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Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details)
Dec. 31, 2025
Dec. 31, 2024
International Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 8 years 1 month 6 days 7 years 10 months 24 days
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 8 years
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.81% 4.86%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.82% 5.24%
Domestic Insurance, Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 17 years 2 months 12 days 16 years 10 months 24 days
Liability for Future Policy Benefit, Weighted-Average Duration 16 years 1 month 6 days 16 years 6 months
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.95% 5.03%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.48% 5.63%
International Insurance, Permanent Limited Pay    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 7 years 8 months 12 days 6 years 10 months 24 days
Liability for Future Policy Benefit, Weighted-Average Duration 7 years 3 months 18 days 6 years 8 months 12 days
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.21% 4.17%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.85% 5.21%
Domestic 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 7 months 6 days 14 years 2 months 12 days
Liability for Future Policy Benefit, Weighted-Average Duration 12 years 9 months 18 days 13 years 6 months
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.84% 4.99%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.44% 5.62%