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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) reclassified from AOCI into earnings $ (58) $ 18
Gains / (losses) recognized in OCI (66) (26)
Currency exchange contracts | Forecasted transactions    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) reclassified from AOCI into earnings 5 46
Gains / (losses) recognized in OCI (12) 49
Commodity contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) reclassified from AOCI into earnings (3) (2)
Gains / (losses) recognized in OCI (5) (38)
Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) reclassified from AOCI into earnings (60) (26)
Gains / (losses) recognized in OCI $ (49) $ (37)