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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
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 $ (14) $ 2 $ 3 $ 11
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   (3) (18) (7)
Customer-Related Positions [Member] | Swaps [Member] | Commercial Products Revenue [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in earnings 59 26 103 61
Customer-Related Positions [Member] | Credit Contracts [Member] | Commercial Products Revenue [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in earnings (10) (4) (15) (12)
Customer-Related Positions [Member] | Foreign Exchange Rate Contracts [Member] | Commercial Products Revenue [Member] | Options [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in earnings 1 1 1 1
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 20 20 54 59
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Interest Rate Contracts [Member] | Mortgage Banking Revenue/Other Noninterest Income [Member] | Futures and Forwards [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in earnings 46 20 53 (20)
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 428 154 1,173 347
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 (51) 215 724 513
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 (2) $ (3) 9 (18)
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 $ (69)   $ (70)