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Long-Duration Insurance Contracts - Weighted-Average Durations of LFPB (Details) | Mar. 31, 2024 | Mar. 31, 2023
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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

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- Definition Weighted-average duration of liability for future policy benefit, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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