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Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details)
Jun. 30, 2025
Jun. 30, 2024
Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 8 years 6 months 8 years 3 months 18 days
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 6 months 8 years 6 months
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.86% 4.88%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.12% 5.18%
Life Insurance, Permanent Limited Pay    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 8 years 8 years 1 month 6 days
Liability for Future Policy Benefit, Weighted-Average Duration 7 years 7 months 6 days 7 years 9 months 18 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.26% 4.28%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.12% 5.18%
Home Service Insurance, Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 15 years 1 month 6 days 16 years 1 month 6 days
Liability for Future Policy Benefit, Weighted-Average Duration 14 years 2 months 12 days 15 years 8 months 12 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.84% 4.96%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.62% 5.37%
Home Service Insurance, Life Insurance, Permanent Limited Pay    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 13 years 8 months 12 days 14 years 6 months
Liability for Future Policy Benefit, Weighted-Average Duration 13 years 1 month 6 days 14 years 4 months 24 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.89% 5.03%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.58% 5.37%