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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
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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%

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