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Derivative and Hedging Activities and Restricted Cash - Net Gain (Loss) Recognized on Designated Instruments (Details) - USD ($) $ in Millions | 3 Months Ended
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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)

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