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Tax - Difference Between Effective Tax Rate (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Federal income tax at U.S. federal statutory rate $ 67 $ 344 $ 380 $ 932
Foreign income tax rate differential (30) (91) (117) (189)
State income tax, net of federal benefit   8 3 23
Nondeductible expenses   1 17 20
Tax benefit of manufacturing deduction 7 (13) (3) (31)
Foreign dividends, net of foreign tax credits (1) 113 14 134
Tax impact of foreign exchange (4) 16 (22) 14
Change in valuation allowance   (94)   (92)
Change in tax reserves (2)   67  
Other (1) (1) (9) (5)
Provision for income taxes $ 36 $ 283 $ 330 $ 806