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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Income Taxes [Line Items]
Federal statutory rate			35.00%
Provision for income taxes	$ 109	$ 49	$ 151	$ 138
Cash paid for income taxes (net of refunds)	20	(1)	39	6	66	35
Tax contingencies, gross unrecognized tax benefits	250		250		250		229
Business Acquisition
Income Taxes [Line Items]
Provision for income taxes	$ 51

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 amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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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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