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Future Policy Benefits - Actual Experience and Expected Experience for Mortality and Lapses (Details) | Mar. 31, 2024 | Dec. 31, 2023
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Actual experience | Traditional Life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Mortality rate | 1.20% | 1.70%
Lapse rate | 0.00% | 0.00%
Actual experience | Immediate Annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Mortality rate | 3.20% | 3.20%
Lapse rate | 0.00% | 0.00%
Actual experience | PRT |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Mortality rate | 4.20% | 3.20%
Lapse rate | 0.00% | 0.00%
Expected experience | Traditional Life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Mortality rate | 1.40% | 1.40%
Lapse rate | 0.40% | 0.30%
Expected experience | Immediate Annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Mortality rate | 2.30% | 1.80%
Lapse rate | 0.00% | 0.00%
Expected experience | PRT |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Mortality rate | 2.80% | 2.30%
Lapse rate | 0.00% | 0.00%

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