CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ (3,720)us-gaap_ProfitLoss	$ 466us-gaap_ProfitLoss
ADJUSTMENTS TO RECONCILE NET INCOME (LOSS) TO CASH PROVIDED BY OPERATING ACTIVITIES:
Depreciation, depletion and amortization	719	706
Deferred income tax expense (benefit)	(1,372)us-gaap_DeferredIncomeTaxExpenseBenefit	277us-gaap_DeferredIncomeTaxExpenseBenefit
Derivative (gains) losses, net	(172)	363
Cash receipts (payments) on derivative settlements, net	408us-gaap_DerivativeCashReceivedOnHedge	(157)us-gaap_DerivativeCashReceivedOnHedge
Stock-based compensation	23us-gaap_ShareBasedCompensation	20us-gaap_ShareBasedCompensation
Impairment of oil and natural gas properties	4,976us-gaap_ImpairmentOfOilAndGasProperties	0us-gaap_ImpairmentOfOilAndGasProperties
Net (gains) losses on sales of fixed assets	3	(23)
Impairments of fixed assets and other	2	12
Losses on investments	7	21
Net gains on sales of investments	0us-gaap_GainLossOnSaleOfInvestments	(67)us-gaap_GainLossOnSaleOfInvestments
Restructuring and other termination costs	(10)us-gaap_RestructuringCosts	(9)us-gaap_RestructuringCosts
Provision for legal contingencies	25us-gaap_LossContingencyAccrualProvision	0us-gaap_LossContingencyAccrualProvision
Other	21us-gaap_OtherNoncashIncomeExpense	5us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities	(487)	(323)
Net Cash Provided By Operating Activities	423	1,291
CASH FLOWS FROM INVESTING ACTIVITIES:
Drilling and completion costs	(1,306)	(897)
Acquisitions of proved and unproved properties	(128)	(187)
Proceeds from divestitures of proved and unproved properties	21	49
Additions to other property and equipment	(58)	(437)
Proceeds from sales of other property and equipment	2	239
Additions to investments	(3)	(3)
Proceeds from sales of investments	0	239
Other	0	(2)
Net Cash Used In Investing Activities	(1,472)	(999)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facilities borrowings	0us-gaap_ProceedsFromLinesOfCredit	421us-gaap_ProceedsFromLinesOfCredit
Payments on credit facilities borrowings	0us-gaap_RepaymentsOfLinesOfCredit	(362)us-gaap_RepaymentsOfLinesOfCredit
Cash paid for common stock dividends	(59)us-gaap_PaymentsOfDividendsCommonStock	(58)us-gaap_PaymentsOfDividendsCommonStock
Cash paid for preferred stock dividends	(43)	(43)
Cash paid on financing derivatives	0	(15)
Distributions to noncontrolling interest owners	(29)	(53)
Other	(21)	(15)
Net Cash Used In Financing Activities	(152)	(125)
Net increase (decrease) in cash and cash equivalents	(1,201)	167
Cash and cash equivalents, beginning of period	4,108	837
Cash and cash equivalents, end of period	2,907	1,004
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of capitalized interest	43us-gaap_InterestPaidNet	75us-gaap_InterestPaidNet
Income taxes paid, net of refunds received	47us-gaap_IncomeTaxesPaidNet	0us-gaap_IncomeTaxesPaidNet
SUPPLEMENTAL DISCLOSURE OF SIGNIFICANT NON-CASH INVESTING AND FINANCING ACTIVITIES:
Change in accrued drilling and completion costs	63	(168)
Change in accrued acquisitions of proved and unproved properties	16	7
Change in accrued additions to other property and equipment	$ 0	$ (2)

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Other Property, Plant and Equipment Adjusted as Result of Change in Accrued Costs

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the aggregate amount of accrued expenses and other operating obligations not separately disclosed in the statement of cash flows.

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The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The net cash outflow or inflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

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The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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- Definition

The cash inflow from the sale of other tangible or intangible assets used to produce goods or deliver services not otherwise defined in the taxonomy.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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