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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings $ (8) $ 36 $ (66) $ 54
Gains / (losses) recognized in OCI 9 29 (57) 3
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings (2) 38 3 84
Gains / (losses) recognized in OCI 2 (24) (10) 25
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings (6) (2) (9) (4)
Gains / (losses) recognized in OCI 14 15 9 (23)
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings     (60) (26)
Gains / (losses) recognized in OCI $ (7) $ 38 $ (56) $ 1