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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments in Cash Flow Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives $ 166 $ (221) $ 272 $ 43
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 (3) 1 (6)
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 165 (218) 271 49
Non-derivative Instruments in Net Investment Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives 90 (139) 167 (92)
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 $ 90 $ (139) $ 167 $ (92)