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Future policy benefits (Weighted average interest rates) (Details) - Segment Life [Member] | Sep. 30, 2023 | Sep. 30, 2022
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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%

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- Definition Current weighted-average discount rate used to measure liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Original weighted-average discount rate at contract issue date used to measure liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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