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Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, Derivatives $ 7 $ 12
Interest Rate Swap Agreements [Member] | Fixed Rate Long-Term Borrowings [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member] | Fair Value Hedges [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives in fair value hedging relationships, Derivative $ (60) $ 12
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Noninterest Expense Other Noninterest Expense
Derivatives in fair value hedging relationships, Hedged item $ 60 $ (12)
Interest Rate Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, Derivatives 3 8
Foreign Exchange and Other Option and Futures Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, Derivatives $ 4 $ 4