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Other Insurance Liabilities and Separate Accounts - Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Large Case Pensions |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments | $ 2,854 | $ 3,091
Expected gross premiums | 0 | 0
Long-Term Care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments | 3,143 | 3,198
Expected gross premiums | $ 375 | $ 402

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