625e-086.625e-086.625e-08NANA6.625e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value39000.039000.038000.038000.038000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.091750.072500.063000.052500.051500.051500.051500.051000.042000.030250.030000.030250.030000.030000.030000.029750.029750.029750.029750.029750.029500.029500.029500.029500.014750.012750.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStockValue us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:PredecessorAdjustment


Common
Period End2020-08-31
Value92000.0
Percentage of CommonStockValue100.0
Percentage of Assets0.0
Percentage of Assets wll:PredecessorAdjustment0.0

wll:SuccessorAdjustment


Common
Period End2020-09-01
Value38000.0
Percentage of CommonStockValue100.0
Percentage of Assets0.0
Percentage of Assets wll:SuccessorAdjustment0.0

us-gaap:CommonStockValue us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:PredecessorAdjustment


Common
Period End2020-09-01
Value-92000.0
Percentage of CommonStockValue-242.1
Percentage of Assets-0.0
Percentage of Assets wll:ReorganizationAdjustments wll:PredecessorAdjustment0.0

wll:ReorganizationAdjustments, wll:SuccessorAdjustment


Common
Period End2020-09-01
Value38000.0
Percentage of CommonStockValue100.0
Percentage of Assets0.0
Percentage of Assets wll:ReorganizationAdjustments wll:SuccessorAdjustment0.0

Shares Issued

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

us-gaap:SharesIssued

wll:SuccessorBankruptcy, us-gaap:CommonStock


Shares
Period End2020-09-30
Value38
Percentage of SharesIssued100.0

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:CommonStock


Shares
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value39393891919191919192929292923683683683672892512092062062062041681201201201201201201191181181181181181181181181171171021021028584
Percentage of SharesIssued0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-08-312020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value393838919191919191919191909090705651515142303029292929292929292929262929
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-08-312020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value393838919191919191909090909090705651515142292929292929292929292929262525
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted


Weighted
Period End2021-06-302020-06-30
Value3991
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.57-0.02-0.031.062.6-6.28-39.7-1.61-0.21-0.06-0.762.251.330.020.17-8.81-3.16-0.72-0.96-1.6-9.88-5.32-3.36-1.92-36.56-2.92-2.52-10.765.325.083.68-2.06.884.562.922.762.85.123.362.167.06.920.642.240.244.723.2
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.57-0.02-0.031.062.6-6.28-39.7-1.61-0.21-0.06-0.762.221.320.020.16-8.81-3.16-0.72-0.96-1.6-9.88-5.32-3.36-1.92-36.56-2.92-2.52-10.725.285.043.64-2.06.844.562.882.762.85.083.322.126.966.840.642.240.244.242.92
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-03-312014-03-312013-03-312012-03-31
Value2.02.01.01.02.0-5.04.06.00.07.05.07.03.06.07.06.06.06.06.07.07.06.76.74.2
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.71.10.40.0-1.30.91.50.01.20.91.40.01.92.21.60.04.61.82.41.30.91.10.7

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

wll:RestrictedStockAndRestrictedStockUnits


Allocated
Period End2020-08-312020-06-302019-09-302019-06-30
Value1.01.0-5.04.0
Percentage of AllocatedShareBasedCompensationExpense0.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.81.1-1.30.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax wll:RestrictedStockAndRestrictedStockUnits0.00.00.00.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value409305207301886083854412351360435220397476416138880536844836846475052857029688166891240561584554799525455475447397260406400155163399308279175211
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax116.499.50.050.5153.8664.61574.10.093.484.5111.80.070.190.580.90.0248.4118.2120.90.0359.6221.0181.10.0584.2138.4130.20.069.169.975.00.063.368.777.50.074.952.072.10.031.834.092.50.074.746.460.3

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1110111016284735293234283131313130313034333344384444437237353229502928232525342223201816191513
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.43.30.016.913.530.719.30.08.07.69.00.05.66.06.10.09.310.38.20.026.29.915.30.08.87.68.30.04.64.34.40.06.14.44.70.04.75.06.10.04.74.34.30.05.24.13.9

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-61.489-0.946-1.0528182-575.343-3628.571-73.894-19.06717-93.782051212.1215-961.256-528.73-104.208-126.447-443.312-335.504-411.03-236.924-146.911-2459.965-226.69-159.929-544.288251251185-79.15130520713713013324115798332317
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-17.5-0.30.046.0148.6-628.1-1482.00.0-5.14.2-24.10.021.40.42.90.0-163.1-33.5-34.10.0-259.6-121.0-81.10.0-484.2-38.4-30.20.030.930.125.00.036.731.322.50.025.148.027.90.068.266.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.147-12.185-55.346-1.0280.0730.023-24.8551.3730.00.00.0-162.978-242.298-38.227-39.476-270.047357-109.984-65.166-48.184-594.847-77.395-53.801-190.595939976-19.875101735148509058351261141238357752
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.00.0100.00.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-19.9-45.2-1.10.00.00.05.5-6.40.00.00.00.00.0-74.7-12.3-10.60.0276.7-32.4-22.30.0-117.1-13.1-10.20.011.512.010.30.012.211.08.40.09.418.010.50.025.923.83.00.09.620.415.1

us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementGeographical

country:CA


Income
Period End2020-12-312020-09-302020-08-31
Value3.0-15.0-55.0
Percentage of IncomeTaxExpenseBenefit2040.8123.199.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-24.6-44.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:CA0.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet us-gaap:StatementGeographical

us-gaap:IncomeTaxesPaidNet

country:CA


Income
Period End2020-12-31
Value6000000.0
Percentage of IncomeTaxesPaidNet100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:CA0.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.9815.1035.9522.128111645454848484748485247474748312847881868489744939394243242321201817181616151413141515
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.70.03.59.317.918.50.012.911.412.30.08.59.210.30.014.715.412.90.065.523.228.00.016.615.114.00.04.94.75.70.03.03.53.50.03.53.63.30.03.33.23.30.03.94.14.5

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2020-12-312020-09-302019-12-312019-09-30
Value6.0210.3017.19577
Percentage of InterestPaidNet100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.50.020.6

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-0.946-1.19740237-574.315-3628.571-147.487-19.067-5.687-68.925-798.278-286.432-65.981-86.957-173.261-693.052-301.041-171.748-98.689-1865.108-149.274-106.111-353.681157151109-59.2652041358681831509862206203
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.30.065.9193.7-627.0-1482.00.0-5.1-1.3-17.70.0-88.4-21.2-23.40.0-536.3-88.7-58.80.0-367.1-25.3-20.00.019.418.114.70.024.620.314.10.015.730.017.50.042.342.2

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-57.7851.6374.77230-65.913-517.181-3609.2-31.8532465-45.9972521694998-914.155-480.954-56.714-77.506-130.983-297.582-153.61-246.031-60.9661812825177326370311280316269252235204201263243233255214204172174157
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.40.50.049.5-53.8-564.6-1474.10.06.615.5-11.80.029.99.519.10.0-148.4-18.2-20.90.0-230.3-45.2-84.30.03.621.74.80.040.144.342.00.038.140.641.20.038.540.246.70.047.953.149.70.046.146.344.7

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value277000.02520000.0130000.06000.0139000.076000.0-4000.0500000.0144000.0642000.0316000.0698000.0363000.01489000.0880000.0346000.0-83000.0443000.0610000.0146000.0115000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.80.00.00.10.1-0.00.00.00.20.10.00.10.30.20.0-0.00.10.20.00.1

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-61.489-0.946-1.19740237-574.315-3628.571-147.487-19.067-5.687-68.9252031212.1215-798.278-286.432-65.981-86.971-173.265-693.055-301.046-171.758-98.727-1865.118-149.295-106.128-353.693157151109-59.276204134868183150986220620319
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-17.5-0.30.065.9193.7-627.0-1482.00.0-5.1-1.3-17.70.021.40.42.90.0-88.4-21.2-23.40.0-536.3-88.7-58.80.0-367.1-25.3-20.10.019.418.114.70.024.620.314.10.015.730.017.50.042.342.24.5

us-gaap:ProfitLoss dei:LegalEntity

wll:SuccessorBankruptcy


Profit
Period End2020-09-30
Value40
Percentage of ProfitLoss100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax65.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax wll:SuccessorBankruptcy0.0

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

wll:SuccessorBankruptcy, us-gaap:RetainedEarnings


Profit
Period End2020-09-30
Value40
Percentage of ProfitLoss100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax65.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax wll:SuccessorBankruptcy us-gaap:RetainedEarnings0.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-08-312020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-61.489-0.946237-574.315-3628.571-19.067-5.687-68.9252031212.1215-798.278-286.432-65.981-86.957-173.261-693.052-301.041-171.748-98.689-1865.108-149.274-106.111-353.681157151109-59.265204134868183150986220620319
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-17.5-0.3193.7-627.0-1482.0-5.1-1.3-17.70.021.40.42.90.0-88.4-21.2-23.40.0-536.3-88.7-58.80.0-367.1-25.3-20.00.019.418.114.70.024.620.314.10.015.730.017.50.042.342.24.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3513072126112291244380375426389473566526515474324311371524129339292423508590529696813835740720830663613577530502563498487481432413373377351
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

us-gaap:NaturalGasProduction


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-31
Value4147180.6925.587-0.30412215.9512230715461
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.815.68.81.14.6-0.35.35.71.65.37.715.19.711.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.815.68.81.14.6-0.35.35.71.65.37.715.19.711.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NaturalGasProduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OilAndCondensate


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-31
Value3082561936011691231358369403359401511453
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax87.783.591.298.995.4100.394.794.398.494.792.384.990.388.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax87.783.591.298.995.4100.394.794.398.494.792.384.990.388.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OilAndCondensate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OilAndGasExplorationAndProduction


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value34930491244
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax99.599.1100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax99.599.1100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OilAndGasExplorationAndProduction100.0100.0100.0100.0

us-gaap:OilAndGasPurchased


Revenue
Period End2021-06-302021-03-31
Value1.6632.712
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OilAndGasPurchased100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3513072126112291244380375426389473566526515474324311371524129339292423508590529696813835740720830663613577530502563498487481432413373377351
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value210820962043209821423730373245267636777477757751775977097561753284038502940593879876100651080511181113891167214213144521401996179358898188339126811776427272692965106219604556475286497846484029
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Assetsus-gaap:
Period End2020-09-01
Value-1062.251
Percentage of Assets-49.6
Percentage of Assets-49.6
Percentage of Assets wll:FreshStartAccountingAdjustments100.0

wll:ReorganizationAdjustments


Assetsus-gaap:
Period End2020-09-01
Value-525.39
Percentage of Assets-24.5
Percentage of Assets-24.5
Percentage of Assets wll:ReorganizationAdjustments100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value93886881586895339993910413136113604357535493489364536223597448337864409432447265461604065886630682275067662831653555261504049965236443741013819356232303094301626832531242721171759
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets44.541.439.941.444.5107.2104.891.347.346.446.045.845.047.347.947.853.444.546.946.147.954.355.958.958.258.452.853.059.355.756.256.156.657.454.753.752.551.449.649.849.947.547.948.845.543.7

us-gaap:Liabilities us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Liabilitiesus-gaap:
Period End2020-09-01
Value-91.855
Percentage of Liabilities-9.6
Percentage of Assets-4.3
Percentage of Assets wll:FreshStartAccountingAdjustments8.6

wll:ReorganizationAdjustments


Liabilitiesus-gaap:
Period End2020-09-01
Value-2954.56
Percentage of Liabilities-309.9
Percentage of Assets-137.9
Percentage of Assets wll:ReorganizationAdjustments562.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value210820962043209821423730373245267636777477757751775977097561753284038502940593879876100651080511181113891167214213144521401996179358898188339126811776427272692965106219604556475286497846484029
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Liabilities
Period End2020-09-01
Value-1062.251
Percentage of LiabilitiesAndStockholdersEquity-49.6
Percentage of Assets-49.6
Percentage of Assets wll:FreshStartAccountingAdjustments100.0

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value-525.39
Percentage of LiabilitiesAndStockholdersEquity-24.5
Percentage of Assets-24.5
Percentage of Assets wll:ReorganizationAdjustments100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value11691228122812291189-269.558-178.2793944024416942004202427040633939393539194715499650555141459647564584475048416699678156944254408939333828388136723532344433583271311630202955274725422531227018081490
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets55.558.660.158.655.5-7.2-4.88.752.753.654.054.255.052.752.152.246.655.553.153.952.145.744.041.041.741.547.146.940.644.243.743.843.342.545.246.247.448.550.350.150.052.352.051.154.556.30.00.0

us-gaap:StockholdersEquity us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Stockholders
Period End2020-09-01
Value-970.396
Percentage of StockholdersEquity-81.6
Percentage of Assets-45.3
Percentage of Assets wll:FreshStartAccountingAdjustments91.4

wll:ReorganizationAdjustments


Stockholders
Period End2020-09-01
Value2429
Percentage of StockholdersEquity204.3
Percentage of Assets113.4
Percentage of Assets wll:ReorganizationAdjustments-462.4

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value24824519017720773171310273303553433053983523423281189269291244622286319419535558597762842511733822106914001096366384392323328298268243270233176
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.811.79.38.59.719.619.122.74.34.64.43.95.14.64.54.414.23.23.12.66.32.83.03.84.74.84.25.36.05.37.89.212.115.313.54.85.35.75.05.34.94.84.65.45.04.4

us-gaap:AssetsCurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Assets
Period End2020-09-01
Value2.341
Percentage of AssetsCurrent1.1
Percentage of Assets0.1
Percentage of Assets wll:FreshStartAccountingAdjustments-0.2

wll:ReorganizationAdjustments


Assets
Period End2020-09-01
Value-526.671
Percentage of AssetsCurrent-253.7
Percentage of Assets-24.6
Percentage of Assets wll:ReorganizationAdjustments100.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value16242513225474925668.6526.681.692131416308791123165518151.06116376010578282274066991025238.18244266.8079.825156.088115.026183.2111513119.62414
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.81.21.30.71.114.713.212.50.10.10.00.20.20.20.410.50.10.20.20.60.20.10.00.10.30.40.70.60.32.44.57.911.20.30.10.60.40.10.20.30.10.20.10.40.00.00.00.30.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:StatementScenario

wll:ReorganizationAdjustments


Cash
Period End2020-09-01
Value-524.697
Percentage of CashAndCashEquivalentsAtCarryingValue-2315.8
Percentage of Assets-24.5
Percentage of Assets wll:ReorganizationAdjustments99.9

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value19272826495185668.6526.681.6921314163087911237316
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.91.31.41.31.313.912.50.10.10.00.20.20.20.410.50.10.20.70.1

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value214203142128136136165245308294292278294315287270284225210184173216233261332354454505543453464378341361345331318345293293262230211244199152
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.29.77.06.16.43.74.45.44.03.83.83.63.84.13.83.63.42.62.22.01.82.12.22.32.93.03.23.53.94.75.04.23.94.04.34.34.45.04.54.74.34.14.04.94.33.8

us-gaap:AccountsReceivableNetCurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Accounts
Period End2020-09-01
Value0.081
Percentage of AccountsReceivableNetCurrent0.1
Percentage of Assets0.0
Percentage of Assets wll:FreshStartAccountingAdjustments-0.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value141519222118283513151719222238272632304226172128273950418630413828132626212120
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.91.11.00.50.80.80.20.20.20.30.30.30.50.40.30.40.30.50.30.20.20.30.20.30.40.30.60.30.40.40.30.20.30.30.30.30.3

us-gaap:PrepaidExpenseAndOtherAssetsCurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Prepaid
Period End2020-09-01
Value2.26
Percentage of PrepaidExpenseAndOtherAssetsCurrent10.7
Percentage of Assets0.1
Percentage of Assets wll:FreshStartAccountingAdjustments-0.2

wll:ReorganizationAdjustments


Prepaid
Period End2020-09-01
Value0.231
Percentage of PrepaidExpenseAndOtherAssetsCurrent1.1
Percentage of Assets0.0
Percentage of Assets wll:ReorganizationAdjustments-0.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value19391886190218975044499462021299012894127871256512329121291180511608114281293113740135271336513856143391429314072139601599015975152261242111655108671027110473957299189353883683037856772772316797636059865072
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets92.592.390.788.6135.2133.8137.0170.1165.8164.4162.1158.9157.3156.1154.1136.0152.1146.1144.1135.3137.7132.7127.8123.6119.6112.5110.5108.6129.2124.5121.0116.3114.8117.9129.8128.6127.5127.5126.3127.8128.1128.6127.8128.8125.9

us-gaap:PropertyPlantAndEquipmentGross us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Property
Period End2020-09-01
Value-3146.541
Percentage of PropertyPlantAndEquipmentGross-165.8
Percentage of Assets-146.8
Percentage of Assets wll:FreshStartAccountingAdjustments296.2

wll:ReorganizationAdjustments


Property
Period End2020-09-01
Value-0.909
Percentage of PropertyPlantAndEquipmentGross-0.0
Percentage of Assets-0.0
Percentage of Assets wll:ReorganizationAdjustments0.2

