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Future policy benefits (Weighted average interest rates) (Details) - Segment Life [Member] | Mar. 31, 2024 | Mar. 31, 2023
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Term Life Insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest Accretion Rate | 2.90% | 2.80%
Current Discount Rate | 5.70% | 5.70%
Whole Life Insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest Accretion Rate | 3.20% | 4.00%
Current Discount Rate | 4.50% | 5.20%
Accident and Health Insurance Product Line [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest Accretion Rate | 3.70% | 3.80%
Current Discount Rate | 6.30% | 6.20%
Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest Accretion Rate | 2.60% | 3.80%
Current Discount Rate | 3.80% | 4.80%

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