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Long-Duration Insurance Contracts - Weighted-Average Durations of LFPB (Details)
Mar. 31, 2024
Mar. 31, 2023
Whole Life Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Weighted-average duration 17 years 10 months 24 days 18 years
Term Life Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Weighted-average duration 16 years 7 months 6 days 17 years
Experience Life Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Weighted-average duration 10 years 3 months 18 days 11 years
Limited Pay Whole Life Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Weighted-average duration 21 years 10 months 24 days 23 years
Supplemental health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Weighted-average duration 10 years 9 months 18 days 10 years 2 months 12 days
Life Contingent SPIA Retirement Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Weighted-average duration 7 years 7 months 6 days 8 years