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v3.24.0.1

Investments (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |
Equity Securities, FV-NI | $ 7,500,000 | $ 7,600,000 |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock | 23,500,000 | 15,500,000 |
Certificates of Deposit, at Carrying Value |  | 700,000 |
nongovernmentalissuerover10%ofequity | 0 | 0 |
Credit-related net investment impairment losses | 0 | 0 | $ 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0 |
Asset Pledged as Collateral |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Restricted | $ 709,000,000 | $ 886,000,000 |

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