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Long-Duration Insurance Contracts - Discount Rates for LFPB (Details) | Mar. 31, 2025 | Mar. 31, 2024
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Whole Life | Minimum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 1.70% | 1.70%
Current discount rate | 4.90% | 4.60%
Whole Life | Maximum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 4.80% | 4.90%
Current discount rate | 5.70% | 5.40%
Term Life | Minimum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 4.10% | 4.20%
Current discount rate | 5.40% | 5.20%
Term Life | Maximum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 4.20% | 4.20%
Current discount rate | 5.40% | 5.30%
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 6.10% | 6.10%
Current discount rate | 5.50% | 5.30%
Limited-Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 4.00% | 4.00%
Current discount rate | 5.80% | 5.40%
Supplemental health | Minimum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 1.70% | 1.70%
Current discount rate | 5.50% | 5.30%
Supplemental health | Maximum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 2.80% | 2.70%
Current discount rate | 5.70% | 5.40%
SPIA (life contingent) | Minimum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 1.70% | 1.70%
Current discount rate | 5.30% | 5.20%
SPIA (life contingent) | Maximum |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Interest accretion rate | 4.10% | 4.10%
Current discount rate | 5.30% | 5.20%

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- Definition Current weighted-average discount rate used to measure liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E + Details
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