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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings $ 13 $ 2 $ 10 $ (64)
Gains / (losses) recognized in OCI (6) 4 21 (53)
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings (3) (6) (2) (3)
Gains / (losses) recognized in OCI (11) (11) (37) (21)
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings 16 8 12 (1)
Gains / (losses) recognized in OCI 25 10 31 19
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings       (60)
Gains / (losses) recognized in OCI $ (20) $ 5 $ 27 $ (51)