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Income Taxes- Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax reserves	$ 1,050		$ 340
Impact on tax expense if tax reserves were unnecessary	1,050
Accrued interest, related to income taxes in the balance sheet	323
Additional tax expense related to interest	289	3
Tax charge to be during the first quarter of 2013 due to adverse decision from the U.S. Tax Court	854
Reasonably possible decrease in uncertain tax positions within the next 12 months, if a re-evaluation is required	$ 72

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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- Definition

This element represents interest expense recognized 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.

+ References+ Details