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Future Policy Benefits Reserves - Weighted Average Interest Rates (Details) | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
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Insurance [Abstract] |  |  |
Original locked in discount rate | 5.20% | 5.22% | 5.24%
Upper-medium grade fixed income instrument discount rate | 4.90% | 4.94% | 5.78%

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