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Tax - Difference Between Effective Tax Rate (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Federal income tax at U.S. federal statutory rate $ 137 $ 312 $ 313 $ 588
Foreign income tax rate differential (41) (51) (87) (98)
State income tax, net of federal benefit   9 3 15
Nondeductible expenses 12 8 17 19
Tax benefit of manufacturing deduction   (10) (10) (17)
Foreign dividends, net of foreign tax credits 8 12 15 21
Tax impact of foreign exchange (19) 6 (18) (2)
Change in tax reserves     69  
Other 8 (2) (8) (3)
Provision for income taxes $ 105 $ 284 $ 294 $ 523