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Derivative and Hedging Activities - Net Gain (Loss) Recognized on Designated Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | $ (72) | $ (65)
Futures | Net return on mortgage servicing rights |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | 0 | 3
Interest rate swaps and swaptions | Net return on mortgage servicing rights |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | (61) | (83)
Mortgage-backed securities forwards | Net return on mortgage servicing rights |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | (12) | (25)
Rate lock commitments and US Treasury futures | Net gain on loan sales |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | 1 | 39
Interest rate swaps | Other noninterest income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | $ 0 | $ 1

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