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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings $ 4 $ (8) $ (3) $ (66)
Gains / (losses) recognized in OCI 16 9 27 (57)
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings 1 (2) 1 3
Gains / (losses) recognized in OCI (14) 2 (26) (10)
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings 3 (6) (4) (9)
Gains / (losses) recognized in OCI 6 14 6 9
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings       (60)
Gains / (losses) recognized in OCI $ 24 $ (7) $ 47 $ (56)