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value12673192016276057355528539151905003480946204429424447344699448242224188392536253323301333883338308334313158288926762907269127882590241622382070208819611845173716301274
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.03.60.954.061.075.171.169.367.064.562.461.158.850.555.750.047.842.841.636.332.429.225.823.823.122.035.733.832.230.331.933.236.535.634.934.433.334.534.734.934.935.131.6

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1813181218821897295929773441725573657395737473267320718471787183819790419045914396681041410668107491094612601126361214289898496797775957566688171306763641960645785563852704951462343553798
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets86.588.789.788.679.379.876.095.094.795.195.194.495.095.095.385.596.496.196.492.696.196.495.494.493.888.787.486.693.590.888.886.082.984.893.393.092.693.293.093.393.393.792.993.794.3

us-gaap:PropertyPlantAndEquipmentNet us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Property
Period End2020-09-01
Value-1061.275
Percentage of PropertyPlantAndEquipmentNet-55.9
Percentage of Assets-49.5
Percentage of Assets wll:FreshStartAccountingAdjustments99.9

wll:ReorganizationAdjustments


Property
Period End2020-09-01
Value-0.909
Percentage of PropertyPlantAndEquipmentNet-0.0
Percentage of Assets-0.0
Percentage of Assets wll:ReorganizationAdjustments0.2

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-31
Value2026
Percentage of OperatingLeaseRightOfUseAsset100.0100.0
Percentage of Assets1.00.4

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:CorporateOfficeLeaseAgreementModification


Operating
Period End2020-09-01
Value10.0
Percentage of OperatingLeaseRightOfUseAsset0.0
Percentage of Assets0.5
Percentage of Assets wll:ReorganizationAdjustments wll:CorporateOfficeLeaseAgreementModification0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value39384038243741575053364834363425293572981101107293104915991104698113612010811211895899273747658522530
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.91.82.01.81.21.01.11.30.70.70.50.60.40.50.50.30.40.40.81.11.11.10.70.80.90.80.40.60.70.70.91.51.41.21.41.61.31.31.41.21.21.41.11.10.60.8

us-gaap:OtherAssetsNoncurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Other
Period End2020-09-01
Value-3.317
Percentage of OtherAssetsNoncurrent-13.3
Percentage of Assets-0.2
Percentage of Assets wll:FreshStartAccountingAdjustments0.3

wll:ReorganizationAdjustments


Other
Period End2020-09-01
Value-8.76
Percentage of OtherAssetsNoncurrent-35.1
Percentage of Assets-0.4
Percentage of Assets wll:ReorganizationAdjustments1.7

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value611461321311345123411913878550806109452753662567356715534594684434783974274915997638028811208832941727777988928819636652543634567438484528459282
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.022.015.814.916.133.131.985.77.210.414.16.86.98.18.97.518.55.45.04.74.84.04.04.45.36.55.66.18.68.710.18.18.810.811.410.78.89.48.410.29.47.89.210.69.97.0

us-gaap:LiabilitiesCurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Liabilities
Period End2020-09-01
Value-6.656
Percentage of LiabilitiesCurrent-1.9
Percentage of Assets-0.3
Percentage of Assets wll:FreshStartAccountingAdjustments0.6

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value-881.686
Percentage of LiabilitiesCurrent-255.0
Percentage of Assets-41.1
Percentage of Assets wll:ReorganizationAdjustments167.8

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2020-08-312020-06-302020-03-312019-09-302019-06-302017-12-31
Value9129123423256542958
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets24.524.475.63.37.011.4

us-gaap:LongTermDebtCurrent us-gaap:StatementScenario

wll:ReorganizationAdjustments


Long
Period End2020-09-01
Value-912.259
Percentage of LongTermDebtCurrent0.0
Percentage of Assets-42.6
Percentage of Assets wll:ReorganizationAdjustments173.6

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-12-312019-12-31
Value4031000.07346000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0
Percentage of Assets0.20.1

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value222820141514186364130899673746476691079585564548799412518919842922621621015815810410911011210912114211296978429
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.41.00.70.70.40.51.40.81.71.11.20.91.00.91.00.81.31.00.90.60.50.40.70.81.11.31.43.12.42.32.31.81.71.31.41.51.61.72.02.42.01.82.01.80.7

us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:StatementScenario

wll:ReorganizationAdjustments


Other
Period End2020-09-01
Value1.305
Percentage of OtherAccruedLiabilitiesCurrent8.5
Percentage of Assets0.1
Percentage of Assets wll:ReorganizationAdjustments-0.2

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value35360.476636146485253656560331099876512324318160556050142148171169109219109214200149143180175146169157133115113153110
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.70.03.02.91.21.31.20.70.80.80.80.41.41.31.00.60.30.30.30.80.60.50.50.41.21.01.21.21.12.31.22.42.21.81.92.52.52.22.72.62.42.22.33.32.7

us-gaap:OtherLiabilitiesCurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Other
Period End2020-09-01
Value-6.529
Percentage of OtherLiabilitiesCurrent-10.6
Percentage of Assets-0.3
Percentage of Assets wll:FreshStartAccountingAdjustments0.6

wll:ReorganizationAdjustments


Other
Period End2020-09-01
Value21
Percentage of OtherLiabilitiesCurrent35.5
Percentage of Assets1.0
Percentage of Assets wll:ReorganizationAdjustments-4.2

us-gaap:OtherLiabilitiesCurrent us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:OtherExpensesAccrued


Other
Period End2020-09-01
Value3.315
Percentage of OtherLiabilitiesCurrent5.4
Percentage of Assets0.2
Percentage of Assets wll:ReorganizationAdjustments wll:OtherExpensesAccrued0.0

wll:ReorganizationAdjustments, wll:PaymentOfProfessionalFees


Other
Period End2020-09-01
Value-6.834
Percentage of OtherLiabilitiesCurrent-11.1
Percentage of Assets-0.3
Percentage of Assets wll:ReorganizationAdjustments wll:PaymentOfProfessionalFees0.0

wll:ReorganizationAdjustments, wll:ReinstatementOfAccruedExpensesFromLiabilitiesSubjectToCompromise


Other
Period End2020-09-01
Value13
Percentage of OtherLiabilitiesCurrent22.6
Percentage of Assets0.7
Percentage of Assets wll:ReorganizationAdjustments wll:ReinstatementOfAccruedExpensesFromLiabilitiesSubjectToCompromise0.0

wll:ReorganizationAdjustments, wll:SuccessFeePayable


Other
Period End2020-09-01
Value11
Percentage of OtherLiabilitiesCurrent18.6
Percentage of Assets0.5
Percentage of Assets wll:ReorganizationAdjustments wll:SuccessFeePayable0.0

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value16161116131312132622282831383329282320303945474147636554637169555061443933423536313431263021
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.80.60.80.70.40.30.30.40.30.40.40.40.50.40.40.30.30.20.30.40.50.40.40.40.50.50.40.50.70.70.60.60.70.60.50.50.60.50.60.50.60.60.50.70.5

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value11524536040042527992605230328392792283527782861276429313274316835354085496053345197525452455236562827532653265326532653200018501800160014201240138012001060980800779
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.511.717.619.119.836.733.529.636.636.036.836.738.032.934.534.833.735.840.645.947.745.645.036.936.240.128.628.429.530.029.124.624.224.823.121.819.922.821.220.019.717.219.3

us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument

wll:CreditAgreement


Long
Period End2021-06-302021-03-312020-12-31
Value115245360
Percentage of LongTermDebtNoncurrent100.0100.0100.0
Percentage of Assets5.511.717.6
Percentage of Assets wll:CreditAgreement0.00.00.0

us-gaap:LongTermDebtNoncurrent us-gaap:StatementScenario

wll:ReorganizationAdjustments


Long
Period End2020-09-01
Value425
Percentage of LongTermDebtNoncurrent100.0
Percentage of Assets19.8
Percentage of Assets wll:ReorganizationAdjustments-81.0

Deferred Finance Costs Noncurrent Net

us-gaap:DeferredFinanceCostsNoncurrentNet

us-gaap:DeferredFinanceCostsNoncurrentNet


Deferred
Period End2020-09-012020-08-31
Value121.834
Percentage of DeferredFinanceCostsNoncurrentNet100.0100.0
Percentage of Assets0.60.0

us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:StatementScenario

wll:ReorganizationAdjustments


Deferred
Period End2020-09-01
Value10
Percentage of DeferredFinanceCostsNoncurrentNet85.7
Percentage of Assets0.5
Percentage of Assets wll:ReorganizationAdjustments-2.1

us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:FinancingCostCreditAgreement


Deferred
Period End2020-09-01
Value-11.0
Percentage of DeferredFinanceCostsNoncurrentNet-86.0
Percentage of Assets-0.5
Percentage of Assets wll:ReorganizationAdjustments wll:FinancingCostCreditAgreement0.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2020-09-012020-08-312020-06-302020-03-312019-12-312018-12-31
Value14696969731.373
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0
Percentage of Assets0.71.91.91.51.00.0

us-gaap:DeferredIncomeTaxLiabilitiesNet us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Deferred
Period End2020-09-01
Value-55.346
Percentage of DeferredIncomeTaxLiabilitiesNet-381.7
Percentage of Assets-2.6
Percentage of Assets wll:FreshStartAccountingAdjustments5.2

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1245231928187.745202427293227363436367693653336393634274021204.3264.34.3654.21226262525272626252625242323
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.62.21.20.91.30.50.20.50.30.40.40.40.30.50.50.50.40.91.00.70.30.40.40.30.30.20.30.10.10.00.00.00.00.30.30.30.40.40.40.40.40.50.50.50.50.6

us-gaap:OtherLiabilitiesNoncurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Other
Period End2020-09-01
Value-0.458
Percentage of OtherLiabilitiesNoncurrent-1.6
Percentage of Assets-0.0
Percentage of Assets wll:FreshStartAccountingAdjustments0.0

wll:ReorganizationAdjustments


Other
Period End2020-09-01
Value11
Percentage of OtherLiabilitiesNoncurrent38.5
Percentage of Assets0.5
Percentage of Assets wll:ReorganizationAdjustments-2.1

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-03-312019-12-312019-09-302019-06-302019-03-31
Value16161717173031331313
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.80.90.80.80.70.40.40.20.2

us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Operating
Period End2020-09-01
Value0.187
Percentage of OperatingLeaseLiabilityNoncurrent1.0
Percentage of Assets0.0
Percentage of Assets wll:FreshStartAccountingAdjustments-0.0

wll:ReorganizationAdjustments


Operating
Period End2020-09-01
Value17
Percentage of OperatingLeaseLiabilityNoncurrent99.0
Percentage of Assets0.8
Percentage of Assets wll:ReorganizationAdjustments-3.4

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value3572000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value3255000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value2898000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value1903000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value9349000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.5

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2139411921
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets1.00.50.50.20.3

us-gaap:OperatingLeaseLiability us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:CorporateOfficeLeaseAgreementModification


Operating
Period End2020-09-01
Value15
Percentage of OperatingLeaseLiability0.0
Percentage of Assets0.7
Percentage of Assets wll:ReorganizationAdjustments wll:CorporateOfficeLeaseAgreementModification0.0

wll:ReorganizationAdjustments, wll:OperatingLeaseObligationsReinstated


Operating
Period End2020-09-01
Value18
Percentage of OperatingLeaseLiability0.0
Percentage of Assets0.8
Percentage of Assets wll:ReorganizationAdjustments wll:OperatingLeaseObligationsReinstated0.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value25
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets1.2

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value4031000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.2

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value11691228122812291189-269.558-178.2793944024416942004202427040633939393539194715499650555141459647564584475048416699678156944254408939333828388136723532344433583271311630202955274725422531227018081490
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets55.558.660.158.655.5-7.2-4.88.752.753.654.054.255.052.752.152.246.655.553.153.952.145.744.041.041.741.547.146.940.644.243.743.843.342.545.246.247.448.550.350.150.052.352.051.154.556.30.00.0

us-gaap:StockholdersEquity us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Stockholders
Period End2020-09-01
Value-970.396
Percentage of StockholdersEquity-81.6
Percentage of Assets-45.3
Percentage of Assets wll:FreshStartAccountingAdjustments91.4

wll:ReorganizationAdjustments


Stockholders
Period End2020-09-01
Value2429
Percentage of StockholdersEquity204.3
Percentage of Assets113.4
Percentage of Assets wll:ReorganizationAdjustments-462.4

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value116912281228-178.279394402441694200420242704063393939353919471549965063514946044764459247584850670767895703426240973941383638903680354034533367327931253029296427552551253124652460234322701808
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets55.558.660.1-4.88.752.753.654.054.255.052.752.152.246.655.553.153.952.145.744.141.141.841.647.247.040.744.343.843.943.442.645.346.347.548.650.450.250.152.552.151.254.50.00.00.056.30.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity

wll:SuccessorBankruptcy


Stockholders
Period End2020-09-30
Value1229
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.0
Percentage of Assets58.6
Percentage of Assets wll:SuccessorBankruptcy0.0

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

wll:SuccessorBankruptcy, us-gaap:AdditionalPaidInCapital


Stockholders
Period End2020-09-30
Value1189
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.0
Percentage of Assets56.7
Percentage of Assets wll:SuccessorBankruptcy us-gaap:AdditionalPaidInCapital0.0

wll:SuccessorBankruptcy, us-gaap:CommonStock


Stockholders
Period End2020-09-30
Value0.038
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.0
Percentage of Assets0.0
Percentage of Assets wll:SuccessorBankruptcy us-gaap:CommonStock0.0

wll:SuccessorBankruptcy, us-gaap:RetainedEarnings


Stockholders
Period End2020-09-30
Value40
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.0
Percentage of Assets1.9
Percentage of Assets wll:SuccessorBankruptcy us-gaap:RetainedEarnings0.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value1193119011896409640864096407641964156414641164086406640564036397639063895671513846654659465246454577338515901583157915831578157215681566156215571552155415501547154315491547154515431546971
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest102.096.996.8-3595.31623.6159.3153.7152.8152.7150.2157.8162.7162.8163.4135.8128.0126.2124.1123.2107.8101.697.995.969.367.459.437.338.640.141.340.642.744.345.446.447.549.751.352.356.160.561.262.862.865.868.153.7
Percentage of Assets56.656.858.2171.7141.683.982.482.682.882.783.284.885.176.275.368.068.164.756.347.641.740.939.932.731.724.116.516.917.617.917.319.420.521.522.523.925.025.727.529.331.033.30.00.00.038.40.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value0.0390.0390.0380.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.0920.3680.3680.3680.3670.290.2520.210.2060.2060.2060.2040.1680.1210.120.1210.120.120.120.1190.1190.1190.1190.1190.1180.1180.1180.1180.0590.0590.0510.0510.0510.043
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.0-0.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value-23.3623839-6587.998-6013.683-2385.112-2237.625-2218.558-2212.871-2143.946-2347.908-2469.308-2471.428-2486.44-1688.162-1401.73-1335.749-1248.572-1075.311-382.259-81.2189018920542203230926632505235322442304210019651879179717151564146614031197994975909904784702820
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-2.03.13.23695.3-1523.6-59.3-53.7-52.8-52.7-50.2-57.8-62.7-62.8-63.4-35.8-28.1-26.4-24.2-23.4-8.0-1.81.93.930.632.540.562.561.259.758.559.257.155.554.453.452.350.148.447.443.439.038.536.936.733.531.045.3
Percentage of Assets-1.11.81.9-176.5-132.9-31.2-28.8-28.5-28.5-27.6-30.5-32.7-32.8-29.6-19.9-14.9-14.2-12.6-10.7-3.5-0.70.81.614.515.216.527.726.826.225.425.225.925.725.825.926.325.224.324.922.620.021.00.00.00.017.40.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value39000.039000.038000.038000.038000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.092000.091750.072500.063000.052500.051500.051500.051500.051000.042000.030250.030000.030250.030000.030000.030000.029750.029750.029750.029750.029750.029500.029500.029500.029500.014750.012750.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStockValue us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:PredecessorAdjustment


