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Consolidated Statements of Cash Flows (unaudited) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Flows From Operating Activities    
Net Income (Loss) $ (22)us-gaap_NetIncomeLoss $ 200us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities    
Depreciation, Depletion and Amortization 454nbl_DepreciationDepletionAndAmortizationIncludingDiscontinuedOperations 425nbl_DepreciationDepletionAndAmortizationIncludingDiscontinuedOperations
Asset Impairments 27us-gaap_ImpairmentOfOilAndGasProperties 97us-gaap_ImpairmentOfOilAndGasProperties
Dry Hole Cost 20us-gaap_ExplorationAbandonmentAndImpairmentExpense 2us-gaap_ExplorationAbandonmentAndImpairmentExpense
Deferred Income Taxes (30)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 17us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Income from Equity Method Investees, Net of Dividends (18)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions (13)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
(Gain) Loss on Commodity Derivative Instruments (150)us-gaap_GainLossOnDerivativeInstrumentsNetPretax 75us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Net Cash Received (Paid) in Settlement of Commodity Derivative Instruments 210nbl_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments (33)nbl_CashReceivedPaidInSettlementOfDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Stock Based Compensation 21us-gaap_ShareBasedCompensation 23us-gaap_ShareBasedCompensation
Other Adjustments for Noncash Items Included in Income 11us-gaap_OtherNoncashIncomeExpense 18us-gaap_OtherNoncashIncomeExpense
Changes in Operating Assets and Liabilities    
Decrease in Accounts Receivable 107us-gaap_IncreaseDecreaseInAccountsReceivable 28us-gaap_IncreaseDecreaseInAccountsReceivable
Increase (Decrease) in Accounts Payable (71)us-gaap_IncreaseDecreaseInAccountsPayable 57us-gaap_IncreaseDecreaseInAccountsPayable
Increase in Current Income Taxes Payable 3us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 47us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Decrease in Other Current Assets and Liabilities, Net (51)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (24)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Other Operating Assets and Liabilities, Net 30us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 10us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net Cash Provided by Operating Activities 541us-gaap_NetCashProvidedByUsedInOperatingActivities 929us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows From Investing Activities    
Additions to Property, Plant and Equipment (1,111)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment (1,158)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment
Additions to Equity Method Investments (44)us-gaap_PaymentsToAcquireEquityMethodInvestments (12)us-gaap_PaymentsToAcquireEquityMethodInvestments
Proceeds from Divestitures 119us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 92us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Net Cash Used in Investing Activities (1,036)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,078)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows From Financing Activities    
Exercise of Stock Options 4us-gaap_ProceedsFromStockOptionsExercised 10us-gaap_ProceedsFromStockOptionsExercised
Excess Tax Benefits from Stock-Based Awards 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 6us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Dividends Paid, Common Stock (64)us-gaap_PaymentsOfDividendsCommonStock (50)us-gaap_PaymentsOfDividendsCommonStock
Purchase of Treasury Stock (12)us-gaap_PaymentsForRepurchaseOfCommonStock (15)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from Issuance of Shares of Common Stock to Public, Net of Offering Costs 1,112us-gaap_ProceedsFromIssuanceOrSaleOfEquity 0us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Proceeds from Credit Facility, Net 0us-gaap_ProceedsFromLongTermLinesOfCredit 450us-gaap_ProceedsFromLongTermLinesOfCredit
Repayment of Capital Lease Obligation (19)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (15)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Net Cash Provided by Financing Activities 1,021us-gaap_NetCashProvidedByUsedInFinancingActivities 386us-gaap_NetCashProvidedByUsedInFinancingActivities
Increase in Cash and Cash Equivalents 526us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 237us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at Beginning of Period 1,183us-gaap_CashAndCashEquivalentsAtCarryingValue 1,117us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at End of Period $ 1,709us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,354us-gaap_CashAndCashEquivalentsAtCarryingValue