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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Gains / (losses) reclassified from AOCI into earnings   $ 40 $ (53)
Gains / (losses) recognized in OCI $ (43) (79) 102
Currency exchange contracts | Forecasted transactions      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains / (losses) reclassified from AOCI into earnings 83 26 (26)
Gains / (losses) recognized in OCI 40 82 (23)
Commodity contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains / (losses) reclassified from AOCI into earnings (52) 16 (23)
Gains / (losses) recognized in OCI (35) (2) 3
Gains / (losses) on ineffectiveness recognized in earnings (4) (10) 1
Interest rate contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains / (losses) reclassified from AOCI into earnings (31) (2) (4)
Gains / (losses) recognized in OCI $ (48) $ (159) $ 122