Common
Period End2020-08-31
Value92000.0
Percentage of CommonStockValue100.0
Percentage of Assets0.0
Percentage of Assets wll:PredecessorAdjustment0.0

wll:SuccessorAdjustment


Common
Period End2020-09-01
Value38000.0
Percentage of CommonStockValue100.0
Percentage of Assets0.0
Percentage of Assets wll:SuccessorAdjustment0.0

us-gaap:CommonStockValue us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:PredecessorAdjustment


Common
Period End2020-09-01
Value-92000.0
Percentage of CommonStockValue-242.1
Percentage of Assets-0.0
Percentage of Assets wll:ReorganizationAdjustments wll:PredecessorAdjustment0.0

wll:ReorganizationAdjustments, wll:SuccessorAdjustment


Common
Period End2020-09-01
Value38000.0
Percentage of CommonStockValue100.0
Percentage of Assets0.0
Percentage of Assets wll:ReorganizationAdjustments wll:SuccessorAdjustment0.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1193119011891189118964106409640864096407641964156414641164086406640564036397639063895671513846654659465246454577338515901583157915831578157215681566156215571552155415501547154315491546
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets56.656.858.256.755.5171.8171.7141.683.982.482.682.882.783.284.885.176.275.368.068.164.756.347.641.740.939.932.731.724.116.516.917.617.917.319.420.521.522.523.925.025.727.529.331.033.338.4

us-gaap:AdditionalPaidInCapital us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:PredecessorAdjustment


Additional
Period End2020-08-31
Value6410
Percentage of AdditionalPaidInCapital100.0
Percentage of Assets171.8
Percentage of Assets wll:PredecessorAdjustment0.0

wll:SuccessorAdjustment


Additional
Period End2020-09-01
Value1189
Percentage of AdditionalPaidInCapital100.0
Percentage of Assets55.5
Percentage of Assets wll:SuccessorAdjustment0.0

us-gaap:AdditionalPaidInCapital us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:PredecessorAdjustment


Additional
Period End2020-09-01
Value-6410.41
Percentage of AdditionalPaidInCapital-539.1
Percentage of Assets-299.2
Percentage of Assets wll:ReorganizationAdjustments wll:PredecessorAdjustment0.0

wll:ReorganizationAdjustments, wll:SuccessorAdjustment


Additional
Period End2020-09-01
Value1189
Percentage of AdditionalPaidInCapital100.0
Percentage of Assets55.5
Percentage of Assets wll:ReorganizationAdjustments wll:SuccessorAdjustment0.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-23.362383940-6680.06-6587.998-6013.683-2385.112-2237.625-2218.558-2212.871-2143.946-2347.908-2469.308-2471.428-2486.44-1688.162-1401.73-1335.749-1248.572-1075.311-382.259-81.2189018920542203230926632505235322442304210019651879179717151564146614031197994975702
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.11.81.91.9-179.1-176.5-132.9-31.2-28.8-28.5-28.5-27.6-30.5-32.7-32.8-29.6-19.9-14.9-14.2-12.6-10.7-3.5-0.70.81.614.515.216.527.726.826.225.425.225.925.725.825.926.325.224.324.922.720.021.017.4

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Retained
Period End2020-09-01
Value-970.396
Percentage of RetainedEarningsAccumulatedDeficit0.0
Percentage of Assets-45.3
Percentage of Assets wll:FreshStartAccountingAdjustments91.4

wll:ReorganizationAdjustments


Retained
Period End2020-09-01
Value7650
Percentage of RetainedEarningsAccumulatedDeficit0.0
Percentage of Assets357.0
Percentage of Assets wll:ReorganizationAdjustments-1456.1

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2020-09-012015-12-312015-09-302015-06-302015-03-31
Value11590.00.0601039
Percentage of StockIssuedDuringPeriodValueNewIssues100.00.00.0100.0100.0
Percentage of Assets0.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues dei:LegalEntity

wll:SuccessorBankruptcy


Stock
Period End2020-09-30
Value1159
Percentage of StockIssuedDuringPeriodValueNewIssues0.0
Percentage of Assets0.0
Percentage of Assets wll:SuccessorBankruptcy0.0

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

wll:SuccessorBankruptcy, us-gaap:AdditionalPaidInCapital


Stock
Period End2020-09-30
Value1159
Percentage of StockIssuedDuringPeriodValueNewIssues0.0
Percentage of Assets0.0
Percentage of Assets wll:SuccessorBankruptcy us-gaap:AdditionalPaidInCapital0.0

wll:SuccessorBankruptcy, us-gaap:CommonStock


Stock
Period End2020-09-30
Value0.038
Percentage of StockIssuedDuringPeriodValueNewIssues0.0
Percentage of Assets0.0
Percentage of Assets wll:SuccessorBankruptcy us-gaap:CommonStock0.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-03-312020-09-012015-12-312015-09-302015-06-302015-03-31
Value-0.00111590.00.0601039
Percentage of StockIssuedDuringPeriodValueNewIssues0.0100.00.00.0100.0100.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.0

us-gaap:CommonStock


Stock
Period End2021-03-312020-09-012015-12-312015-09-302015-06-302015-03-31
Value0.0010.0380.00.00.0020.035
Percentage of StockIssuedDuringPeriodValueNewIssues0.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:EquityIssuedToPredecessorAndHoldersOfUnvestedCashSettledEquityAwards


Stock
Period End2020-09-01
Value34
Percentage of StockIssuedDuringPeriodValueNewIssues3.0
Percentage of Assets0.0
Percentage of Assets wll:ReorganizationAdjustments wll:EquityIssuedToPredecessorAndHoldersOfUnvestedCashSettledEquityAwards0.0

wll:ReorganizationAdjustments, wll:EquityIssuedToUnsecuredClaimHolders


Stock
Period End2020-09-01
Value1125
Percentage of StockIssuedDuringPeriodValueNewIssues97.0
Percentage of Assets0.0
Percentage of Assets wll:ReorganizationAdjustments wll:EquityIssuedToUnsecuredClaimHolders0.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-08-312020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.4552.3090.7871.3332.068-3.5313.9654.6512.4264.1471.5334.5632.596.2986.8225.9316.1356.4826.4866.5447.3127.3056.8266.6556.1816.0314.3146.7325.6065.1984.9046.7284.6924.684.5754.2433.4233.4593.4633.1642.2862.1952.1462.244
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-08-312020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.4552.3090.7871.3332.068-3.533.9654.6512.4264.1471.5334.5632.596.2986.8225.9316.1356.4826.4866.5447.3127.3056.8266.6556.1816.0314.3146.7325.6065.1984.9046.7284.6924.684.5754.2433.4233.4593.4633.1642.2862.1952.1462.244
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value183153701130372351382331482842633102322869911080352328275374214277280243196
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.149.833.219.132.815.261.837.054.838.160.246.559.045.260.430.635.621.662.665.856.577.849.567.075.064.556.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-60.106-36.85-27.493-8.614-76.255-120.181-162.398-148.804-227.178-195.467-235.622-315.132-224.853-177.447-204.203238-204.126243-213.052-493.156-420.267-445.357-401.256-346.496-277.942-165.631-124.505
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-17.1-12.0-13.0-14.1-83.2-49.1-42.7-39.6-53.3-50.2-49.8-55.6-42.7-34.5-43.073.6-65.565.5-37.8-98.9-86.2-92.6-92.8-83.8-74.4-43.9-35.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-131.191-117.606-41.603-25.498-1.192640-63.9853.132-1.25835-49.92548-99.462-904.284785-350.099-380.006-145.9261741397717385-14.502-75.487-70.949
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-37.3-38.3-19.6-41.7-1.3261.6-16.80.8-0.39.0-10.58.6-18.9-175.6165.6-108.032.1-102.3-25.935.028.716.140.120.6-3.9-20.0-20.2

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-8.051-1.2631.432-22.472-47.3985578.652-6.684.988-11.915-0.58-2.426-13.902-848.864868
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.3-0.40.7-36.8-51.7227.72.3-1.81.2-3.1-0.1-0.4-2.6-164.8183.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0-14.501-55.3460.0-3.746730.023-24.855-162.054-239.137-36.911-37.586-262.742357-109.983-65.169-48.184-594.425-77.311-53.95-185.525949275-15.7393755149518957361251121040367151
Percentage of DeferredIncomeTaxExpenseBenefit0.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value515357207183183204211203198197197199187275212220240270284304312321316322283300285268235247219223201188179160156127122110107104979497
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value115814-7.752-90.271-62.289202.26313-11.775-21.3482818-13.40559132610-35.794-23.189-25.733-70.7-19.026-99.675-50.621-38.045-129.976-10.9398636-20.335151313-27.08751-0.191313119-32.0794417130.06216
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value183153701130372351382331482842633102322869911080352328275374214277280243196
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.149.833.219.132.815.261.837.054.838.160.246.559.045.260.430.635.621.662.665.856.577.849.567.075.064.556.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-61.489-0.946-1.19740237-574.315-3628.571-147.487-19.067-5.687-68.9252031212.1215-798.278-286.432-65.981-86.971-173.265-693.055-301.046-171.758-98.727-1865.118-149.295-106.128-353.693157151109-59.276204134868183150986220620319
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-17.5-0.3-0.665.9193.7-627.0-1482.0-38.8-5.1-1.3-17.743.121.40.42.9-168.3-88.4-21.2-23.4-33.1-536.3-88.7-58.8-23.3-367.1-25.3-20.1-50.819.418.114.7-8.224.620.314.114.215.730.017.512.642.342.24.5

us-gaap:ProfitLoss dei:LegalEntity

wll:SuccessorBankruptcy


Profit
Period End2020-09-30
Value40
Percentage of ProfitLoss100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax65.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax wll:SuccessorBankruptcy0.0

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

wll:SuccessorBankruptcy, us-gaap:RetainedEarnings


Profit
Period End2020-09-30
Value40
Percentage of ProfitLoss100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax65.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax wll:SuccessorBankruptcy us-gaap:RetainedEarnings0.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-08-312020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-61.489-0.946237-574.315-3628.571-19.067-5.687-68.9252031212.1215-798.278-286.432-65.981-86.957-173.261-693.052-301.041-171.748-98.689-1865.108-149.274-106.111-353.681157151109-59.265204134868183150986220620319
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-17.5-0.3193.7-627.0-1482.0-5.1-1.3-17.743.121.40.42.9-168.3-88.4-21.2-23.4-33.1-536.3-88.7-58.8-23.3-367.1-25.3-20.0-50.819.418.114.7-8.224.620.314.114.215.730.017.512.642.342.24.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.4552.3091.3332.0682.635-3.5313.9664.6512.4264.1471.5334.5632.596.2986.8225.9316.1356.4826.4866.5447.3127.3056.8266.6556.1816.0314.3146.7325.6065.1984.9046.7284.6924.684.5754.2433.4233.4593.4633.1642.2862.1952.1462.244
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-60.106-36.85-27.493-8.614-76.255-120.181-162.398-148.804-227.178-195.467-235.622-315.132-224.853-177.447-204.203238-204.126243-213.052-493.156-420.267-445.357-401.256-346.496-277.942-165.631-124.505
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-17.1-12.0-13.0-14.1-83.2-49.1-42.7-39.6-53.3-50.2-49.8-55.6-42.7-34.5-43.073.6-65.565.5-37.8-98.9-86.2-92.6-92.8-83.8-74.4-43.9-35.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-131.191-117.606-41.603-25.498-1.192640-63.9853.132-1.25835-49.92548-99.462-904.284785-350.099-380.006-145.9261741397717385-14.502-75.487-70.949
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-37.3-38.3-19.6-41.7-1.3261.6-16.80.8-0.39.0-10.58.6-18.9-175.6165.6-108.032.1-102.3-25.935.028.716.140.120.6-3.9-20.0-20.2

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

wll:ConvertibleSeniorNotes1.25PercentDueTwoThousandTwenty


Debt
Period End2020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302015-03-31
Value1.250.01250.01250.01250.01250.01250.01250.01250.01250.0125
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations wll:ConvertibleSeniorNotes1.25PercentDueTwoThousandTwenty0.00.00.00.00.00.00.00.00.00.0

wll:SeniorNotes5.75PercentDueTwoThousandTwentyOne


Debt
Period End2020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-09-30
Value5.750.05750.05750.05750.05750.05750.05750.05750.05750.0575
Percentage of DebtInstrumentInterestRateStatedPercentage460.0460.0460.0460.0460.0460.0460.0460.0460.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations wll:SeniorNotes5.75PercentDueTwoThousandTwentyOne0.00.00.00.00.00.00.00.00.00.0

wll:SeniorNotes6.25PercentDueTwoThousandTwentyThree


Debt
Period End2020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302015-03-31
Value6.250.06250.06250.06250.06250.06250.06250.06250.06250.0625
Percentage of DebtInstrumentInterestRateStatedPercentage500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations wll:SeniorNotes6.25PercentDueTwoThousandTwentyThree0.00.00.00.00.00.00.00.00.00.0

wll:SeniorNotes6.625PercentDueTwoThousandTwentySix


Debt
Period End2020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6.6250.066250.066250.066250.066250.066250.066250.066250.066250.06625
Percentage of DebtInstrumentInterestRateStatedPercentage530.0530.0530.0530.0530.0530.0530.0530.0530.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations wll:SeniorNotes6.625PercentDueTwoThousandTwentySix0.00.00.00.00.00.00.00.00.00.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities us-gaap:StatementGeographical

us-gaap:DeferredTaxLiabilities

country:CA


Deferred
Period End2020-09-30
Value6.0
Percentage of DeferredTaxLiabilities100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value158287786341058914702557647319280
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5851881522712645.0615.6381.231.231.231.23
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation


Adjustments
Period End2021-06-302021-03-312020-08-312020-03-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.0041.3570.0040.3040.0023.6930.680.960.03.1041.1430.00.0534.8850.1350.00.0350.6740.0150.00.0561.0550.3120.00.267110.0970.00.1145.40.00.00.0385.657-18.0980.0010.1048.9440.00.024
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-08-312020-03-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.0041.3570.0040.3040.0033.6930.680.960.03.1041.1430.00.0534.8850.1350.00.0350.6740.0150.00.0561.0550.3120.00.267110.0970.00.1145.40.00.00.0385.657-18.0980.0010.1048.9440.00.024
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0150.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued


Adjustments
Period End2020-09-01
Value29
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued dei:LegalEntity

wll:SuccessorBankruptcy


Adjustments
Period End2020-09-30
Value29
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued0.0

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

wll:SuccessorBankruptcy, us-gaap:AdditionalPaidInCapital


Adjustments
Period End2020-09-30
Value29
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued0.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2020-09-01
Value29
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:WarrantsIssuedToPredecessorHoldersAndHoldersOfUnvestedCashSettledEquityAwards


Adjustments
Period End2020-09-01
Value29
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued100.0

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AmortizationOfFinancingCostsAndDiscounts


