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Tax - Difference Between Effective Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Federal income tax at U.S. federal statutory rate	$ 312	$ 249	$ 588	$ 482
Foreign income tax rate differential	(51)	(65)	(98)	(122)
State income tax, net of federal benefit	9	4	15	12
Nondeductible expenses	8	8	19	16
Tax benefit of manufacturing deduction	(10)	(8)	(17)	(16)
Foreign dividends, net of foreign tax credits	12	8	21	12
Tax impact of foreign exchange	6	21	(2)	39
Other	(2)	1	(3)
Provision for income taxes	$ 284	$ 218	$ 523	$ 423

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