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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings $ 36 $ 2 $ 54 $ 3
Gains / (losses) recognized in OCI 29 (36) 3 (70)
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings 38 (2) 84 (4)
Gains / (losses) recognized in OCI (24) 5 25 7
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings (2) 4 (4) 9
Gains / (losses) recognized in OCI 15 (8) (23) 3
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings     (26) (2)
Gains / (losses) recognized in OCI $ 38 $ (33) $ 1 $ (80)