Derivative and Hedging Activities and Restricted Cash - Net Gain (Loss) Recognized on Designated Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated other comprehensive loss	$ (7)	$ (25)
Futures | Net return on mortgage servicing rights
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated other comprehensive loss	0	2
Interest rate swaps and swaptions | Net return on mortgage servicing rights
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated other comprehensive loss	0	(34)
Mortgage-backed securities forwards | Net return on mortgage servicing rights
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated other comprehensive loss	0	(12)
Rate lock commitments, MBS forwards, and US Treasury Futures | Net gain on loan sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated other comprehensive loss	(7)	22
Interest rate swaps | Other non-interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated other comprehensive loss	$ 0	$ (3)