Derivatives and Hedging Activities - Schedule of Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 23	$ 43	$ 56	$ 78
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	9	9	33	43
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	13	12	39	37
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	5	5	19	13
Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(12)	(17)	(41)	(31)
Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	7	34	6	16
Corporate services income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	26	28	93	88
Corporate services income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	8	11	33	37
Corporate services income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	13	12	39	37
Corporate services income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	5	5	19	13
Corporate services income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	2	1
Corporate services income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	1	4	4	2
Consumer mortgage income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	1	4	4	2
Other income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(6)	11	(41)	(12)
Other income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	1	(2)	0	6
Other income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Other income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Other income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(12)	(17)	(43)	(32)
Other income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 6	$ 30	$ 2	$ 14