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Other Insurance Liabilities and Separate Accounts - Weighted-average Interest Rates and Durations (Details) | Sep. 30, 2023 | Sep. 30, 2022
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Large Case Pensions |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest accretion rate | 4.20% | 4.20%
Current discount rate | 5.86% | 5.42%
Weighted-average duration of long-duration insurance liabilities | 7 years 4 months 24 days | 7 years 4 months 24 days
Long-Term Care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest accretion rate | 5.11% | 5.11%
Current discount rate | 5.99% | 5.65%
Weighted-average duration of long-duration insurance liabilities | 12 years 2 months 12 days | 12 years 9 months 18 days

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