Derivative and Hedging Activities - Net Gain (Loss) Recognized on Designated Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in AOCL	$ 23	$ 11
Futures | Net return on mortgage servicing rights
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in AOCL	(2)	(1)
Interest rate swaps and swaptions | Net return on mortgage servicing rights
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in AOCL	7	(11)
Mortgage-backed securities forwards | Net return on mortgage servicing rights
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in AOCL	(2)	(4)
Rate lock commitments and US Treasury futures | Net gain on loan sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in AOCL	20	28
Forward commitments | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in AOCL	0	(1)
Interest rate swaps | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in AOCL	$ 0	$ 0