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Future Policy Benefit Reserves - Undiscounted Expected Future Benefit and Expense Payments and Undiscounted Expected Future Gross Premiums (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Insurance [Abstract] |  |
Expected future benefit and expense payments | $ 33,217 | $ 34,496
Expected future gross premiums | $ 5,557 | $ 6,034

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