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Income Taxes - Difference Between Effective Tax Rate (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Federal income tax at U.S. statutory rate $ (206) $ 1,223 $ 1,093
Foreign income tax rate differential (110) (261) (216)
State income tax, net of federal benefit (4) 25 27
Nondeductible expenses 528 24 26
Tax benefit of manufacturing deduction (1) (37) (33)
Foreign dividends, net of foreign tax credits 28 132 32
Tax rate change on timing differences (45) (2) (22)
Change in tax reserve 69 (11) (1)
Prior years taxes (47) (11) (40)
Foreign exchange losses (46) 28 25
Change in deferred tax valuation allowance 15 (83) 40
Other (3) 12 12
Total income tax provision $ 178 $ 1,039 $ 943