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Income Taxes (Income Taxes And Related Effective Tax Rates) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Taxes
Pre-tax income (loss)	$ (147)	$ 1,968	$ (1,910)	$ (291)
Provision (benefit) for income taxes	$ (284)	$ 673	$ (772)	$ (106)
Related effective tax rate	193.20%	34.20%	40.40%	36.40%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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