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Future Contract Benefit - Summary of Weighted-Average Interest Rates (Details) | Mar. 31, 2024 | Mar. 31, 2023
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Payout Annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest accretion rate | 3.90% | 3.90%
Current discount rate | 5.20% | 4.90%
Traditional Life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest accretion rate | 5.00% | 5.10%
Current discount rate | 5.00% | 4.80%
Group Protection |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest accretion rate | 3.20% | 2.90%
Current discount rate | 5.00% | 4.80%
UL and Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest accretion rate | 5.30% | 5.00%

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