Income Taxes (Components of Income Tax Expense) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current income tax expense
U.S. federal	$ 332	$ 193	$ 62
Non-U.S.	203	176	170
U.S. State and local	28	20	15
Total current income tax	563	389	247
Deferred income tax expense
U.S. federal	(162)	11	70
Non-U.S.	(48)	(17)	2
U.S. State and local	(15)	2	11
One-time charge, tax law change			85
Total deferred income tax	(225)	(4)	168
Total	$ 338	$ 385	$ 415