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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 M
Effective tax rate	61.00%
State income tax benefit	$ 21
Time limits for tax audit closings, settlements and expiration of applicable statutes of limitations in various jurisdictions	12
Anticipation of the reasonably possible change in uncertain tax positions	$ 3

- 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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