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.8860.8870.8870.3715.254.5364.6337.9737.9167.8187.7247.6347.5377.8058.7887.7057.6177.6052633317211313171.9992.6412.0011.9825.364.6052.852.5152.4352.4672.362.3512.342.3252.1162.1142.1272.0672.8012.8582.866
Percentage of AmortizationOfFinancingCostsAndDiscounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetImpairmentCharges us-gaap:FairValueByAssetClass

us-gaap:AssetImpairmentCharges

wll:UnprovedProperties


Asset
Period End2021-06-302021-03-312020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.01.00.0830.132120.9372.2332.3083.0
Percentage of AssetImpairmentCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationAccretionExpense

us-gaap:AssetRetirementObligationAccretionExpense


Asset
Period End2021-06-302021-03-312020-12-312020-09-30
Value2.192.2222.8720.929
Percentage of AssetRetirementObligationAccretionExpense100.0100.0100.0100.0

us-gaap:AssetRetirementObligationLiabilitiesIncurred

us-gaap:AssetRetirementObligationLiabilitiesIncurred


Asset
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.5080.2650.00.02
Percentage of AssetRetirementObligationLiabilitiesIncurred100.0100.00.0100.0

us-gaap:AssetRetirementObligationLiabilitiesSettled

us-gaap:AssetRetirementObligationLiabilitiesSettled


Asset
Period End2021-06-302021-03-31
Value1.1831.309
Percentage of AssetRetirementObligationLiabilitiesSettled100.0100.0

us-gaap:AssetRetirementObligationRevisionOfEstimate

us-gaap:AssetRetirementObligationRevisionOfEstimate


Asset
Period End2021-06-302021-03-31
Value1.5336.821
Percentage of AssetRetirementObligationRevisionOfEstimate100.0100.0

us-gaap:BankruptcyClaimsAmountOfClaimsFiled us-gaap:CounterpartyName

us-gaap:BankruptcyClaimsAmountOfClaimsFiled

wll:ArguelloAndFreeportMcmoranOilGas


Bankruptcy
Period End2020-10-01
Value60
Percentage of BankruptcyClaimsAmountOfClaimsFiled100.0

wll:UsGovernment


Bankruptcy
Period End2020-10-01
Value25
Percentage of BankruptcyClaimsAmountOfClaimsFiled41.7

us-gaap:BankruptcyClaimsAmountOfClaimsFiled us-gaap:CounterpartyName, us-gaap:Range

wll:BnnWesternLlc, srt:Maximum


Bankruptcy
Period End2020-09-28
Value60
Percentage of BankruptcyClaimsAmountOfClaimsFiled0.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-7.18634-1.71423-49.9288-61.20725-1.7291231.4781.783-5.87292-66.32214251062.6364.021-20.96179-31.788-63.511-9.313198203105.943210-0.074490.432109-1.4742.502-12.3341213016-1.2699711171738
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CurrentIncomeTaxExpenseBenefit

us-gaap:CurrentIncomeTaxExpenseBenefit


Current
Period End2020-12-312020-09-302020-06-302020-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value147000.02316000.0-1028000.03746000.0-924000.0-3161000.0-1316000.0-1890000.0-7305000.0113000.0-1000.03000.00-422000.0-84000.0149000.0-5070000.0-660000.07355000.01000000.0-4145000.07220000.0-2511000.0422000.0-1345000.0-1859000.01109000.01426000.0-737000.0975000.01565000.02050000.0-1489000.0-170000.05308000.01330000.0
Percentage of CurrentIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:DebtInstrument, us-gaap:VariableRate

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

wll:ExitCreditAgreement, us-gaap:FederalFundsEffectiveSwapRate


Debt
Period End2020-09-01
Value0.5
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

wll:ExitCreditAgreement, us-gaap:LondonInterbankOfferedRateLIBOR


Debt
Period End2020-09-01
Value1.0
Percentage of DebtInstrumentBasisSpreadOnVariableRate1200.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:Range, us-gaap:DebtInstrument

srt:Maximum, wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value3.75
Percentage of DebtInstrumentBasisSpreadOnVariableRate1750.0

srt:Minimum, wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value2.75
Percentage of DebtInstrumentBasisSpreadOnVariableRate1550.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:Range, us-gaap:DebtInstrument, us-gaap:VariableRate

srt:Maximum, wll:ExitCreditAgreement, us-gaap:BaseRate


Debt
Period End2020-09-01
Value2.75
Percentage of DebtInstrumentBasisSpreadOnVariableRate1550.0

srt:Minimum, wll:ExitCreditAgreement, us-gaap:BaseRate


Debt
Period End2020-09-01
Value1.75
Percentage of DebtInstrumentBasisSpreadOnVariableRate1350.0

us-gaap:DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1

us-gaap:DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1


Debtor
Period End2020-08-31
Value1324
Percentage of DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1100.0

us-gaap:DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 us-gaap:StatementScenario

wll:ReorganizationAdjustments


Debtor
Period End2020-09-01
Value1324
Percentage of DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet10.0

us-gaap:DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:CorporateOfficeLeaseAgreementModification


Debtor
Period End2020-09-01
Value5.0
Percentage of DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet10.0

us-gaap:DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees

us-gaap:DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees


Debtor
Period End2020-08-31
Value30
Percentage of DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees100.0

us-gaap:DebtorReorganizationItemsOtherExpenseIncome

us-gaap:DebtorReorganizationItemsOtherExpenseIncome


Debtor
Period End2020-08-31
Value9464000.0
Percentage of DebtorReorganizationItemsOtherExpenseIncome100.0

us-gaap:DebtorReorganizationItemsOtherExpenseIncome us-gaap:StatementScenario

wll:ReorganizationAdjustments


Debtor
Period End2020-09-01
Value3407000.0
Percentage of DebtorReorganizationItemsOtherExpenseIncome0.0

us-gaap:DebtorReorganizationItemsRevaluationOfAssetsAndLiabilities

us-gaap:DebtorReorganizationItemsRevaluationOfAssetsAndLiabilities


Debtor
Period End2020-08-31
Value1025
Percentage of DebtorReorganizationItemsRevaluationOfAssetsAndLiabilities100.0

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DerivativeGainLossOnDerivativeNet


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-04-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-255.409-146.693-55.30830-43.125-6.63213231-46.3383024-62.905160-21.063-103.483-52.664-75.566-30.86720-36.577-27.845302.761-4.761102207-102.4199.85112723-26.076-24.53517-24.26930-31.25721-6.421
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-146.693-55.30830-43.125-6.632231-46.3383024-62.905160-21.063-103.483-52.664-75.566-30.86725-23.351-31.10822-66.71116102207-102.4199.85113529-17.304-10.187
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0127.263.8111.773.3-2416.2-351.7100.0100.0100.0100.0106.1123.466.441.5

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value30-43.125-6.632231-46.3383024-62.905160-21.063-103.483-52.664-75.566-30.86720-36.577-27.845302.761-4.761102207-102.4199.85112723-26.076-24.53517-24.26930-31.25721-6.421
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeasePrincipalPayments


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1187000.01249000.01275000.0498000.01192000.01217000.01250000.01368000.01258000.01264000.0
Percentage of FinanceLeasePrincipalPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfOilAndGasProperty

us-gaap:GainLossOnSaleOfOilAndGasProperty


Gain
Period End2021-06-302020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value100.0-0.395-1.28-0.5110.864-0.283-0.595-1.063-0.023-0.233-0.231.09-2.576-0.063-398.752-1.024-1.2749.162-189.934-1.861-1.9341.146-0.359-64.7763.19815-0.051.796108.9421163.3873.6860.099-0.3621.581131.227-0.530.01.918
Percentage of GainLossOnSaleOfOilAndGasProperty100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:GainLossOnSaleOfOtherAssets

us-gaap:GainLossOnSaleOfOtherAssets


Gain
Period End2020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.1711.9082.0372.1062.2662.3262.3712.6552.872.9252.9043.2063.1753.243.3423.4593.493.7723.849
Percentage of GainLossOnSaleOfOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ImpairmentOfOilAndGasProperties

us-gaap:ImpairmentOfOilAndGasProperties


Impairment
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.251.44140937452.1372.553.3369.843197.3028.261085510181429151514171669252671317181730218191862131417139.4787.8047.638144.3543.8573.843
Percentage of ImpairmentOfOilAndGasProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.96618-24.759-18.1633.778-55.56158-38.65839-19.011-20.622-12.987404.54243-27.88525-66.21441-37.821-22.699-44.059-57.95551-91.319-19.31613-88.95378-89.47151374.405-59.385-21.87868-14.9222647-25.8598.1523.70817456.589-3.028
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedTaxesPayable

us-gaap:IncreaseDecreaseInAccruedTaxesPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.5114.204-4.9883.013-1.499-13.084.102-5.346-0.247-3.022-7.1375.2863.2541.1835.6752.649-10.1-9.0-6.321-1.2345.213-5.864-15.633-1.7610-9.422-20.341.981145.216-11.683165.5955.899-9.0977.281-1.0144.918-2.9442.9454.511-3.6081.8885.93
Percentage of IncreaseDecreaseInAccruedTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-0.578-3.906-0.856-1.133-10.58822-2.167-1.545-1.275-2.178-0.608-2.434-2.6591.675-5.9972.028-0.3314.7448.477-3.858-6.341.135-8.24-10.5429.282-44.52753-16.577-1.5281514-9.2962.3598.379-1.871-2.288-3.8075.4313.832-5.923-1.9997.8612.75-1.696-2.0984.431
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInRoyaltiesPayable

us-gaap:IncreaseDecreaseInRoyaltiesPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value19204.4291.261-55.98-9.6291.83613-8.647-32.99434.10918-9.32440-0.388-10.668-5.7269.1518.9885.144-55.4681.393-45.66316-46.982-8.049-9.50316-1.1423.1813420-9.4631220-3.15715-0.2913.7524-6.5346.57610107.636
Percentage of IncreaseDecreaseInRoyaltiesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaid us-gaap:DebtInstrument

us-gaap:InterestPaid

us-gaap:LineOfCredit


Interest
Period End2020-09-01
Value3000000.0
Percentage of InterestPaid100.0

us-gaap:LiabilitiesSubjectToCompromisePeriodIncreaseDecrease us-gaap:StatementScenario

us-gaap:LiabilitiesSubjectToCompromisePeriodIncreaseDecrease

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value-1145600000.0
Percentage of LiabilitiesSubjectToCompromisePeriodIncreaseDecrease100.0

us-gaap:LiabilitiesSubjectToCompromisePeriodIncreaseDecrease us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:EquityAwardsIssuedToCashSettledEquityAwards


Liabilities
Period End2020-09-01
Value-64000.0
Percentage of LiabilitiesSubjectToCompromisePeriodIncreaseDecrease0.0

wll:ReorganizationAdjustments, wll:EquityIssuedToUnsecuredClaimHolders


Liabilities
Period End2020-09-01
Value-1125100000.0
Percentage of LiabilitiesSubjectToCompromisePeriodIncreaseDecrease98.2

wll:ReorganizationAdjustments, wll:OperatingLeaseModificationAndTerminations


Liabilities
Period End2020-09-01
Value-9669000.0
Percentage of LiabilitiesSubjectToCompromisePeriodIncreaseDecrease0.8

wll:ReorganizationAdjustments, wll:PaymentOfContractCureAmounts


Liabilities
Period End2020-09-01
Value-10836000.0
Percentage of LiabilitiesSubjectToCompromisePeriodIncreaseDecrease0.9

us-gaap:LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage

wll:ExitCreditAgreement


Line
Period End2020-09-01
Value0.5
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2.6970.9731.3230.438-0.024-0.8052.4932.351-2.664-0.8286.6040.291.576-1.7642.2472.113-0.2625.1575.4530.7040.1633.8654.4231.7842.091.041.0574.7682.1641.0418.009-1.253.1596.24.3971.0637.3955.8535.2273.334.140.815-0.4822.208
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.0041.3570.00.3040.1340.0030.03.6930.680.960.03.1041.1430.00.0534.8850.1350.00.0350.6740.0150.00.0561.0550.3120.00.267110.0970.00.1145.40.00.00.0385.6570.00.0010.1048.9440.00.024
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.00.0100.0100.0100.00.0100.0

us-gaap:PaymentsToAcquireOilAndGasPropertyAndEquipment

us-gaap:PaymentsToAcquireOilAndGasPropertyAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0390.470.0040.1620.0010.350.0761.4483.6840.8232.2961315.4243.1052.9773.752131.5891.1131.821.3820.4033.4314.6169.35611-12.531131033-15.4063088544181343461670719182681815
Percentage of PaymentsToAcquireOilAndGasPropertyAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireOilAndGasPropertyAndEquipment us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

wll:WillistonBasin, us-gaap:SubsequentEvent


Payments
Period End2021-07-19
Value271
Percentage of PaymentsToAcquireOilAndGasPropertyAndEquipment0.0

us-gaap:PaymentsToAcquireOtherPropertyPlantAndEquipment

us-gaap:PaymentsToAcquireOtherPropertyPlantAndEquipment


Payments
Period End2021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2.597-0.5620.985-1.074-0.7082.1386.0950.553-1.695-0.1322.371.2252.1990.7720.42.5112.242.4382.0666.143-1.6043.8184.909212410240.9726.1498.48529
Percentage of PaymentsToAcquireOtherPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6735249.047714616819923618823420020617221329319013210475982603084197111015796720729596679560573536540530486492476417375284265209154109
Percentage of PaymentsToExploreAndDevelopOilAndGasProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromLongTermLinesOfCredit us-gaap:DebtInstrument

us-gaap:ProceedsFromLongTermLinesOfCredit

wll:CreditAgreement


Proceeds
Period End2021-06-302021-03-31
Value340250
Percentage of ProceedsFromLongTermLinesOfCredit100.0100.0

wll:ExitCreditAgreement


Proceeds
Period End2020-12-312020-09-30
Value19775
Percentage of ProceedsFromLongTermLinesOfCredit0.00.0

us-gaap:ProceedsFromSaleOfOtherProductiveAssets

us-gaap:ProceedsFromSaleOfOtherProductiveAssets


Proceeds
Period End2020-09-30
Value56000.0
Percentage of ProceedsFromSaleOfOtherProductiveAssets100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.9450.00.5320.79275.26251150.2991.4622.361
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, wll:RedtailFieldInWeldCountyColorado, us-gaap:SubsequentEvent


Proceeds
Period End2021-07-21
Value187
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment0.0

us-gaap:ProductionTaxExpense

us-gaap:ProductionTaxExpense


Production
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2524185.908108.4192235353928444643373627273229262625374456445569686059615351424340443834343126262625
Percentage of ProductionTaxExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReorganizationItems

us-gaap:ReorganizationItems


Reorganization
Period End2020-08-312020-06-30
Value-259.23241
Percentage of ReorganizationItems100.0100.0

us-gaap:RepaymentsOfLongTermLinesOfCredit us-gaap:DebtInstrument

us-gaap:RepaymentsOfLongTermLinesOfCredit

us-gaap:LineOfCredit


Repayments
Period End2020-09-012020-06-302020-03-312019-12-31
Value9120.0490660
Percentage of RepaymentsOfLongTermLinesOfCredit100.00.0100.0100.0

wll:CreditAgreement


Repayments
Period End2021-06-302021-03-31
Value470365
Percentage of RepaymentsOfLongTermLinesOfCredit0.00.0

wll:ExitCreditAgreement


Repayments
Period End2020-12-312020-09-30
Value237100
Percentage of RepaymentsOfLongTermLinesOfCredit0.00.0

us-gaap:RestructuringAndRelatedCostIncurredCost us-gaap:RestructuringCostAndReserve

us-gaap:RestructuringAndRelatedCostIncurredCost

us-gaap:OneTimeTerminationBenefits


Restructuring
Period End2020-09-302019-08-31
Value7000000.08000000.0
Percentage of RestructuringAndRelatedCostIncurredCost100.0100.0

us-gaap:ResultsOfOperationsTransportationCosts

us-gaap:ResultsOfOperationsTransportationCosts


Results
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7.4437.0286.0581.984.2599.0448.9631011119.84112121111
Percentage of ResultsOfOperationsTransportationCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost

wll:CancellationOfPredecessorEquity


Share
Period End2020-09-01
Value4000000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost us-gaap:StatementScenario

wll:ReorganizationAdjustments


Share
Period End2020-09-01
Value4000000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-31
Value022.46
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue0.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.7825.2104.33-0.06-2.4-0.8427.910.03
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType, us-gaap:GranteeStatus

wll:ServiceBasedRestrictedStock, srt:ExecutiveOfficer


Share
Period End2021-03-31
Value22.46
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue89.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType, us-gaap:Vesting

wll:PerformanceUnits, wll:AbsoluteTotalStockholderReturnPerformanceShareUnits


Share
Period End2021-06-302021-03-31
Value029.32
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.0116.3

wll:PerformanceUnits, wll:RelativeStockholderReturnPerformanceShareUnits


Share
Period End2021-06-302021-03-31
Value032.33
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.0128.2

