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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Ratio of Actual to Expected Experience used in the Determination of the Reserve for Future Policy Benefits (Details) | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Mortality | Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Actual to expected experience | 95.00% | 238.00%
Morbidity | Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Actual to expected experience | 92.00% | 94.00%
Lapses | Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Actual to expected experience | 116.00% | 123.00%
Lapses | Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Actual to expected experience | 89.00% | 75.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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