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Future Policy Benefits Reserves - Undiscounted Expected Future Benefit and Expense Payments and Undiscounted Expected Future Gross Premiums (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Insurance [Abstract] |  |
Expected future benefit and expense payments | $ 32,009 | $ 33,217
Expected future gross premiums | $ 5,305 | $ 5,557

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