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Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details)
Mar. 31, 2025
Mar. 31, 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 2 months 12 days
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 7 months 6 days 8 years 6 months
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.86% 4.89%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.13% 5.10%
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 4.25% 4.28%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.15% 5.09%
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 2 months 12 days 16 years
Liability for Future Policy Benefit, Weighted-Average Duration 14 years 6 months 15 years 9 months 18 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.82% 4.97%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.49% 5.31%
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 3 months 18 days 14 years 6 months
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.87% 5.03%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.47% 5.31%