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Income Taxes - Summary of Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Schedule Of Income Taxes [Line Items]
Income tax provision	$ 1	$ 18	$ 0
Income (Loss) before Income Taxes	$ (44)	$ 104
Effective tax rate	(2.00%)	17.00%

- 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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