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Derivative and Hedging Activities - Net Gain (Loss) Recognized on Designated Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | $ (16) | $ 7
Futures | Net return on mortgage servicing rights |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | 5 | 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 | (29) | (22)
Mortgage-backed securities forwards | Net return on mortgage servicing rights |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | (11) | (13)
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 | 18 | 38
Interest rate swaps | Other noninterest income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in AOCL | $ 1 | $ 1

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