Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Oil, Gas and NGL Sales	$ 4,931us-gaap_OilAndGasSalesRevenue	$ 4,809us-gaap_OilAndGasSalesRevenue	$ 4,037us-gaap_OilAndGasSalesRevenue
Income from Equity Method Investees	170	206	186
Total Revenues	5,101us-gaap_Revenues	5,015us-gaap_Revenues	4,223us-gaap_Revenues
Costs and Expenses
Production Expense	958	850	673
Exploration Expense	498us-gaap_ExplorationExpense	415us-gaap_ExplorationExpense	409us-gaap_ExplorationExpense
Depreciation, Depletion and Amortization	1,759	1,568	1,370
General and Administrative	503us-gaap_GeneralAndAdministrativeExpense	433us-gaap_GeneralAndAdministrativeExpense	384us-gaap_GeneralAndAdministrativeExpense
Gain on Divestitures	(73)	(36)	(154)
Asset Impairments	500us-gaap_ImpairmentOfOilAndGasProperties	86us-gaap_ImpairmentOfOilAndGasProperties	104us-gaap_ImpairmentOfOilAndGasProperties
Other Operating (Income) Expense, Net	38us-gaap_OtherCostAndExpenseOperating	43us-gaap_OtherCostAndExpenseOperating	25us-gaap_OtherCostAndExpenseOperating
Total Operating Expenses	4,183us-gaap_OperatingExpenses	3,359us-gaap_OperatingExpenses	2,811us-gaap_OperatingExpenses
Operating Income	918us-gaap_OperatingIncomeLoss	1,656us-gaap_OperatingIncomeLoss	1,412us-gaap_OperatingIncomeLoss
Other (Income) Expense
(Gain) Loss on Commodity Derivative Instruments	(976)	133	(75)
Interest, Net of Amount Capitalized	210us-gaap_InterestExpense	158us-gaap_InterestExpense	125us-gaap_InterestExpense
Other Non-Operating (Income) Expense, Net	(26)us-gaap_OtherNonoperatingIncomeExpense	21us-gaap_OtherNonoperatingIncomeExpense	6us-gaap_OtherNonoperatingIncomeExpense
Total Other (Income) Expense	(792)us-gaap_NonoperatingIncomeExpense	312us-gaap_NonoperatingIncomeExpense	56us-gaap_NonoperatingIncomeExpense
Income from Continuing Operations Before Income Taxes	1,710	1,344	1,356
Income Tax Provision	496us-gaap_IncomeTaxExpenseBenefit	437us-gaap_IncomeTaxExpenseBenefit	391us-gaap_IncomeTaxExpenseBenefit
Income from Continuing Operations	1,214	907	965
Discontinued Operations, Net of Tax	0	71	62
Net Income	$ 1,214us-gaap_NetIncomeLoss	$ 978us-gaap_NetIncomeLoss	$ 1,027us-gaap_NetIncomeLoss
Earnings Per Share, Basic
Income from Continuing Operations (in dollars per share)	$ 3.36	$ 2.53	$ 2.71
Discontinued Operations, Net of Tax (in dollars per share)	$ 0.00	$ 0.19	$ 0.18
Net Income (in dollars per share)	$ 3.36us-gaap_EarningsPerShareBasic	$ 2.72us-gaap_EarningsPerShareBasic	$ 2.89us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted
Income from Continuing Operations (in dollars per share)	$ 3.27	$ 2.50	$ 2.68
Discontinued Operations, Net of Tax (in dollars per share)	$ 0.00	$ 0.19	$ 0.18
Net Income (in dollars per share)	$ 3.27us-gaap_EarningsPerShareDiluted	$ 2.69us-gaap_EarningsPerShareDiluted	$ 2.86us-gaap_EarningsPerShareDiluted
Weighted Average Number of Shares Outstanding, Basic (in shares)	361	359	356
Weighted Average Number of Shares Outstanding, Diluted (in shares)	367	363	359

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Revenue from the sale of oil and gas during the period.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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