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-31
Value3.076.54
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

wll:MarketBasedRestrictedStock


Share
Period End2020-12-312020-09-30
Value040.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate0.0100.0

wll:PerformanceUnits


Share
Period End2021-06-302021-03-31
Value081.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate0.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

wll:MarketBasedRestrictedStock


Share
Period End2020-12-312020-09-30
Value00.66
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate0.0100.0

wll:PerformanceUnits


Share
Period End2021-06-302021-03-31
Value00.17
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate0.00.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation

us-gaap:CommonStock


Shares
Period End2021-03-312020-08-312020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value41000.04000.054000.0130000.019000.020000.00105000.0-260000.008000.0396000.015000.003000.087000.02000.001000.037000.08000.003000.0188000.01000.003000.0111000.0000106000.0-296000.001000.0147000.001000.0
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.00.00.0100.0100.00.0100.0100.00.0100.0

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

us-gaap:StockIssuedDuringPeriodSharesNewIssues

wll:SuccessorBankruptcy, us-gaap:CommonStock


Stock
Period End2020-09-30
Value38
Percentage of StockIssuedDuringPeriodSharesNewIssues100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementEquityComponents

us-gaap:CommonStock


Stock
Period End2021-03-312015-12-312015-09-302015-06-302015-04-012015-03-31
Value0.9490.00.02.02.035
Percentage of StockIssuedDuringPeriodSharesNewIssues0.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardGross us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardGross

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-08-312020-03-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value37000.095000.09000.0185000.045000.063000.00019000.0432000.0-1564000.00161000.02110000.04000.00103000.03918000.007000.034000.01175000.00014000.0894000.00021000.0920000.00023000.0569000.00011000.0293000.002000.019000.0304000.0
Percentage of StockIssuedDuringPeriodSharesRestrictedStockAwardGross100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.0100.0100.0100.0

us-gaap:UnrealizedGainLossOnDerivatives

us-gaap:UnrealizedGainLossOnDerivatives


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-187.85-107.399-50.33529-21.025199-56.3982022-64.43517641-50.104-27.827-73.192-35.46515-38.047-49.051-10.686-31.491-59.92333152-143.676-40.7197725-20.951-23.79321-11.35436-26.16423-1.607107-14.546-87.954142132-123.545-41.477-23.0237530
Percentage of UnrealizedGainLossOnDerivatives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wll:AssetRetirementObligationLiabilitiesRelatedToSoldAssets

wll:AssetRetirementObligationLiabilitiesRelatedToSoldAssets


Asset
Period End2021-06-302021-03-31
Value9.5310.123
Percentage of AssetRetirementObligationLiabilitiesRelatedToSoldAssets100.0100.0

wll:CancellationOfPredecessorEquity

wll:CancellationOfPredecessorEquity


Cancellation
Period End2020-08-31
Value59
Percentage of CancellationOfPredecessorEquity100.0

wll:CancellationOfPredecessorEquity us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Cancellation
Period End2020-08-31
Value6410
Percentage of CancellationOfPredecessorEquity10696.7

us-gaap:CommonStock


Cancellation
Period End2020-08-31
Value0.092
Percentage of CancellationOfPredecessorEquity0.2

us-gaap:RetainedEarnings


Cancellation
Period End2020-08-31
Value-6350.573
Percentage of CancellationOfPredecessorEquity-10596.8

wll:CancellationOfPredecessorEquityShares us-gaap:StatementEquityComponents

wll:CancellationOfPredecessorEquityShares

us-gaap:CommonStock


Cancellation
Period End2020-08-31
Value91
Percentage of CancellationOfPredecessorEquityShares100.0

wll:DebtorReorganizationItemsStockIssuedToEquityHolders us-gaap:StatementScenario

wll:DebtorReorganizationItemsStockIssuedToEquityHolders

wll:ReorganizationAdjustments


Debtor
Period End2020-09-01
Value-34794000.0
Percentage of DebtorReorganizationItemsStockIssuedToEquityHolders100.0

wll:DebtorReorganizationItemsSuccessFeesIncurred us-gaap:StatementScenario

wll:DebtorReorganizationItemsSuccessFeesIncurred

wll:ReorganizationAdjustments


Debtor
Period End2020-09-01
Value17
Percentage of DebtorReorganizationItemsSuccessFeesIncurred100.0

wll:DebtorReorganizationItemsWarrantsIssuedToEquityHolders us-gaap:StatementScenario

wll:DebtorReorganizationItemsWarrantsIssuedToEquityHolders

wll:ReorganizationAdjustments


Debtor
Period End2020-09-01
Value-29360000.0
Percentage of DebtorReorganizationItemsWarrantsIssuedToEquityHolders100.0

wll:DebtorsReorganizationItemsCancellationOfPredecessorEquity us-gaap:StatementScenario

wll:DebtorsReorganizationItemsCancellationOfPredecessorEquity

wll:ReorganizationAdjustments


Debtors
Period End2020-09-01
Value6414
Percentage of DebtorsReorganizationItemsCancellationOfPredecessorEquity100.0

wll:ExplorationExpenseAndImpairmentOfOilAndGasProperties

wll:ExplorationExpenseAndImpairmentOfOilAndGasProperties


Exploration
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.0472.6223.6584.2071042137531010131928111314872172520352425355216905780750293142325474337872327272318202221101412
Percentage of ExplorationExpenseAndImpairmentOfOilAndGasProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wll:OilAndGasNetWellsDrilledNumber us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

wll:OilAndGasNetWellsDrilledNumber

wll:WillistonBasin, us-gaap:SubsequentEvent


Oil
Period End2021-07-19
Value2.3
Percentage of OilAndGasNetWellsDrilledNumber100.0

wll:OilAndGasPropertyLeaseOperatingExpense

wll:OilAndGasPropertyLeaseOperatingExpense


Oil
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value6459551832537272858684379275801190
Percentage of OilAndGasPropertyLeaseOperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wll:OtherIncomeExpenseTotal

wll:OtherIncomeExpenseTotal


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-3.704-2.583-5.822-2.122247-58.162-19.371-42.041-43.705-48.086-47.783-47.218-47.965-47.65-83.179-47.101-47.776-47.494-48.941-312.329-37.922-257.429.107
Percentage of OtherIncomeExpenseTotal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wll:ProvedPropertyMeasurementInput us-gaap:FairValueByAssetClass, us-gaap:MeasurementInputType

wll:ProvedPropertyMeasurementInput

wll:ProvedProperties, us-gaap:MeasurementInputDiscountRate


Proved
Period End2020-09-012020-06-302020-03-31
Value14.00.170.0016
Percentage of ProvedPropertyMeasurementInput100.0100.0100.0

wll:PurchasedGasExpense

wll:PurchasedGasExpense


Purchased
Period End2021-06-302021-03-31
Value1178000.01902000.0
Percentage of PurchasedGasExpense100.0100.0

wll:ReorganizationItemsPaidInCash

wll:ReorganizationItemsPaidInCash


Reorganization
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.00.3967.89514
Percentage of ReorganizationItemsPaidInCash0.0100.0100.0100.0

wll:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsNumberOfSimulations us-gaap:AwardType

wll:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsNumberOfSimulations

wll:MarketBasedRestrictedStock


Share
Period End2020-09-30
Value100000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsNumberOfSimulations100.0

wll:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumFairValueGrantPerNonemployeeDirector

wll:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumFairValueGrantPerNonemployeeDirector


Share
Period End2020-09-01
Value500000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumFairValueGrantPerNonemployeeDirector100.0

wll:StockholdersEquityAdjustedBalanceShares dei:LegalEntity, us-gaap:StatementEquityComponents

wll:StockholdersEquityAdjustedBalanceShares

wll:SuccessorBankruptcy, us-gaap:CommonStock


Stockholders
Period End2020-09-30
Value38
Percentage of StockholdersEquityAdjustedBalanceShares100.0

us-gaap:AccountsPayableTradeCurrent

us-gaap:AccountsPayableTradeCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value515323445647316680528566427788863265704632413677771248910462771441161079210510713114156
Percentage of AccountsPayableTradeCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsPayableTradeCurrent us-gaap:StatementScenario

wll:ReorganizationAdjustments


Accounts
Period End2020-09-01
Value9.264
Percentage of AccountsPayableTradeCurrent16.4

us-gaap:AccruedRoyaltiesCurrent

us-gaap:AccruedRoyaltiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value191171151146145145136192202200186195228184180161171130130141147138129124179178223207254204214197198195160140149137116119103104100758246
Percentage of AccruedRoyaltiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligation


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-09-012019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value991069812712615697136134135126135139135151141137134161176181177171171162161144153192179182165153126110104101976866666987864058308377
Percentage of AssetRetirementObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Asset
Period End2020-09-01
Value-29.582
Percentage of AssetRetirementObligation-23.3

us-gaap:AssetRetirementObligationCurrent

us-gaap:AssetRetirementObligationCurrent


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value6.07.06.08.05.05.04.04.04.03.04.04.03.06.06.05.05.05.06.08.07.08.09.06.08.07.010.012118.37.29.7111111111111117.74.46.06.1
Percentage of AssetRetirementObligationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BankruptcyClaimsAmountPaidToSettleClaims us-gaap:CounterpartyName

us-gaap:BankruptcyClaimsAmountPaidToSettleClaims

wll:GeneralUnsecuredClaimants


Bankruptcy
Period End2021-02-28
Value2000000.0
Percentage of BankruptcyClaimsAmountPaidToSettleClaims100.0

us-gaap:BankruptcyClaimsAmountPaidToSettleClaims us-gaap:CounterpartyName, us-gaap:SubsequentEventType

wll:GeneralUnsecuredClaimants, us-gaap:SubsequentEvent


Bankruptcy
Period End2021-02-28
Value2000000.0
Percentage of BankruptcyClaimsAmountPaidToSettleClaims100.0

us-gaap:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities

us-gaap:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-31
Value1701217118193626815656544953135115493747454558436841854676464344294170413838773579327929723303325630033395312428572645256420661612
Percentage of CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsMineralInterestsInProvedProperties

us-gaap:CapitalizedCostsMineralInterestsInProvedProperties


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value178117431701169337642127022704273427282729273926282623262226583418334333303276329132613206312935413735363717551633
Percentage of CapitalizedCostsMineralInterestsInProvedProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsMineralInterestsInUnprovedProperties

us-gaap:CapitalizedCostsMineralInterestsInUnprovedProperties


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value101102105124909010310510912012214412913213719128436839248257461968977697411041232295372
Percentage of CapitalizedCostsMineralInterestsInUnprovedProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value19291872181218291826488548206023128121271712618123951219511994116671147311293127971360413395132301372114179141281390413795156981568014949121641142110642100659211
Percentage of CapitalizedCostsOilAndGasProducingActivitiesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Capitalized
Period End2020-09-01
Value-3058.899
Percentage of CapitalizedCostsOilAndGasProducingActivitiesGross-167.5

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNet

us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNet


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-31
Value17591751174118102884334271557267730472807258724971097104710881208960896690609582103021054910625108231239412424119468768829677847419664755094275
Percentage of CapitalizedCostsOilAndGasProducingActivitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsUncompletedWellsEquipmentAndFacilities

us-gaap:CapitalizedCostsUncompletedWellsEquipmentAndFacilities


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value46266.3651186139159219228221160247254248244514594542490526515564505463537693760612477524496360
Percentage of CapitalizedCostsUncompletedWellsEquipmentAndFacilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 us-gaap:ClassOfWarrantOrRight

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1

wll:SeriesBWarrant


Class
Period End2020-09-01
Value83.45
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1100.0

wll:SeriesWarrants


Class
Period End2020-09-01
Value73.44
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights188.0

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerAssetNet


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-01-012017-12-31
Value13212688705475161149157178165230210186186
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractualObligation

us-gaap:ContractualObligation


Contractual
Period End2020-12-312018-12-31
Value7.114121
Percentage of ContractualObligation100.0100.0

us-gaap:ContractualObligation us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased

wll:PipelineTransportationAgreements


Contractual
Period End2020-12-312019-12-312018-12-31
Value7.09.30333
Percentage of ContractualObligation98.40.027.1

us-gaap:ContractualObligationDueInFourthYear

us-gaap:ContractualObligationDueInFourthYear


Contractual
Period End2020-12-312018-12-31
Value0.54710
Percentage of ContractualObligationDueInFourthYear100.0100.0

us-gaap:ContractualObligationDueInNextTwelveMonths

us-gaap:ContractualObligationDueInNextTwelveMonths


Contractual
Period End2020-12-312018-12-31
Value2.18946
Percentage of ContractualObligationDueInNextTwelveMonths100.0100.0

us-gaap:ContractualObligationDueInSecondYear

us-gaap:ContractualObligationDueInSecondYear


Contractual
Period End2020-12-312018-12-31
Value2.18913
Percentage of ContractualObligationDueInSecondYear100.0100.0

us-gaap:ContractualObligationDueInThirdYear

us-gaap:ContractualObligationDueInThirdYear


Contractual
Period End2020-12-312018-12-31
Value2.18911
Percentage of ContractualObligationDueInThirdYear100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value36040032803438281828842883288328432893284329333805300533553255363044515173565054505600
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument

wll:ExitCreditAgreement


Debt
Period End2020-12-312020-09-30
Value360400
Percentage of DebtInstrumentCarryingAmount100.0100.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentFaceAmount

wll:ConvertibleSeniorNotes1.25PercentDueTwoThousandTwenty


Debt
Period End2020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312015-03-31
Value1871861862622625625625625625621250
Percentage of DebtInstrumentFaceAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wll:SeniorNotes5.75PercentDueTwoThousandTwentyOne


Debt
Period End2020-08-31
Value774
Percentage of DebtInstrumentFaceAmount413.9

wll:SeniorNotes6.25PercentDueTwoThousandTwentyThree


Debt
Period End2020-08-312015-03-31
Value408750
Percentage of DebtInstrumentFaceAmount218.260.0

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:DebtInstrument

us-gaap:DebtInstrumentUnamortizedDiscount

wll:ConvertibleSeniorNotes1.25PercentDueTwoThousandTwenty


Debt
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312015-03-31
Value2382.8295.6181723293551238
Percentage of DebtInstrumentUnamortizedDiscount100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtWeightedAverageInterestRate us-gaap:DebtInstrument

us-gaap:DebtWeightedAverageInterestRate

wll:CreditAgreement


Debt
Period End2021-06-302021-03-31
Value4.14.2
Percentage of DebtWeightedAverageInterestRate100.0100.0

wll:ExitCreditAgreement


Debt
Period End2020-12-312020-09-30
Value4.14.3
Percentage of DebtWeightedAverageInterestRate0.00.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value15901779634153415081980
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsDerivativeInstruments

us-gaap:DeferredTaxAssetsDerivativeInstruments


Deferred
Period End2020-12-312019-12-312017-12-312016-12-312012-12-312011-12-312010-12-31
Value142.451316.145196077
Percentage of DeferredTaxAssetsDerivativeInstruments100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value60010169309051322919707558648320282
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2489448738281248835588438520172121
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5.0111210119.436119.4932.0041.5080.650.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment


Deferred
Period End2020-12-31
Value291
Percentage of DeferredTaxAssetsPropertyPlantAndEquipment100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value0.1232.0335.6039.704121715139.8525.4312.807
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2332321621181323191714
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesLeasingArrangements


