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Future policy benefits (Weighted average interest rates) (Details) - Segment Life [Member]
Mar. 31, 2025
Mar. 31, 2024
Term Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Interest Accretion Rate 3.00% 2.90%
Current Discount Rate 5.60% 5.70%
Whole Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Interest Accretion Rate 3.50% 3.20%
Current Discount Rate 4.00% 4.50%
Accident and Health Insurance Product Line [Member]    
Liability for Future Policy Benefit, Activity [Line Items]    
Interest Accretion Rate 4.10% 3.70%
Current Discount Rate 5.70% 6.30%
Insurance, Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Interest Accretion Rate 3.20% 2.60%
Current Discount Rate 3.60% 3.80%