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Long-Duration Insurance Contracts - Actual and Expected Experience of Mortality Rate and Lapse Rate (Details)
Sep. 30, 2024
Sep. 30, 2023
Whole Life Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality / Morbidity, actual experience 0.70% 0.70%
Mortality / Morbidity, expected experience 0.80% 0.70%
Lapse rate, actual experience 3.00% 3.60%
Lapse rate, expected experience 4.40% 4.70%
Term Life Insurance | Minimum    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality / Morbidity, actual experience 0.10% 0.10%
Mortality / Morbidity, expected experience 0.10% 0.10%
Lapse rate, actual experience 3.70% 5.30%
Lapse rate, expected experience 5.40% 5.70%
Term Life Insurance | Maximum    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality / Morbidity, actual experience 0.30% 0.60%
Mortality / Morbidity, expected experience 0.80% 1.70%
Lapse rate, actual experience 28.60% 7.30%
Lapse rate, expected experience 12.80% 32.20%
Experience Life Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality / Morbidity, actual experience 1.90% 1.70%
Mortality / Morbidity, expected experience 1.70% 1.60%
Lapse rate, actual experience 2.90% 3.20%
Lapse rate, expected experience 3.00% 3.10%
Limited Pay Whole Life Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality / Morbidity, actual experience 0.20% 0.10%
Mortality / Morbidity, expected experience 0.30% 0.30%
Lapse rate, actual experience 3.90% 4.30%
Lapse rate, expected experience 4.70% 5.30%
Supplemental health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality / Morbidity, actual experience 33.90% 31.90%
Mortality / Morbidity, expected experience 26.30% 26.00%
Lapse rate, actual experience 9.30% 8.40%
Lapse rate, expected experience 9.70% 9.20%