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Income Taxes - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income tax at U.S. statutory rate	$ (918)	$ (206)	$ 1,223
Foreign income tax rate differential	32	(110)	(261)
Goodwill impairment	271	462
Nondeductible expenses	30	66	24
Foreign dividends, net of foreign tax credits	(25)	28	132
Tax rate change on timing differences	(8)	(45)	(2)
Change in tax reserve	11	69	(11)
Prior years taxes	(29)	(47)	(11)
Tax impact on foreign exchange	(4)	(46)	28
Change in deferred tax valuation allowance	476	15	(83)
Other	(43)	(8)
Total income tax provision	$ (207)	$ 178	$ 1,039

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