Derivatives and Hedging Activities - Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 43	$ 16	$ 78	$ 35
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	9	8	43	20
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	12	12	37	34
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	5	4	13	12
Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(17)	(8)	(31)	(22)
Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	34	0	16	(9)
Corporate services income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	28	25	88	70
Corporate services income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	11	8	37	19
Corporate services income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	12	12	37	34
Corporate services income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	5	4	13	12
Corporate services income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	1	1	5
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)	4	0	2	13
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)	4	0	2	13
Other income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	11	(9)	(12)	(48)
Other income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(2)	0	6	1
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)	(17)	(9)	(32)	(27)
Other income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 30	$ 0	$ 14	$ (22)