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Long-Duration Insurance Contracts - Actual and Expected Experience of Mortality Rate and Lapse Rate (Details) | Mar. 31, 2024 | Mar. 31, 2023
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Whole Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Mortality, actual experience | 0.70% | 0.70%
Mortality, expected experience | 0.70% | 0.70%
Lapse rate, actual experience | 3.40% | 3.60%
Lapse rate, expected experience | 4.30% | 4.60%
Term Life Insurance | Minimum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Mortality, actual experience | 0.10% | 0.10%
Mortality, expected experience | 0.10% | 0.10%
Lapse rate, actual experience | 3.60% | 5.60%
Lapse rate, expected experience | 5.10% | 2.80%
Term Life Insurance | Maximum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Mortality, actual experience | 0.20% | 0.30%
Mortality, expected experience | 0.40% | 0.60%
Lapse rate, actual experience | 22.00% | 8.30%
Lapse rate, expected experience | 6.90% | 5.60%
Experience Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Mortality, actual experience | 2.10% | 1.90%
Mortality, expected experience | 1.70% | 1.60%
Lapse rate, actual experience | 3.40% | 3.40%
Lapse rate, expected experience | 3.00% | 3.00%
Limited Pay Whole Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Mortality, actual experience | 0.00% | 0.00%
Mortality, expected experience | 0.30% | 0.20%
Lapse rate, actual experience | 3.60% | 3.60%
Lapse rate, expected experience | 4.60% | 5.10%

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