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Tax - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Federal income tax at U.S. federal statutory rate	$ (436)	$ 67	$ (637)	$ 380
Foreign income tax rate differential	38	(30)	14	(117)
Nondeductible expenses	2		23	17
Foreign dividends, net of foreign tax credits	(28)	(1)	(47)	14
Tax impact of foreign exchange	9	(4)	2	(22)
Change in valuation allowance	238		259
Goodwill impairment	273		273
Tax rate change on temporary differences	(2)	1	(5)	(2)
Change in tax reserves	39	(2)	19	67
Other	(13)	5	(20)	(7)
Provision for income taxes	$ 120	$ 36	$ (119)	$ 330

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