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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Taxes [Abstract]
Liability for unrecognized tax benefits	$ 519		$ 519		$ 494
Unrecognized tax benefits, accrued interest	47		47		62
Unrecognized tax benefits that would affect effective rate	158		158		173
Reductions in interest related to taxing authority examinations	1	66	20	92
Reductions in interest related to taxing authority examinations, net of tax	$ 0	$ 42	$ 13	$ 58

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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