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Tax - Difference Between Effective Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Federal income tax at U.S. federal statutory rate	$ 253	$ 306
Foreign income tax rate differential	(57)	(23)
State income tax, net of federal benefit	8	8
Nondeductible expenses	8	13
Tax benefit of manufacturing deduction	(8)	(9)
Foreign dividends, net of foreign tax credits	4	6
Tax impact of foreign exchange	18	(30)
Other	(2)	(2)
Provision for income taxes	$ 224	$ 269

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