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Derivative Instruments - Summary of Gains (Losses) Recognized in Earnings for Other Economic Hedges and Customer-Related Positions (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Commercial Products Revenue [Member] | Options [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings   $ 4
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Commercial Products Revenue [Member] | Futures [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings $ (1) 16
Customer-Related Positions [Member] | Swaps [Member] | Commercial Products Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings 52 17
Customer-Related Positions [Member] | Credit Contracts [Member] | Commercial Products Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings   5
Customer-Related Positions [Member] | Foreign Exchange Rate Contracts [Member] | Commercial Products Revenue [Member] | Forwards, Spots and Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings 28 15
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Interest Rate Contracts [Member] | Mortgage Banking Revenue [Member] | Futures and Forwards [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings $ 7 $ 223
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Interest Rate Contracts [Member] | Mortgage Banking Revenue [Member] | Options [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings $ (2) $ (47)
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Swaps [Member] | Mortgage Banking Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings 58 (204)
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Other Noninterest Income [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings (5) (3)
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Equity Contracts [Member] | Compensation Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings (3) (2)
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Other Derivatives [Member] | Other Noninterest Income [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in earnings $ (2) $ (1)