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Future Policy Benefit Reserves - Weighted Average Interest Rates (Details) | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
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Insurance [Abstract] |  |  |
Original locked in discount rate | 5.26% | 5.27% | 5.31%
Upper-medium grade fixed income instrument discount rate | 4.92% | 5.23% | 3.67%

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