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Other Insurance Liabilities and Separate Accounts - Weighted-average Interest Rates and Durations (Details)
Sep. 30, 2025
Sep. 30, 2024
Large Case Pensions    
Liability for Future Policy Benefit, Activity [Line Items]    
Interest accretion rate 4.21% 4.20%
Current discount rate 5.07% 4.82%
Weighted-average duration of long-duration insurance liabilities 7 years 2 months 12 days 7 years 3 months 18 days
Long-Term Care    
Liability for Future Policy Benefit, Activity [Line Items]    
Interest accretion rate 5.11% 5.11%
Current discount rate 5.42% 5.07%
Weighted-average duration of long-duration insurance liabilities 11 years 3 months 18 days 11 years 9 months 18 days