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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 25	$ 18	$ 45	$ 33
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	10	14	20	24
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	14	13	26	26
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	2	7	5	14
Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(2)	(15)	(13)	(29)
Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	1	(1)	7	(2)
Corporate services income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	26	35	51	67
Corporate services income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	9	13	19	25
Corporate services income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	14	13	26	26
Corporate services income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	2	7	5	14
Corporate services income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	1	2	1	2
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)	(2)	2	1	3
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)	(2)	2	1	3
Other income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	1	(19)	(7)	(37)
Other income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	1	1	1	(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)	(3)	(17)	(14)	(31)
Other income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 3	$ (3)	$ 6	$ (5)