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Income Taxes Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 97	$ (101)	$ 217	$ (131)
Income before income tax expense (benefit)	173	360	988	431
Effective income tax rate	56.10%	(28.10%)	22.00%	(30.40%)
Federal stautory income tax rate			35.00%
Valuation Allowance, Deferred Tax Asset, Change in Amount				$ 159

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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