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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows From Operating Activities [Abstract]      
Net Income $ 1,214us-gaap_NetIncomeLoss $ 978us-gaap_NetIncomeLoss $ 1,027us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities [Abstract]      
Depreciation, Depletion and Amortization 1,759nbl_DepreciationDepletionAndAmortizationIncludingDiscontinuedOperations 1,570nbl_DepreciationDepletionAndAmortizationIncludingDiscontinuedOperations 1,403nbl_DepreciationDepletionAndAmortizationIncludingDiscontinuedOperations
Asset Impairments 500us-gaap_ImpairmentOfOilAndGasProperties 86us-gaap_ImpairmentOfOilAndGasProperties 104us-gaap_ImpairmentOfOilAndGasProperties
Dry Hole Cost 226us-gaap_ExplorationAbandonmentAndImpairmentExpense 149us-gaap_ExplorationAbandonmentAndImpairmentExpense 182us-gaap_ExplorationAbandonmentAndImpairmentExpense
Deferred Income Taxes 268us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 269us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 109us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Income from Equity Method Investees, Net of Dividends 33us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions (17)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 7us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
(Gain) Loss on Commodity Derivative Instruments (976)us-gaap_GainLossOnDerivativeInstrumentsNetPretax 133us-gaap_GainLossOnDerivativeInstrumentsNetPretax (75)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Net Cash Received (Paid) in Settlement of Commodity Derivative Instruments 29nbl_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments (2)nbl_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments (34)nbl_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Gain on Divestitures (73)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (93)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (72)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Stock Based Compensation 87us-gaap_ShareBasedCompensation 80us-gaap_ShareBasedCompensation 65us-gaap_ShareBasedCompensation
Other Adjustments for Noncash Items Included in Income 27us-gaap_OtherNoncashIncomeExpense 75us-gaap_OtherNoncashIncomeExpense 83us-gaap_OtherNoncashIncomeExpense
Changes in Operating Assets and Liabilities [Abstract]      
(Increase) Decrease in Accounts Receivable 29us-gaap_IncreaseDecreaseInAccountsReceivable (239)us-gaap_IncreaseDecreaseInAccountsReceivable (130)us-gaap_IncreaseDecreaseInAccountsReceivable
Increase (Decrease) in Accounts Payable 318us-gaap_IncreaseDecreaseInAccountsPayable (87)us-gaap_IncreaseDecreaseInAccountsPayable 237us-gaap_IncreaseDecreaseInAccountsPayable
Increase (Decrease) in Current Income Taxes Payable 18us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (47)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 64us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Increase in Other Current Liabilities 45us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 20us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 18us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Other Operating Assets and Liabilities, Net 2us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 62us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (55)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net Cash Provided by Operating Activities 3,506us-gaap_NetCashProvidedByUsedInOperatingActivities 2,937us-gaap_NetCashProvidedByUsedInOperatingActivities 2,933us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities [Abstract]      
Additions to Property, Plant and Equipment (4,871)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment (3,947)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment (3,650)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment
Proceeds from Divestitures 321us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 327us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 1,160us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Additions to Equity Method Investments (71)us-gaap_PaymentsToAcquireEquityMethodInvestments (48)us-gaap_PaymentsToAcquireEquityMethodInvestments (41)us-gaap_PaymentsToAcquireEquityMethodInvestments
Distributions from Equity Method Investments 156us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
Other 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities (7)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 4us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net Cash Used in Investing Activities (4,465)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,675)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,527)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities [Abstract]      
Exercise of Stock Options 48us-gaap_ProceedsFromStockOptionsExercised 51us-gaap_ProceedsFromStockOptionsExercised 56us-gaap_ProceedsFromStockOptionsExercised
Excess Tax Benefits from Stock-Based Awards 19us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 20us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 25us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Dividends Paid, Common Stock (249)us-gaap_PaymentsOfDividendsCommonStock (198)us-gaap_PaymentsOfDividendsCommonStock (164)us-gaap_PaymentsOfDividendsCommonStock
Purchase of Treasury Stock (16)us-gaap_PaymentsForRepurchaseOfCommonStock (14)us-gaap_PaymentsForRepurchaseOfCommonStock (13)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from Credit Facilities 1,050us-gaap_ProceedsFromLongTermLinesOfCredit 900us-gaap_ProceedsFromLongTermLinesOfCredit 150us-gaap_ProceedsFromLongTermLinesOfCredit
Repayment of Credit Facilities (1,050)us-gaap_RepaymentsOfLongTermLinesOfCredit (900)us-gaap_RepaymentsOfLongTermLinesOfCredit (150)us-gaap_RepaymentsOfLongTermLinesOfCredit
Proceeds from Issuance of Senior Long-Term Debt, Net 1,478us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 985us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Repayment of Senior Notes (200)us-gaap_RepaymentsOfSeniorDebt 0us-gaap_RepaymentsOfSeniorDebt 0us-gaap_RepaymentsOfSeniorDebt
Repayment of Capital Lease Obligation (55)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (48)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (45)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Repayment of Installment Loan 0us-gaap_RepaymentsOfDebt (328)us-gaap_RepaymentsOfDebt (328)us-gaap_RepaymentsOfDebt
Other 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (5)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net Cash Provided By (Used in) Financing Activities 1,025us-gaap_NetCashProvidedByUsedInFinancingActivities 468us-gaap_NetCashProvidedByUsedInFinancingActivities (474)us-gaap_NetCashProvidedByUsedInFinancingActivities
Increase (Decrease) in Cash and Cash Equivalents 66us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (270)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (68)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at Beginning of Period 1,117us-gaap_CashAndCashEquivalentsAtCarryingValue 1,387us-gaap_CashAndCashEquivalentsAtCarryingValue 1,455us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at End of Period $ 1,183us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,117us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,387us-gaap_CashAndCashEquivalentsAtCarryingValue