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Tax - Difference Between Effective Tax Rate (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Federal income tax at U.S. federal statutory rate $ (83) $ 176
Foreign income tax rate differential (27) (46)
State income tax, net of federal benefit (4) 4
Nondeductible expenses 12 5
Tax benefit of manufacturing deduction   (10)
Foreign dividends, net of foreign tax credits 5 7
Tax impact of foreign exchange (8) 1
Change in valuation allowance 10  
Tax rate change on temporary differences 2 (4)
Change in tax reserves (25) 69
Other   (13)
Provision for income taxes $ (118) $ 189