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Effects of Cash Flow Hedges (Detail) (Cash Flow Hedges, USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings $ 2 $ (15) $ 3 $ (32)
Gains / (losses) recognized in OCI (36) 57 (70) 78
Currency exchange contracts | Forecasted transactions
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings (2) (4) (4) (12)
Gains / (losses) recognized in OCI 5 (2) 7 4
Commodity contracts
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings 4 (10) 9 (19)
Gains / (losses) recognized in OCI (8) (4) 3 (8)
Interest rate contracts
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) reclassified from AOCI into earnings   (1) (2) (1)
Gains / (losses) recognized in OCI $ (33) $ 63 $ (80) $ 82