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Future Contract Benefits - Summary of Discounted and Undiscounted Expected Future Benefit Payments (Group Protection) (Details) - Group Protection - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Undiscounted |  |
Expected future benefit payments | $ 7,154 | $ 7,148
Discounted |  |
Expected future benefit payments | $ 5,773 | $ 5,373

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