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Tax - Difference Between Effective Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Federal income tax at U.S. federal statutory rate	$ 322	$ 306	$ 845	$ 922
Foreign income tax rate differential	(50)	(29)	(172)	(109)
State income tax, net of federal benefit	5	7	17	24
Nondeductible expenses	4		20	23
Tax benefit of manufacturing deduction	(4)	(12)	(20)	(30)
Foreign dividends, net of foreign tax credits	12	2	24	22
Tax impact of foreign exchange	(12)	(15)	27	(33)
Tax rate change on temporary differences	(16)		(16)
Change in valuation allowance	32	2	40	4
Other	(10)	4	(19)	(4)
Provision for income taxes	$ 283	$ 265	$ 746	$ 819

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