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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) reclassified from AOCI into earnings $ (7) $ (58)
Gains / (losses) recognized in OCI 11 (66)
Currency exchange contracts | Forecasted transactions    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) reclassified from AOCI into earnings   5
Gains / (losses) recognized in OCI (6) (12)
Commodity contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) reclassified from AOCI into earnings (7) (3)
Gains / (losses) recognized in OCI (1) (5)
Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) reclassified from AOCI into earnings   (60)
Gains / (losses) recognized in OCI $ 18 $ (49)