Deferred
Period End2020-12-312019-12-31
Value9.17410
Percentage of DeferredTaxLiabilitiesLeasingArrangements100.0100.0

us-gaap:DerivativeAssetFairValueGrossLiability us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeAssetFairValueGrossLiability

us-gaap:OtherNoncurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-09-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302013-09-302012-12-31
Value214219220.077135.6483.5862.321.925106.7078.2169.49515172.1893.4652752560.5911.329142.189
Percentage of DerivativeAssetFairValueGrossLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PrepaidExpensesAndOtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value7.0011114210.289743.8344.0326.0389.829241121181.5721.9811222531
Percentage of DerivativeAssetFairValueGrossLiability32.827.071.596.7375.31323.8165.30.0313.70.0227.4141.4225.40.0266.0149.00.00.0173.91436.1

us-gaap:DerivativeAssetFairValueGrossLiability us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value285434430.3665080112.5133.8561.3936.1542.32
Percentage of DerivativeAssetFairValueGrossLiability132.8127.0171.5196.7475.3372.21423.8319.20.00.00.0265.30.0

us-gaap:DerivativeAssetFairValueGrossLiability us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2020-12-312019-12-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value34801.3934.0327.9639.8293513193045426910392111100182.1633.309112240279.27133
Percentage of DerivativeAssetFairValueGrossLiability171.51423.80.00.0413.70.0327.4205.4241.4325.4303.7241.63181.52987.4332.1213.8177.90.0366.0249.00.00.0273.90.00.01550.9

us-gaap:DerivativeAssets

us-gaap:DerivativeAssets


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312012-03-31
Value2.4253.4251890.88646255.279688.866
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssets us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:OtherNoncurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-09-302020-03-312019-09-302018-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-09-302012-12-31
Value0.4499.9261.1710.0863.3681.540.9435.4962327330.01929450.9540.1920.9411.864
Percentage of DerivativeAssets18.55.22.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PrepaidExpensesAndOtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-09-302020-06-302019-12-312017-09-302017-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value1.9763.4250.8860.573111355.8880.020.1461.2740.4519.472
Percentage of DerivativeAssets81.5100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeAssets us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2.4253.4251890.88646255.279680.0860.086
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:DerivativeAssets us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2.4253.4251890.88646255.27968
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsCurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:DerivativeAssetsCurrent

us-gaap:FairValueInputsLevel2, us-gaap:CommodityContract


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1.9763.4251790.88645255.27968
Percentage of DerivativeAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsCurrent us-gaap:FinancialInstrument

us-gaap:CommodityContract


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1.9763.4251790.88645255.27968
Percentage of DerivativeAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsNoncurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:DerivativeAssetsNoncurrent

us-gaap:FairValueInputsLevel2, us-gaap:CommodityContract


Derivative
Period End2020-09-302020-03-312019-09-30
Value0.4499.9261.171
Percentage of DerivativeAssetsNoncurrent100.0100.0100.0

us-gaap:DerivativeAssetsNoncurrent us-gaap:FinancialInstrument

us-gaap:CommodityContract


Derivative
Period End2020-09-302020-03-312019-09-30
Value0.4499.9261.171
Percentage of DerivativeAssetsNoncurrent100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:OtherNoncurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-09-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-09-302012-12-31
Value214219220.077235.6484.7572.4061.92510109.7569.49516232531615286451.5451.521154.053
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PrepaidExpensesAndOtherCurrentAssets, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value7.0011114233.714753.8344.0326.0389.8292523211547.462.012232640
Percentage of DerivativeFairValueOfDerivativeAsset32.827.071.5103.54823.41339.5159.40.0313.70.0232.7241.1225.4339.5482.8131.50.00.0166.41009.4

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value285434463.7912398157289.135696.242.406
Percentage of DerivativeFairValueOfDerivativeAsset132.8127.0171.5203.54923.41020.41439.51212.00.00.00.0259.40.0

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2020-12-312019-12-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value3481694.0327.9639.829357670811289722129025214324019916163460731015935282919
Percentage of DerivativeFairValueOfDerivativeAsset171.51439.50.00.0413.70.0332.7754.7724.5858.7798.5419.8854.8923.7408.4275.3278.6439.51083.41105.70.00.0463.20.00.0864.80.00.00.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:OtherCurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value27214563291.7336857.8592.5135.2281.393
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-09-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7429260.943136.5343.6824.2262.2214545511922267.1256.327357256
Percentage of DerivativeFairValueOfDerivativeLiability51.346.688.854.536.77.746.90.00.00.00.00.00.00.00.00.00.00.00.00.0

wll:DerivativeLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value63851.39311015310514249303439
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.00.00.00.00.00.00.00.00.0

wll:LongTermDerivativeLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302020-12-31
Value11029
Percentage of DerivativeFairValueOfDerivativeLiability40.746.6

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312014-12-312014-09-30
Value38222093552.6735091112.5135.2281.393114110180.591
Percentage of DerivativeFairValueOfDerivativeLiability140.7151.3146.6188.8154.5136.7107.7146.9100.0100.0100.00.00.00.00.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2020-12-312019-12-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value93911.393153107142957585585654188107103146100182.192272325613729234140121
Percentage of DerivativeFairValueOfDerivativeLiability146.6107.7100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeInstrumentsAndHedgesLiabilities

us-gaap:DerivativeInstrumentsAndHedgesLiabilities


Derivative
Period End2021-06-302021-03-312020-12-312020-09-012020-08-312019-12-312018-09-302017-12-31
Value26513449252510106132
Percentage of DerivativeInstrumentsAndHedgesLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsAndHedgesLiabilitiesNoncurrent

us-gaap:DerivativeInstrumentsAndHedgesLiabilitiesNoncurrent


Derivative
Period End2021-06-302020-12-31
Value899.75
Percentage of DerivativeInstrumentsAndHedgesLiabilitiesNoncurrent100.0100.0

us-gaap:DerivativeLiabilities

us-gaap:DerivativeLiabilities


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-03-31
Value35416659112.307110.0961.372
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilities us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:OtherCurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-03-31
Value265134497.6671.441101.372
Percentage of DerivativeLiabilities74.880.783.567.762.592.1100.0

us-gaap:OtherNoncurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302018-09-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value329.753.6590.8660.8860.0961.9060.296343842107.5678.534.9362.8628.00720
Percentage of DerivativeLiabilities19.316.532.337.57.9100.00.00.00.00.00.00.00.00.00.00.00.00.0

wll:DerivativeLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312019-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value49101061499913225232317
Percentage of DerivativeLiabilities83.592.10.00.00.00.00.00.00.00.0

wll:LongTermDerivativeLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302020-12-31
Value899.75
Percentage of DerivativeLiabilities25.216.5

us-gaap:DerivativeLiabilities us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-03-312018-09-302017-12-31
Value35416659112.307110.0961.372108106
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:DerivativeLiabilities us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-03-31
Value35416659112.307110.0961.372
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2020-12-312019-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-12-312016-09-302016-06-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-03-312011-12-312011-09-302011-06-302010-12-31
Value591110814999693.1320.218180.9451.542270.02924113.482202313112152160164
Percentage of DerivativeLiabilities100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeLiabilities us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2020-12-312019-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-03-312011-12-312011-09-302011-06-302010-12-31
Value5911108149991325961662710111184.02710350.02924113.482202313112152160164
Percentage of DerivativeLiabilities100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeLiabilities us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2020-12-312019-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-03-312011-12-312011-09-302011-06-302010-12-31
Value5911149991325961662710111184.02710350.02924113.4822010192313112152160164
Percentage of DerivativeLiabilities100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommodityContract


Derivative
Period End2020-12-312019-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-12-312016-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value491010614999691.7620.218140.029130.02924113.482199.2621821332373
Percentage of DerivativeLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesCurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:CommodityContract


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-03-31
Value265134497.667101.372
Percentage of DerivativeLiabilitiesCurrent0.00.0100.00.0100.00.0

us-gaap:DerivativeLiabilitiesCurrent us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:CommodityContract


Derivative
Period End2020-12-312019-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value491010614999132252323172.9742.8962.3011.1652.762150.02924113.482199.2621821332373
Percentage of DerivativeLiabilitiesCurrent100.0100.0100.0100.0100.0191.41427.10.010692.2120.210255.20.00.00.00.0113.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesCurrent us-gaap:FinancialInstrument

us-gaap:CommodityContract


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-03-31
Value265134497.667101.372
Percentage of DerivativeLiabilitiesCurrent0.00.0100.00.0100.00.0

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

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommodityContract


Derivative
Period End2020-12-312019-12-312018-09-302018-03-312017-09-302016-12-312016-09-302016-06-302015-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value9.750.8861.9060.2961.373.9790.9161.542140.4990.8570.9671.6787.9311747
Percentage of DerivativeLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesNoncurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:CommodityContract


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value89329.753.6590.8860.096
Percentage of DerivativeLiabilitiesNoncurrent0.00.0100.00.0100.00.0

us-gaap:DerivativeLiabilitiesNoncurrent us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:CommodityContract


Derivative
Period End2020-12-312019-12-312018-09-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value9.750.8861.9060.296343842107.5678.534.9362.8628.007200.4990.8570.9671.6787.9311747
Percentage of DerivativeLiabilitiesNoncurrent100.0100.0100.0100.02537.30.00.0257.1826.1553.20.00.00.0140.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesNoncurrent us-gaap:FinancialInstrument

us-gaap:CommodityContract


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value89329.753.6590.8860.096
Percentage of DerivativeLiabilitiesNoncurrent0.00.0100.00.0100.00.0

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilityFairValueGrossAsset

us-gaap:OtherCurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value7.0011114210.28936747.8592.5133.8561.393
Percentage of DerivativeLiabilityFairValueGrossAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncurrentLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-09-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4219220.077135.6483.5862.321.925106.7078.2169.49515172.1893.465275256
Percentage of DerivativeLiabilityFairValueGrossAsset370.9139.9103.426.636.77.645.60.00.00.00.00.00.00.00.00.00.00.00.00.0

wll:DerivativeLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value14741.3933.8344.0326.0389.829247.0711121
Percentage of DerivativeLiabilityFairValueGrossAsset100.0100.0100.00.00.00.00.00.00.00.00.0

wll:LongTermDerivativeLiabilities, us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302020-12-31
Value2119
Percentage of DerivativeLiabilityFairValueGrossAsset304.6139.9

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:CommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312014-12-312014-09-30
Value285434430.3665080112.5133.8561.3936.1543.834180.591
Percentage of DerivativeLiabilityFairValueGrossAsset404.6470.9239.9203.4126.6136.7107.6145.6100.0100.0100.00.00.00.00.0

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2020-12-312019-12-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value34801.3934.0327.9639.8293513193045426910392111100182.1633.309112240279.27133
Percentage of DerivativeLiabilityFairValueGrossAsset239.9107.6100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeNonmonetaryNotionalAmount us-gaap:Energy

us-gaap:DerivativeNonmonetaryNotionalAmount

srt:CrudeOil


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value202115154.3015101110
Percentage of DerivativeNonmonetaryNotionalAmount100.0100.0100.0100.0100.0100.0100.0100.0

srt:NaturalGasPerThousandCubicFeet


Derivative
Period End2021-06-302021-04-302021-03-312020-12-312020-09-30
Value352.73393536
Percentage of DerivativeNonmonetaryNotionalAmount175.50.0184.3224.1241.7

us-gaap:PublicUtilitiesInventoryPropane


Derivative
Period End2021-06-302021-03-31
Value2317
Percentage of DerivativeNonmonetaryNotionalAmount114.480.6

wll:CrudeOilDifferentials


Derivative
Period End2021-06-30
Value0.0765
Percentage of DerivativeNonmonetaryNotionalAmount0.4

wll:NaturalGasBasis


Derivative
Period End2021-06-302021-04-302021-03-31
Value112.7311
Percentage of DerivativeNonmonetaryNotionalAmount59.20.051.3

us-gaap:DerivativeNonmonetaryNotionalAmount us-gaap:Energy, us-gaap:StatementScenario

srt:CrudeOil, wll:DerivativeMaturitiesFor2021


Derivative
Period End2020-07-01
Value3.739
Percentage of DerivativeNonmonetaryNotionalAmount0.0

srt:CrudeOil, wll:DerivativeMaturitiesFor2022


Derivative
Period End2020-07-01
Value1.365
Percentage of DerivativeNonmonetaryNotionalAmount0.0

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2020


Derivative
Period End2020-07-01
Value3.66
Percentage of DerivativeNonmonetaryNotionalAmount0.0

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2022


Derivative
Period End2020-07-01
Value8.19
Percentage of DerivativeNonmonetaryNotionalAmount0.0

us-gaap:DerivativeNonmonetaryNotionalAmount us-gaap:Energy, us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk

srt:CrudeOil, wll:DerivativeMaturitiesFor2020, us-gaap:Swap


Derivative
Period End2020-09-302020-06-302020-03-312019-12-31
Value1.0581.5643.664.883
Percentage of DerivativeNonmonetaryNotionalAmount7.036.435.141.9

srt:CrudeOil, wll:DerivativeMaturitiesFor2020, wll:TwoWayCollars


Derivative
Period End2020-09-302020-07-012020-03-312019-12-31
Value1.7940.8542.4771.648
Percentage of DerivativeNonmonetaryNotionalAmount11.80.023.714.1

srt:CrudeOil, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3.5884.72354.3862.73752.7375
Percentage of DerivativeNonmonetaryNotionalAmount17.822.027.618.163.6

srt:CrudeOil, wll:DerivativeMaturitiesFor2021, wll:TwoWayCollars


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value3.1624.7966.9566.0435
Percentage of DerivativeNonmonetaryNotionalAmount15.722.343.839.9

srt:CrudeOil, wll:DerivativeMaturitiesFor2022, wll:TwoWayCollars


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value9.5599.1974.533.518
Percentage of DerivativeNonmonetaryNotionalAmount47.342.828.523.2

srt:CrudeOil, wll:DerivativeMaturitiesFor2023, wll:TwoWayCollars


Derivative
Period End2021-06-302021-04-302021-03-31
Value3.25950.5462.16
Percentage of DerivativeNonmonetaryNotionalAmount16.10.010.0

srt:CrudeOil, wll:DerivativeMaturitiesForMarch2023, wll:TwoWayCollars


Derivative
Period End2021-01-01
Value1.98
Percentage of DerivativeNonmonetaryNotionalAmount0.0

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2020, us-gaap:Swap


Derivative
Period End2020-09-30
Value2.44
Percentage of DerivativeNonmonetaryNotionalAmount16.1

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2020, wll:TwoWayCollars


Derivative
Period End2020-09-30
Value1.83
Percentage of DerivativeNonmonetaryNotionalAmount12.1

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2021, us-gaap:BasisSwap


Derivative
Period End2021-01-01
Value6.12
Percentage of DerivativeNonmonetaryNotionalAmount0.0

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value8.971412113.65
Percentage of DerivativeNonmonetaryNotionalAmount44.467.178.978.184.9

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2021, wll:TwoWayCollars


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-07-01
Value5.528.25101010
Percentage of DerivativeNonmonetaryNotionalAmount27.338.469.072.30.0

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2022, us-gaap:Swap


Derivative
Period End2021-06-302021-04-302021-03-312020-12-312020-09-30
Value5.2591.3653.531.3651.365
Percentage of DerivativeNonmonetaryNotionalAmount26.00.016.48.69.0

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2022, wll:TwoWayCollars


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value1010108.19
Percentage of DerivativeNonmonetaryNotionalAmount53.149.867.554.1

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2023, wll:TwoWayCollars


Derivative
Period End2021-06-302021-04-302021-03-31
Value4.9751.3652.7
Percentage of DerivativeNonmonetaryNotionalAmount24.60.012.6

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesForMarch2023, wll:TwoWayCollars


Derivative
Period End2021-01-01
Value1.8
Percentage of DerivativeNonmonetaryNotionalAmount0.0

us-gaap:PublicUtilitiesInventoryPropane, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-302021-03-31
Value1917
Percentage of DerivativeNonmonetaryNotionalAmount95.780.6

us-gaap:PublicUtilitiesInventoryPropane, wll:DerivativeMaturitiesFor2022, us-gaap:Swap


Derivative
Period End2021-06-30
Value3.78
Percentage of DerivativeNonmonetaryNotionalAmount18.7

wll:CrudeOilBasis, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-04-30
Value0.107
Percentage of DerivativeNonmonetaryNotionalAmount0.0

wll:CrudeOilDifferentials, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-30
Value0.0765
Percentage of DerivativeNonmonetaryNotionalAmount0.4

wll:NaturalGasBasis, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-302021-03-31
Value3.685.5
Percentage of DerivativeNonmonetaryNotionalAmount18.225.6

wll:NaturalGasBasis, wll:DerivativeMaturitiesFor2022, us-gaap:Swap


Derivative
Period End2021-06-302021-04-302021-03-31
Value3.531.3652.165
Percentage of DerivativeNonmonetaryNotionalAmount17.50.010.1

wll:NaturalGasBasis, wll:DerivativeMaturitiesFor2023, us-gaap:Swap


Derivative
Period End2021-06-302021-04-302021-03-31
Value4.741.3653.375
Percentage of DerivativeNonmonetaryNotionalAmount23.50.015.7

us-gaap:DerivativeNonmonetaryNotionalAmount us-gaap:Energy, us-gaap:StatementScenario, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType

srt:CrudeOil, wll:DerivativeMaturitiesFor2021, us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, wll:RedtailFieldInWeldCountyColorado, us-gaap:SubsequentEvent


