Comprehensive (Loss)/Income (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Components of comprehensive (loss)/income, net of tax
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (55)	$ 223	$ 306	$ 491
Changes in derivative activity	(76)	59	(225)	162
Foreign currency translation adjustment	(27)	36	(5)	(6)
Unrealized loss on available-for-sale securities	(1)	0	(1)	(1)
Other comprehensive (loss)/income	(104)	95	(231)	155
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0	0	(1)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(159)	318	75	647
Summary of changes in the Company's accumulated other comprehensive income, or OCI, net of tax
Accumulated other comprehensive income at the beginning of the period			432
Changes in derivative activity	(76)	59	(225)	162
Foreign currency translation adjustment	(27)	36	(5)	(6)
Unrealized loss on available-for-sale securities	(1)	0	(1)	(1)
Accumulated other comprehensive income at the end of the period	$ 201		$ 201

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.

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