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Income Taxes (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	Feb. 28, 2010
Income Taxes
Provision for income taxes	$ 91	$ 25	$ 144	$ 73
Effective income tax rate	21.80%	10.00%	20.40%	14.90%
Liability for taxes, penalties and interest					$ 892

- 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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