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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments in Cash Flow Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives $ 330 $ 58 $ 467 $ 335
Derivative Instruments in Cash Flow Hedging Relationships | Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives (1) 1 10 3
Derivative Instruments in Cash Flow Hedging Relationships | Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives 331 57 457 332
Non-derivative Instruments in Net Investment Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives 191 10 197 148
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 Derivatives $ 191 $ 10 $ 197 $ 148