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Consolidated Statements of Operations (unaudited) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues    
Oil, Gas and NGL Sales $ 740us-gaap_OilAndGasSalesRevenue $ 1,327us-gaap_OilAndGasSalesRevenue
Income from Equity Method Investees 18us-gaap_IncomeLossFromEquityMethodInvestments 52us-gaap_IncomeLossFromEquityMethodInvestments
Other 1us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue 0us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
Total 759us-gaap_Revenues 1,379us-gaap_Revenues
Costs and Expenses    
Production Expense 245us-gaap_ResultsOfOperationsProductionOrLiftingCosts 229us-gaap_ResultsOfOperationsProductionOrLiftingCosts
Exploration Expense 65us-gaap_ExplorationExpense 74us-gaap_ExplorationExpense
Depreciation, Depletion and Amortization 454us-gaap_DepreciationDepletionAndAmortization 425us-gaap_DepreciationDepletionAndAmortization
General and Administrative 94us-gaap_GeneralAndAdministrativeExpense 140us-gaap_GeneralAndAdministrativeExpense
Asset Impairments 27us-gaap_ImpairmentOfOilAndGasProperties 97us-gaap_ImpairmentOfOilAndGasProperties
Other Operating Expense, Net 8us-gaap_OtherCostAndExpenseOperating 10us-gaap_OtherCostAndExpenseOperating
Total 893us-gaap_OperatingExpenses 975us-gaap_OperatingExpenses
Operating Income (Loss) (134)us-gaap_OperatingIncomeLoss 404us-gaap_OperatingIncomeLoss
Other (Income) Expense    
(Gain) Loss on Commodity Derivative Instruments (150)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet 75us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Interest, Net of Amount Capitalized 57us-gaap_InterestExpense 47us-gaap_InterestExpense
Other Non-Operating (Income) Expense, Net 1us-gaap_OtherNonoperatingIncomeExpense 5us-gaap_OtherNonoperatingIncomeExpense
Total (92)us-gaap_NonoperatingIncomeExpense 127us-gaap_NonoperatingIncomeExpense
Income (Loss) Before Income Taxes (42)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 277us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Tax (Benefit) Provision (20)us-gaap_IncomeTaxExpenseBenefit 77us-gaap_IncomeTaxExpenseBenefit
Net Income (Loss) $ (22)us-gaap_NetIncomeLoss $ 200us-gaap_NetIncomeLoss
Earnings Per Share, Basic [Abstract]    
Net Income (in dollars per share) $ (0.06)us-gaap_EarningsPerShareBasic $ 0.56us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted [Abstract]    
Net Income (in dollars per share) $ (0.06)us-gaap_EarningsPerShareDiluted $ 0.55us-gaap_EarningsPerShareDiluted
Weighted Average Number of Shares Outstanding [Abstract]    
Weighted Average Number of Shares Outstanding, Basic (in shares) 370us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 360us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1]
Weighted Average Number of Shares Outstanding, Diluted (in shares) 370us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 365us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] The weighted average number of shares outstanding includes the weighted average shares of common stock issued in connection with the underwritten public offering of 24,150,000 shares of common stock of the Company in first quarter 2015.