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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings $ (60) $ 17 $ (6) $ 20
Gains / (losses) recognized in OCI (69) 47 (66) (23)
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings (11) 12 73 8
Gains / (losses) recognized in OCI 8 58 33 65
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings (49) 5 (53) 14
Gains / (losses) recognized in OCI (38) 7 (61) 10
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings     (26) (2)
Gains / (losses) recognized in OCI $ (39) $ (18) $ (38) $ (98)