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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Taxes [Line Items]
Income tax expense	$ 37	$ 31
U.S. federal income tax rate	35.00%	35.00%
Recognized tax benefit related to future income taxes and non-us withholding taxes	2	1
Reasonably Possible to be Released in Twelve Month
Income Taxes [Line Items]
Deferred tax asset valuation allowance	$ 33

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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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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