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Derivative and Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest , loans and leases held-for-sale | $ 8 | $ 15 |
Hedged debt, carrying amount | 6,400 | 6,400 |
Fair value of interest rate fair value hedging instruments |  | 46 |
Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amount | 2,000 | 2,000 |
Interest rate swaps | Derivatives designated hedging instruments: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amount | 2,000 | 2,000 |
Interest rate swaps on FHLB advances | Derivatives designated hedging instruments: | Cash flow hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, notional amount | 5,500 | 5,500 | $ 3,800
Unrealized gains on cash flow hedges: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized losses on derivatives classified as cash flow hedges |  | 110 | $ 52
Amount of gain (loss), net of tax, to be reclassified during the next 12 months | $ 124 | $ 124 |

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