Derivative
Period End2021-07-21
Value0.321
Percentage of DerivativeNonmonetaryNotionalAmount0.0

srt:CrudeOil, wll:DerivativeMaturitiesFor2022, us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, wll:RedtailFieldInWeldCountyColorado, us-gaap:SubsequentEvent


Derivative
Period End2021-07-21
Value0.8445
Percentage of DerivativeNonmonetaryNotionalAmount0.0

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2021, us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, wll:RedtailFieldInWeldCountyColorado, us-gaap:SubsequentEvent


Derivative
Period End2021-07-21
Value0.87
Percentage of DerivativeNonmonetaryNotionalAmount0.0

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2022, us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, wll:RedtailFieldInWeldCountyColorado, us-gaap:SubsequentEvent


Derivative
Period End2021-07-21
Value3.125
Percentage of DerivativeNonmonetaryNotionalAmount0.0

us-gaap:DerivativeSwapTypeAverageFixedPrice us-gaap:Energy, us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeSwapTypeAverageFixedPrice

srt:CrudeOil, wll:DerivativeMaturitiesFor2020, us-gaap:Swap


Derivative
Period End2020-09-302020-06-302020-03-31
Value41.0140.9654.97
Percentage of DerivativeSwapTypeAverageFixedPrice100.0100.0100.0

srt:CrudeOil, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-302021-03-312020-09-302020-06-30
Value45.444.4440.0540.05
Percentage of DerivativeSwapTypeAverageFixedPrice0.00.097.797.8

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2020, us-gaap:Swap


Derivative
Period End2020-09-30
Value2.5
Percentage of DerivativeSwapTypeAverageFixedPrice6.1

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-302021-03-312020-09-302020-06-30
Value2.812.812.662.6
Percentage of DerivativeSwapTypeAverageFixedPrice0.00.06.56.3

srt:NaturalGasPerThousandCubicFeet, wll:DerivativeMaturitiesFor2022, us-gaap:Swap


Derivative
Period End2021-06-302021-04-302021-03-312020-09-30
Value2.682.492.652.6
Percentage of DerivativeSwapTypeAverageFixedPrice0.00.00.06.3

us-gaap:PublicUtilitiesInventoryPropane, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-302021-03-31
Value0.780.76
Percentage of DerivativeSwapTypeAverageFixedPrice0.00.0

us-gaap:PublicUtilitiesInventoryPropane, wll:DerivativeMaturitiesFor2022, us-gaap:Swap


Derivative
Period End2021-06-30
Value0.81
Percentage of DerivativeSwapTypeAverageFixedPrice0.0

wll:CrudeOilBasis, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-04-30
Value1.95
Percentage of DerivativeSwapTypeAverageFixedPrice0.0

wll:CrudeOilDifferentials, wll:DerivativeMaturitiesFor2021, us-gaap:Swap


Derivative
Period End2021-06-30
Value1.95
Percentage of DerivativeSwapTypeAverageFixedPrice0.0

wll:NaturalGasBasis, wll:DerivativeMaturitiesFor2022, us-gaap:Swap


Derivative
Period End2021-06-302021-04-302021-03-31
Value0.140.220.5
Percentage of DerivativeSwapTypeAverageFixedPrice0.00.00.0

wll:NaturalGasBasis, wll:DerivativeMaturitiesFor2023, us-gaap:Swap


Derivative
Period End2021-06-302021-04-302021-03-31
Value0.070.220.37
Percentage of DerivativeSwapTypeAverageFixedPrice0.00.00.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value5.36121353023169.9993123168.766323.202
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions


Employee
Period End2020-12-31
Value2000000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions100.0

us-gaap:EnergyRelatedInventoryPetroleum

us-gaap:EnergyRelatedInventoryPetroleum


Energy
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value6000000.06000000.05000000.07000000.08000000.08000000.0
Percentage of EnergyRelatedInventoryPetroleum100.0100.0100.0100.0100.0100.0

us-gaap:EscrowDeposit us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

us-gaap:EscrowDeposit

wll:WillistonBasin, us-gaap:SubsequentEvent


Escrow
Period End2021-07-19
Value23
Percentage of EscrowDeposit100.0

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiability


Finance
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value1721222222
Percentage of FinanceLeaseLiability100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityCurrent


Finance
Period End2020-12-312019-12-31
Value4830000.04974000.0
Percentage of FinanceLeaseLiabilityCurrent100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityNoncurrent


Finance
Period End2020-12-312019-12-31
Value1316
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDue


Finance
Period End2020-12-31
Value19
Percentage of FinanceLeaseLiabilityPaymentsDue100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths


Finance
Period End2020-12-31
Value5489000.0
Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive


Finance
Period End2020-12-31
Value2385000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFive100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour


Finance
Period End2020-12-31
Value3214000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFour100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree


Finance
Period End2020-12-31
Value3833000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearThree100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo


Finance
Period End2020-12-31
Value4693000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearTwo100.0

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount


Finance
Period End2020-12-31
Value1646000.0
Percentage of FinanceLeaseLiabilityUndiscountedExcessAmount100.0

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAsset


Finance
Period End2020-12-312019-12-31
Value1719
Percentage of FinanceLeaseRightOfUseAsset100.0100.0

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent


Finance
Period End2020-12-312019-12-31
Value4.28.6
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseAccountsPayable us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:FreshStartAdjustmentIncreaseDecreaseAccountsPayable

wll:ReorganizationAdjustments, wll:PaymentOfProfessionalFees


Fresh
Period End2020-09-01
Value2000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseAccountsPayable100.0

wll:ReorganizationAdjustments, wll:ReinstatementOfAccountsPayableSubjectToCompromise


Fresh
Period End2020-09-01
Value11000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseAccountsPayable550.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseAccruedLiabilities us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:FreshStartAdjustmentIncreaseDecreaseAccruedLiabilities

wll:FreshStartAccountingAdjustments, us-gaap:RevaluationOfAssets


Fresh
Period End2020-09-01
Value7000000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseAccruedLiabilities100.0

wll:FreshStartAccountingAdjustments, us-gaap:RevaluationOfLiabilities


Fresh
Period End2020-09-01
Value7000000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseAccruedLiabilities100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseAccumulatedDepreciationAndAmortization us-gaap:StatementScenario

us-gaap:FreshStartAdjustmentIncreaseDecreaseAccumulatedDepreciationAndAmortization

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value-66000000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseAccumulatedDepreciationAndAmortization100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents us-gaap:StatementScenario

us-gaap:FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents

wll:ReorganizationAdjustments


Fresh
Period End2020-09-01
Value-524.697
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:AccruedInterestPredecessorCreditAgreement


Fresh
Period End2020-09-01
Value-3.0
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents0.6

wll:ReorganizationAdjustments, wll:BorrowingsUnderExitCreditAgreement


Fresh
Period End2020-09-01
Value425
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents-81.1

wll:ReorganizationAdjustments, wll:FundingOfProfessionalFeeEscrowAccount


Fresh
Period End2020-09-01
Value-26.0
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents5.0

wll:ReorganizationAdjustments, wll:PaymentOfAccruedInterest


Fresh
Period End2020-09-01
Value-3.437
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents0.7

wll:ReorganizationAdjustments, wll:PaymentOfBorrowings


Fresh
Period End2020-09-01
Value-912.259
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents173.9

wll:ReorganizationAdjustments, wll:PaymentOfContractCureAmounts


Fresh
Period End2020-09-01
Value-11.114
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents2.1

wll:ReorganizationAdjustments, wll:PaymentOfDebtIssuanceCosts


Fresh
Period End2020-09-01
Value-10.95
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents2.1

wll:ReorganizationAdjustments, wll:PaymentOfProfessionalFees


Fresh
Period End2020-09-01
Value-14.47
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents2.8

wll:ReorganizationAdjustments, wll:ReinstatementOfRestrictedCash


Fresh
Period End2020-09-01
Value28
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents-5.4

wll:ReorganizationAdjustments, wll:SourceOfCash


Fresh
Period End2020-09-01
Value453
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents-86.4

wll:ReorganizationAdjustments, wll:UseOfCash


Fresh
Period End2020-09-01
Value-978.23
Percentage of FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents186.4

us-gaap:FreshStartAdjustmentIncreaseDecreaseCommonStock us-gaap:StatementScenario

us-gaap:FreshStartAdjustmentIncreaseDecreaseCommonStock

wll:ReorganizationAdjustments


Fresh
Period End2020-09-01
Value1189
Percentage of FreshStartAdjustmentIncreaseDecreaseCommonStock100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseCommonStock us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:EquityIssuedToPredecessorAndHoldersOfUnvestedCashSettledEquityAwards


Fresh
Period End2020-09-01
Value34
Percentage of FreshStartAdjustmentIncreaseDecreaseCommonStock2.9

wll:ReorganizationAdjustments, wll:EquityIssuedToUnsecuredClaimHolders


Fresh
Period End2020-09-01
Value1125
Percentage of FreshStartAdjustmentIncreaseDecreaseCommonStock94.6

wll:ReorganizationAdjustments, wll:WarrantsIssuedToPredecessorHoldersAndHoldersOfUnvestedCashSettledEquityAwards


Fresh
Period End2020-09-01
Value29
Percentage of FreshStartAdjustmentIncreaseDecreaseCommonStock2.5

us-gaap:FreshStartAdjustmentIncreaseDecreaseLiabilities us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:FreshStartAdjustmentIncreaseDecreaseLiabilities

wll:FreshStartAccountingAdjustments, us-gaap:RevaluationOfLiabilities


Fresh
Period End2020-09-01
Value9000000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseLiabilities100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherAssetsNoncurrent us-gaap:StatementScenario

us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherAssetsNoncurrent

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value2000000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseOtherAssetsNoncurrent100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherNoncurrentObligations us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherNoncurrentObligations

wll:FreshStartAccountingAdjustments, us-gaap:RevaluationOfLiabilities


Fresh
Period End2020-09-01
Value2000000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseOtherNoncurrentObligations100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherPropertyAndEquipment us-gaap:StatementScenario

us-gaap:FreshStartAdjustmentIncreaseDecreaseOtherPropertyAndEquipment

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value-61000000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseOtherPropertyAndEquipment100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseReceivablesNet us-gaap:StatementScenario

us-gaap:FreshStartAdjustmentIncreaseDecreaseReceivablesNet

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value-81000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseReceivablesNet100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent us-gaap:StatementScenario

us-gaap:FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent

wll:ReorganizationAdjustments


Fresh
Period End2020-09-01
Value-2.205
Percentage of FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent100.0

us-gaap:FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent us-gaap:StatementScenario, us-gaap:FreshStartAdjustmentsTypeOfFreshStartAdjustment

wll:ReorganizationAdjustments, wll:AssuranceForUtilityProviders


Fresh
Period End2020-09-01
Value5.0
Percentage of FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent-226.8

wll:ReorganizationAdjustments, wll:DerivativeSettlement


Fresh
Period End2020-09-01
Value23
Percentage of FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent-1043.1

wll:ReorganizationAdjustments, wll:FundingOfProfessionalFeeEscrowAccount


Fresh
Period End2020-09-01
Value26
Percentage of FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent-1179.1

wll:ReorganizationAdjustments, wll:ReinstatementOfRestrictedCash


Fresh
Period End2020-09-01
Value-28.205
Percentage of FreshStartAdjustmentIncreaseDecreaseRestrictedCashAndCashEquivalentsCurrent1279.1

us-gaap:FreshStartAdjustmentIncreaseDecreaseRetainedEarningsDeficit us-gaap:StatementScenario

us-gaap:FreshStartAdjustmentIncreaseDecreaseRetainedEarningsDeficit

wll:ReorganizationAdjustments


Fresh
Period End2020-09-01
Value7650
Percentage of FreshStartAdjustmentIncreaseDecreaseRetainedEarningsDeficit100.0

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2020-12-312020-09-302020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value361.4323.4593.5932533356355535593840244024449.052545162736742671843174410
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Interest
Period End2020-09-01
Value-0.127
Percentage of InterestPayableCurrent0.0

wll:ReorganizationAdjustments


Interest
Period End2020-09-01
Value-3.332
Percentage of InterestPayableCurrent0.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value4500000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LiabilitiesSubjectToCompromise

us-gaap:LiabilitiesSubjectToCompromise


Liabilities
Period End2020-08-312020-06-30
Value25262549
Percentage of LiabilitiesSubjectToCompromise100.0100.0

us-gaap:LiabilitiesSubjectToCompromise us-gaap:StatementScenario

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-012020-08-31
Value-2526.9252526
Percentage of LiabilitiesSubjectToCompromise0.0100.0

us-gaap:LiabilitiesSubjectToCompromiseOtherLiabilities us-gaap:StatementScenario

us-gaap:LiabilitiesSubjectToCompromiseOtherLiabilities

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value11
Percentage of LiabilitiesSubjectToCompromiseOtherLiabilities100.0

us-gaap:LineOfCredit us-gaap:DebtInstrument

us-gaap:LineOfCredit

wll:CreditAgreement


Line
Period End2021-06-302021-03-31
Value115245
Percentage of LineOfCredit100.0100.0

wll:ExitCreditAgreement


Line
Period End2020-12-312020-09-30
Value360400
Percentage of LineOfCredit0.00.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LetterOfCredit


Line
Period End2020-09-01
Value50
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LineOfCredit


Line
Period End2020-08-31
Value2049
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity0.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

wll:CreditAgreement


Line
Period End2021-06-302021-03-31
Value633503
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0

wll:ExitCreditAgreement


Line
Period End2020-12-312020-09-30
Value388348
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.00.0

us-gaap:MaterialsSuppliesAndOther

us-gaap:MaterialsSuppliesAndOther


Materials
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value293923243369
Percentage of MaterialsSuppliesAndOther100.0100.0100.0100.0100.0100.0

us-gaap:OilAndGasReclamationLiabilityNoncurrent

us-gaap:OilAndGasReclamationLiabilityNoncurrent


Oil
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9399911191211509113213113213313613114713513112915717117416816416315315513714618216717015714611699898986575554618280777666
Percentage of OilAndGasReclamationLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OilAndGasReclamationLiabilityNoncurrent us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Oil
Period End2020-09-01
Value-29.582
Percentage of OilAndGasReclamationLiabilityNoncurrent-24.4

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-31
Value4.44.6
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:OperatingLossCarryforwards

us-gaap:OperatingLossCarryforwards


Operating
Period End2020-12-312020-09-01
Value31003500
Percentage of OperatingLossCarryforwards100.0100.0

us-gaap:OperatingLossCarryforwardsValuationAllowance

us-gaap:OperatingLossCarryforwardsValuationAllowance


Operating
Period End2021-06-302021-03-312020-09-30
Value230023002600
Percentage of OperatingLossCarryforwardsValuationAllowance100.0100.0100.0

us-gaap:OtherSundryLiabilitiesCurrent

us-gaap:OtherSundryLiabilitiesCurrent


Other
Period End2020-09-01
Value143
Percentage of OtherSundryLiabilitiesCurrent100.0

us-gaap:PostconfirmationStockholdersEquity

us-gaap:PostconfirmationStockholdersEquity


Postconfirmation
Period End2020-09-01
Value1189
Percentage of PostconfirmationStockholdersEquity100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization


Property
Period End2021-06-302020-12-31
Value17773
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization


Property
Period End2021-06-302020-12-31
Value18201812
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization


