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) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments in Cash Flow Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ 412 $ (243) $ 277 $ (290)
Derivative Instruments in Cash Flow Hedging Relationships | Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 1 0 2 0
Derivative Instruments in Cash Flow Hedging Relationships | Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 411 (243) 275 (290)
Non-derivative Instruments in Net Investment Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 218 (210) 138 (247)
Non-derivative Instruments in Net Investment Hedging Relationships | Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ 218 $ (210) $ 138 $ (247)