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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings $ 2 $ (60) $ (64) $ (6)
Gains / (losses) recognized in OCI 4 (69) (53) (66)
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings (6) (11) (3) 73
Gains / (losses) recognized in OCI (11) 8 (21) 33
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings 8 (49) (1) (53)
Gains / (losses) recognized in OCI 10 (38) 19 (61)
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings     (60) (26)
Gains / (losses) recognized in OCI $ 5 $ (39) $ (51) $ (38)