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Derivatives and Hedging Activities - Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) $ (4) $ 14
Interest rate    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 6 2
Foreign exchange    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 11 12
Commodity    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 4 2
Credit    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) (4) (15)
Other    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) (21) 13
Corporate services income    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 26 9
Corporate services income | Interest rate    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 6 11
Corporate services income | Foreign exchange    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 11 12
Corporate services income | Commodity    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 4 2
Corporate services income | Credit    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 5 (16)
Corporate services income | Other    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 0 0
Consumer mortgage income    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 1 4
Consumer mortgage income | Interest rate    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 0 0
Consumer mortgage income | Foreign exchange    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 0 0
Consumer mortgage income | Commodity    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 0 0
Consumer mortgage income | Credit    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 0 0
Consumer mortgage income | Other    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 1 4
Other income    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) (31) 1
Other income | Interest rate    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 0 (9)
Other income | Foreign exchange    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 0 0
Other income | Commodity    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) 0 0
Other income | Credit    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) (9) 1
Other income | Other    
Derivative Instruments, Gain (Loss) [Line Items]    
Total net gains (losses) $ (22) $ 9