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Long-Duration Insurance Contracts - Weighted-Average Durations of LFPB (Details)	Sep. 30, 2023	Sep. 30, 2022
Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	17 years 9 months 18 days	17 years 8 months 12 days
Term Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	16 years 4 months 24 days	15 years 9 months 18 days
Experience Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years 4 months 24 days	10 years 8 months 12 days
Limited Pay Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	22 years 2 months 12 days	21 years 3 months 18 days
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years 4 months 24 days	9 years 10 months 24 days
SPIA (life contingent)
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	7 years 7 months 6 days	7 years 8 months 12 days

X

- 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

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Weighted-average duration of liability for future policy benefit, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)(5)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-6

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- Details

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- Details

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- Details

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- Details

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