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Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details)
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 1 month 6 days 8 years 1 month 6 days
Liability for Future Policy Benefit, Current Weighted-Average Duration 8 years 4 months 24 days 8 years 8 months 12 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.91% 4.95%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.02% 4.40%
Life Insurance, Permanent Limited Pay    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration 7 years 8 months 12 days 7 years 7 months 6 days
Liability for Future Policy Benefit, Current Weighted-Average Duration 7 years 7 months 6 days 7 years 10 months 24 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.30% 4.32%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.99% 4.36%
Home Service Insurance, Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration 16 years 2 months 12 days 15 years 4 months 24 days
Liability for Future Policy Benefit, Current Weighted-Average Duration 16 years 6 months 16 years 4 months 24 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.98% 5.02%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.09% 4.60%
Home Service Insurance, Life Insurance, Permanent Limited Pay    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration 14 years 8 months 12 days 14 years 4 months 24 days
Liability for Future Policy Benefit, Current Weighted-Average Duration 15 years 3 months 18 days 15 years 8 months 12 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 5.04% 5.06%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.09% 4.59%