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
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) $ 43 $ 277 $ 190 $ 206
Interest Rate Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) (1) 0 (1) (3)
Foreign Exchange Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) $ 44 $ 277 $ 191 $ 209