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Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Noncontrolling interests	$ 260		$ 259
Net income attributable to noncontrolling interests	0	$ 19
VIE, Cash and cash equivalents	16	2,907	825	$ 4,108
VIE. proved natural gas and oil properties	64,305		63,843
VIE. accumulated depreciation, depletion and amortization	(60,506)		(59,365)
VIE. other current liabilities	1,544		2,219
Proceeds from sales ro KKR	62	21
Loss on sale of investment	(10)	0
Mineral Acquisition Company I, L.P. [Member]
Variable Interest Entity [Line Items]
VIE, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net			10
Proceeds from sales ro KKR	9
Loss on sale of investment	(10)
Noncontrolling Interest, Chesapeake Granite Wash Trust [Member]
Variable Interest Entity [Line Items]
Noncontrolling interests	260	259
Net income attributable to noncontrolling interests	0	$ 1
Variable Interest Entities, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
VIE, Cash and cash equivalents	1		1
VIE. proved natural gas and oil properties	488		488
VIE. accumulated depreciation, depletion and amortization	(445)		(428)
VIE. other current liabilities	$ 2		$ 8

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

+ References

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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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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Net carrying amount of the assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), when the reporting entity is not the VIE's primary beneficiary.

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