Future policy benefits (Weighted average interest rates) (Details) - Segment Life [Member]	Sep. 30, 2023	Sep. 30, 2022
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Interest Accretion Rate	2.90%	2.60%
Current Discount Rate	6.00%	6.10%
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Interest Accretion Rate	3.20%	3.90%
Current Discount Rate	4.70%	5.50%
Accident and Health Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Interest Accretion Rate	3.70%	3.60%
Current Discount Rate	6.70%	6.10%
Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Interest Accretion Rate	2.60%	3.70%
Current Discount Rate	4.30%	6.20%