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Tax - Difference Between Effective Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Federal income tax at U.S. federal statutory rate	$ 297	$ 253
Foreign income tax rate differential	(47)	(57)
State income tax, net of federal benefit	6	8
Nondeductible expenses	11	8
Tax benefit of manufacturing deduction	(8)	(8)
Foreign dividends, net of foreign tax credits	9	4
Tax impact of foreign exchange	(8)	18
Other		(2)
Provision for income taxes	$ 260	$ 224

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