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Future Policy Benefits - Weighted Average Rates (Details)	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Interest accretion rate	2.33%	2.32%	2.29%
Current discount rate	4.63%	5.37%	2.41%
Immediate Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Interest accretion rate	3.14%	3.07%	3.04%
Current discount rate	5.74%	5.21%	3.07%
PRT
Liability for Future Policy Benefit, Activity [Line Items]
Interest accretion rate	4.24%	3.20%	1.20%
Current discount rate	6.03%	5.40%	2.79%

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Current weighted-average discount rate used to measure liability for future policy benefit.

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Original weighted-average discount rate at contract issue date used to measure liability for future policy benefit.

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