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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal statutory rate	35.00%	35.00%	35.00%
Unrecognized tax positions that would impact the effective tax rate	$ 240	$ 220	$ 253
Unrecognized tax positions as a component of income taxes expense, accrued interest	39
Unrecognized tax positions as a component of income taxes expenses, recognized in interest	(8)	(2)	(6)
Federal, state and foreign net operating loss carryforwards	723
Federal, state and foreign net operating loss carryforwards, expiration date	Through 2032
Base year reserves included in retained earnings	$ 102

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