CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (3,236)us-gaap_ProfitLoss	$ (2,626)us-gaap_ProfitLoss
Adjustments for derivative instruments
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	2	2
Income taxes on reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	(1)	(1)
Total adjustments for derivative instruments, net of taxes	1	1
Adjustments for pension and other postretirement plans
Amortization of net actuarial (gain) loss to general and administrative expense	13	7
Income taxes on amortization of net actuarial (gain) loss to general and administrative expense	(4)	(2)
Total adjustments for pension and other postretirement plans, net of taxes	9	5
Total	10	6
Comprehensive Income (Loss)	(3,226)	(2,620)
Comprehensive income attributable to noncontrolling interests	32	43
Comprehensive Income (Loss) Attributable to Common Stockholders	$ (3,258)us-gaap_ComprehensiveIncomeNetOfTax	$ (2,663)us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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