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Effects of Cash Flow Hedges (Detail) (Cash Flow Hedges, USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings $ 17 $ (6) $ 20 $ (38)
Gains / (losses) recognized in OCI 47 4 (23) 82
Currency exchange contracts | Forecasted transactions
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings 12 (6) 8 (18)
Gains / (losses) recognized in OCI 58 (16) 65 (12)
Commodity contracts
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings 5   14 (19)
Gains / (losses) recognized in OCI 7 7 10 (1)
Interest rate contracts
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings     (2) (1)
Gains / (losses) recognized in OCI $ (18) $ 13 $ (98) $ 95