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Income Taxes (Income Taxes And Related Effective Tax Rates) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income (loss) before income taxes	$ 215	$ 21
Provision (benefit) for income taxes	$ 51	$ 11
Effective tax rate	23.70%	52.40%

- 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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