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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments in Cash Flow Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives $ (57) $ (82) $ 106 $ 264
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 (3) (2) 0 (3)
Derivative Instruments in Cash Flow Hedging Relationships | Foreign currency exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives (54) (80) 106 267
Non-derivative Instruments in Net Investment Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives (47) (103) 77 47
Non-derivative Instruments in Net Investment Hedging Relationships | Foreign currency exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives $ (47) $ (103) $ 77 $ 47