Property
Period End2021-06-302020-12-31
Value19971886
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization100.0100.0

us-gaap:PropertyPlantAndEquipmentOther

us-gaap:PropertyPlantAndEquipmentOther


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value686674727115917317917817616816913413413713413413413613213413515916516816429229427625723422520617616917114115215514815014414010898100
Percentage of PropertyPlantAndEquipmentOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentOther us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Property
Period End2020-09-01
Value-87.642
Percentage of PropertyPlantAndEquipmentOther-122.9

wll:ReorganizationAdjustments


Property
Period End2020-09-01
Value-0.909
Percentage of PropertyPlantAndEquipmentOther-1.3

us-gaap:ReorganizationValue

us-gaap:ReorganizationValue


Reorganization
Period End2020-09-01
Value2142
Percentage of ReorganizationValue100.0

us-gaap:ReorganizationValuePresentValueOfDiscountedCashFlowsOfEmergingEntity

us-gaap:ReorganizationValuePresentValueOfDiscountedCashFlowsOfEmergingEntity


Reorganization
Period End2020-09-01
Value1590
Percentage of ReorganizationValuePresentValueOfDiscountedCashFlowsOfEmergingEntity100.0

us-gaap:ReorganizationValuePresentValueOfDiscountedCashFlowsOfEmergingEntity us-gaap:Range

srt:Maximum


Reorganization
Period End2020-09-01
Value1750
Percentage of ReorganizationValuePresentValueOfDiscountedCashFlowsOfEmergingEntity110.1

srt:Minimum


Reorganization
Period End2020-09-01
Value1350
Percentage of ReorganizationValuePresentValueOfDiscountedCashFlowsOfEmergingEntity84.9

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-30
Value2.4012.42.7613262826
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue us-gaap:StatementScenario

wll:ReorganizationAdjustments


Restricted
Period End2020-09-01
Value-2.205
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue-8.2

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value23.3822.4510.0325.4524.3328.2828.2631.7732.8734.9434.7844.9954.19
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount

wll:PipelineTransportationAgreements


Unrecorded
Period End2020-12-312019-12-312017-12-312016-12-312015-12-312014-12-31
Value5.09.038434994
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount100.0100.0100.0100.0100.0100.0

wll:AccumulatedDepreciationDepletionAndAmortizationFreshStart

wll:AccumulatedDepreciationDepletionAndAmortizationFreshStart


Accumulated
Period End2020-08-31
Value2085
Percentage of AccumulatedDepreciationDepletionAndAmortizationFreshStart100.0

wll:AccumulatedDepreciationDepletionAndAmortizationFreshStart us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Accumulated
Period End2020-09-01
Value-2085.266
Percentage of AccumulatedDepreciationDepletionAndAmortizationFreshStart0.0

wll:CashBalancePriorToMandatoryBorrowingRepayment us-gaap:DebtInstrument

wll:CashBalancePriorToMandatoryBorrowingRepayment

wll:CreditAgreement


Cash
Period End2020-09-01
Value75
Percentage of CashBalancePriorToMandatoryBorrowingRepayment100.0

wll:ExitCreditAgreement


Cash
Period End2020-09-01
Value75
Percentage of CashBalancePriorToMandatoryBorrowingRepayment100.0

wll:DebtCovenantConsolidatedCurrentAssetsToCurrentLiabilitiesRatioRequirementMinimum us-gaap:DebtInstrument

wll:DebtCovenantConsolidatedCurrentAssetsToCurrentLiabilitiesRatioRequirementMinimum

wll:CreditAgreement


Debt
Period End2020-09-01
Value1.0
Percentage of DebtCovenantConsolidatedCurrentAssetsToCurrentLiabilitiesRatioRequirementMinimum100.0

wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value1.0
Percentage of DebtCovenantConsolidatedCurrentAssetsToCurrentLiabilitiesRatioRequirementMinimum100.0

wll:DebtCovenantTotalDebtToEarningsBeforeInterestTaxesDepreciationAmortizationAndExplorationExpenseRatioRequirement us-gaap:DebtInstrument

wll:DebtCovenantTotalDebtToEarningsBeforeInterestTaxesDepreciationAmortizationAndExplorationExpenseRatioRequirement

wll:CreditAgreement


Debt
Period End2020-09-01
Value3.5
Percentage of DebtCovenantTotalDebtToEarningsBeforeInterestTaxesDepreciationAmortizationAndExplorationExpenseRatioRequirement100.0

wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value3.5
Percentage of DebtCovenantTotalDebtToEarningsBeforeInterestTaxesDepreciationAmortizationAndExplorationExpenseRatioRequirement100.0

wll:DebtInstrumentCommodityHedgesCoveringProductionCurrentPercent us-gaap:DebtInstrument

wll:DebtInstrumentCommodityHedgesCoveringProductionCurrentPercent

wll:CreditAgreement


Debt
Period End2020-09-01
Value65.0
Percentage of DebtInstrumentCommodityHedgesCoveringProductionCurrentPercent100.0

wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value65.0
Percentage of DebtInstrumentCommodityHedgesCoveringProductionCurrentPercent100.0

wll:DebtInstrumentCommodityHedgesCoveringProductionFromProvedReservesMaximumPercent us-gaap:DebtInstrument

wll:DebtInstrumentCommodityHedgesCoveringProductionFromProvedReservesMaximumPercent

wll:CreditAgreement


Debt
Period End2020-09-01
Value85.0
Percentage of DebtInstrumentCommodityHedgesCoveringProductionFromProvedReservesMaximumPercent100.0

wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value85.0
Percentage of DebtInstrumentCommodityHedgesCoveringProductionFromProvedReservesMaximumPercent100.0

wll:DebtInstrumentCommodityHedgesCoveringProductionYear2Percent us-gaap:DebtInstrument

wll:DebtInstrumentCommodityHedgesCoveringProductionYear2Percent

wll:CreditAgreement


Debt
Period End2020-09-01
Value35.0
Percentage of DebtInstrumentCommodityHedgesCoveringProductionYear2Percent100.0

wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value35.0
Percentage of DebtInstrumentCommodityHedgesCoveringProductionYear2Percent100.0

wll:DebtLeverageRatio us-gaap:DebtInstrument

wll:DebtLeverageRatio

wll:CreditAgreement


Debt
Period End2020-09-01
Value2.0
Percentage of DebtLeverageRatio100.0

wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value2.0
Percentage of DebtLeverageRatio100.0

wll:DebtThresholdPercentDividendPaymentsAndDistributions us-gaap:DebtInstrument

wll:DebtThresholdPercentDividendPaymentsAndDistributions

wll:CreditAgreement


Debt
Period End2020-09-01
Value20.0
Percentage of DebtThresholdPercentDividendPaymentsAndDistributions100.0

wll:ExitCreditAgreement


Debt
Period End2020-09-01
Value20.0
Percentage of DebtThresholdPercentDividendPaymentsAndDistributions100.0

wll:DeferredTaxAssetsLeaseObligation

wll:DeferredTaxAssetsLeaseObligation


Deferred
Period End2020-12-312019-12-31
Value9.40914
Percentage of DeferredTaxAssetsLeaseObligation100.0100.0

wll:DeferredTaxLiabilitiesTrustDistributions

wll:DeferredTaxLiabilitiesTrustDistributions


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value6.061101554941011291491653618
Percentage of DeferredTaxLiabilitiesTrustDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wll:FinanceLeaseRightOfUseAssetAccumulatedDepreciation

wll:FinanceLeaseRightOfUseAssetAccumulatedDepreciation


Finance
Period End2020-12-312019-12-31
Value1.79714
Percentage of FinanceLeaseRightOfUseAssetAccumulatedDepreciation100.0100.0

wll:FinanceLeaseRightOfUseAssetGross

wll:FinanceLeaseRightOfUseAssetGross


Finance
Period End2020-12-312019-12-31
Value1933
Percentage of FinanceLeaseRightOfUseAssetGross100.0100.0

wll:FreshStartAdjustmentIncreaseDecreaseAccumulatedDepreciationAndAmortizationFinanceLease us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseAccumulatedDepreciationAndAmortizationFinanceLease

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value15
Percentage of FreshStartAdjustmentIncreaseDecreaseAccumulatedDepreciationAndAmortizationFinanceLease100.0

wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseAccruedInterest us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseAccruedInterest

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value127000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseFinanceLeaseAccruedInterest100.0

wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseAssets us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseAssets

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value10
Percentage of FreshStartAdjustmentIncreaseDecreaseFinanceLeaseAssets100.0

wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseLiabilitiesCurrent us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseLiabilitiesCurrent

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value-576000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseFinanceLeaseLiabilitiesCurrent100.0

wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseLiabilitiesNoncurrent us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseFinanceLeaseLiabilitiesNoncurrent

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value-1174000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseFinanceLeaseLiabilitiesNoncurrent100.0

wll:FreshStartAdjustmentIncreaseDecreaseLandAndBuilding us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseLandAndBuilding

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value-16000000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseLandAndBuilding100.0

wll:FreshStartAdjustmentIncreaseDecreaseLeaseAssetsAndLiabilities us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseLeaseAssetsAndLiabilities

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value1444000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseLeaseAssetsAndLiabilities100.0

wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseAssetsNet us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseAssetsNet

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value1480000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseOperatingLeaseAssetsNet100.0

wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseLiabilitiesCurrent us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseLiabilitiesCurrent

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value319000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseOperatingLeaseLiabilitiesCurrent100.0

wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseLiabilitiesNoncurrent us-gaap:StatementScenario

wll:FreshStartAdjustmentIncreaseDecreaseOperatingLeaseLiabilitiesNoncurrent

wll:FreshStartAccountingAdjustments


Fresh
Period End2020-09-01
Value-187000.0
Percentage of FreshStartAdjustmentIncreaseDecreaseOperatingLeaseLiabilitiesNoncurrent100.0

wll:LiabilitiesNotSubjectToCompromise

wll:LiabilitiesNotSubjectToCompromise


Liabilities
Period End2020-09-012020-08-312020-06-302019-12-31
Value953147313603611
Percentage of LiabilitiesNotSubjectToCompromise100.0100.0100.0100.0

wll:LiabilitiesNotSubjectToCompromise us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Liabilities
Period End2020-09-01
Value-91.855
Percentage of LiabilitiesNotSubjectToCompromise-9.6

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value-427.635
Percentage of LiabilitiesNotSubjectToCompromise-44.8

wll:LiabilitiesSubjectToCompromiseAccountsPayable us-gaap:StatementScenario

wll:LiabilitiesSubjectToCompromiseAccountsPayable

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value10
Percentage of LiabilitiesSubjectToCompromiseAccountsPayable100.0

wll:LiabilitiesSubjectToCompromiseAccruedInterestOnDebt us-gaap:StatementScenario

wll:LiabilitiesSubjectToCompromiseAccruedInterestOnDebt

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value105000.0
Percentage of LiabilitiesSubjectToCompromiseAccruedInterestOnDebt100.0

wll:LiabilitiesSubjectToCompromiseAccruedLeaseOperatingExpenses us-gaap:StatementScenario

wll:LiabilitiesSubjectToCompromiseAccruedLeaseOperatingExpenses

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value1394000.0
Percentage of LiabilitiesSubjectToCompromiseAccruedLeaseOperatingExpenses100.0

wll:LiabilitiesSubjectToCompromiseAccruedLiabilities us-gaap:StatementScenario

wll:LiabilitiesSubjectToCompromiseAccruedLiabilities

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value1305000.0
Percentage of LiabilitiesSubjectToCompromiseAccruedLiabilities100.0

wll:LiabilitiesSubjectToCompromiseAccruedLiabilitiesAndOther us-gaap:StatementScenario

wll:LiabilitiesSubjectToCompromiseAccruedLiabilitiesAndOther

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value13
Percentage of LiabilitiesSubjectToCompromiseAccruedLiabilitiesAndOther100.0

wll:LiabilitiesSubjectToCompromiseLiabilitiesReinstated us-gaap:StatementScenario

wll:LiabilitiesSubjectToCompromiseLiabilitiesReinstated

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value56
Percentage of LiabilitiesSubjectToCompromiseLiabilitiesReinstated100.0

wll:LiabilitiesSubjectToCompromiseOpeatingLeaseObligations us-gaap:StatementScenario

wll:LiabilitiesSubjectToCompromiseOpeatingLeaseObligations

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value17
Percentage of LiabilitiesSubjectToCompromiseOpeatingLeaseObligations100.0

wll:LiabilitiesSubjectToCompromiseOperatingLeaseObligations us-gaap:StatementScenario

wll:LiabilitiesSubjectToCompromiseOperatingLeaseObligations

wll:ReorganizationAdjustments


Liabilities
Period End2020-09-01
Value17
Percentage of LiabilitiesSubjectToCompromiseOperatingLeaseObligations100.0

wll:LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity us-gaap:DebtInstrument

wll:LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity

wll:CreditAgreement


Line
Period End2020-09-01
Value750
Percentage of LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity100.0

wll:ExitCreditAgreement


Line
Period End2020-09-01
Value750
Percentage of LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity100.0

wll:LineOfCreditFacilityMaximumAggregateCommitments us-gaap:DebtInstrument

wll:LineOfCreditFacilityMaximumAggregateCommitments

us-gaap:LineOfCredit


Line
Period End2020-08-31
Value1750
Percentage of LineOfCreditFacilityMaximumAggregateCommitments100.0

wll:OilAndGasAccruedLeaseOperatingExpensesCurrent

wll:OilAndGasAccruedLeaseOperatingExpensesCurrent


Oil
Period End2021-06-302021-03-312020-12-312020-09-302020-09-012020-08-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value2820232326252833384740453736
Percentage of OilAndGasAccruedLeaseOperatingExpensesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wll:OilAndGasAccruedLeaseOperatingExpensesCurrent us-gaap:StatementScenario

wll:ReorganizationAdjustments


Oil
Period End2020-09-01
Value1.394
Percentage of OilAndGasAccruedLeaseOperatingExpensesCurrent5.2

wll:OperatingLeaseRightOfUseAssetAccumulatedDepreciation

wll:OperatingLeaseRightOfUseAssetAccumulatedDepreciation


Operating
Period End2020-12-312019-12-31
Value1096000.04895000.0
Percentage of OperatingLeaseRightOfUseAssetAccumulatedDepreciation100.0100.0

wll:OperatingLeaseRightOfUseAssetGross

wll:OperatingLeaseRightOfUseAssetGross


Operating
Period End2020-12-312019-12-31
Value2131
Percentage of OperatingLeaseRightOfUseAssetGross100.0100.0

wll:OperatingLossCarryforwardsExpirationAmount

wll:OperatingLossCarryforwardsExpirationAmount


Operating
Period End2020-12-31
Value2300
Percentage of OperatingLossCarryforwardsExpirationAmount100.0

wll:ProductiveWellNumberOfWellsNet us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

wll:ProductiveWellNumberOfWellsNet

wll:WillistonBasin, us-gaap:SubsequentEvent


Productive
Period End2021-07-19
Value50.2
Percentage of ProductiveWellNumberOfWellsNet100.0

wll:StockholdersEquityAdjustedBalance

wll:StockholdersEquityAdjustedBalance


Stockholders
Period End2020-09-01
Value1189
Percentage of StockholdersEquityAdjustedBalance100.0

wll:StockholdersEquityAdjustedBalance dei:LegalEntity

wll:SuccessorBankruptcy


Stockholders
Period End2020-09-30
Value1189
Percentage of StockholdersEquityAdjustedBalance0.0

wll:StockholdersEquityAdjustedBalance dei:LegalEntity, us-gaap:StatementEquityComponents

wll:SuccessorBankruptcy, us-gaap:AdditionalPaidInCapital


Stockholders
Period End2020-09-30
Value1189
Percentage of StockholdersEquityAdjustedBalance0.0

wll:SuccessorBankruptcy, us-gaap:CommonStock


Stockholders
Period End2020-09-30
Value0.038
Percentage of StockholdersEquityAdjustedBalance0.0

wll:StockholdersEquityAdjustedBalance us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2020-09-01
Value1189
Percentage of StockholdersEquityAdjustedBalance100.0

us-gaap:CommonStock


Stockholders
Period End2020-09-01
Value0.038
Percentage of StockholdersEquityAdjustedBalance0.0

wll:WeightedAverageCostOfCapitalRate

wll:WeightedAverageCostOfCapitalRate


Weighted
Period End2020-09-01
Value14.0
Percentage of WeightedAverageCostOfCapitalRate100.0

wll:WeightedAverageCostOfCapitalRate us-gaap:StatementScenario

wll:FreshStartAccountingAdjustments


Weighted
Period End2020-09-01
Value14.0
Percentage of WeightedAverageCostOfCapitalRate100.0

Line plots across dimensions of each concept


TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
(None,)
Stockholders Equity Including Portion Attributable To Noncontrolling Interestus-gaap: Statement Equity Components
us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents
(None,)
Stock Issued During Period Value New Issuesus-gaap: Statement Equity Components
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument
(None,)
Debt Instrument Interest Rate Stated Percentageus-gaap: Debt Instrument