Quarterly report pursuant to Section 13 or 15(d)

Amount and Location in the Income Statement for Derivatives Designed as Cash Flow Hedges (Detail)

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Amount and Location in the Income Statement for Derivatives Designed as Cash Flow Hedges (Detail) (Cash Flow Hedging [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) $ 45 $ 49 $ 9 $ (102)
Interest Rate Contracts
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) 1 (11) 4 (72)
Foreign Exchange Contracts
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) 44 60 53 (30)
Commodity Contracts
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) $ 0 $ 0 $ (48) $ 0