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Future Policy Benefits -Weighted Average Rates (Details)
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Traditional Life      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 2.33% 2.32% 2.29%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.96% 5.37% 2.41%
Immediate Annuities      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 3.11% 3.07% 3.04%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.02% 5.21% 3.07%
PRT      
Liability for Future Policy Benefit, Activity [Line Items]      
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 3.82% 3.20% 1.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.08% 5.40% 2.79%