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Future Contract Benefits - Summary of Discounted and Undiscounted Expected Future Benefit Payments (Group Protection) (Details) - Group Protection - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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Undiscounted |  |
Expected future benefit payments | $ 7,413 | $ 7,296
Discounted |  |
Expected future benefit payments | $ 5,712 | $ 5,640

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