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Borrowed Funds (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 03, 2024 | Jun. 03, 2024 | Dec. 31, 2024 | Sep. 06, 2034 | Jun. 06, 2029 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term borrowings |  |  | $ 500 |  |  | $ 0 |
FHLB, Advances, maximum amount available |  |  | $ 93,600 |  |  |  |
Weighted-average interest rate |  |  | 6.30% |  |  | 6.50% | 5.10%
Federal Home Loan Bank Advances |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term borrowings |  |  | $ 500 |  |  | $ 0 |
Federal Home Loan Bank Advances |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB, average interest rate for the year |  |  | 4.60% |  |  |  |
Parent Company | Senior Notes | Scenario, Forecast |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-termdebtfloatingrateinterestequaltoCompoundSOFR |  |  |  | 2.06% | 1.49% |  |
Parent Company | Five point Seven Two Two Percent Senior Note due June Two Thousand Thirty | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 750 |  |  |  |  |
Stated interest rate |  |  | 5.722% |  |  |  |
Parent Company | Five point Five Zero Two Percent Senior Note due Septmeber Two Thousand Thirty Five | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 1,000 |  |  |  |  |  |
Stated interest rate |  |  | 5.502% |  |  |  |

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