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Future Contract Benefits - Summary of Discounted and Undiscounted Expected Future Benefit Payments (Group Protection) (Details) - Group Protection - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Undiscounted |  |
Expected future benefit payments | $ 7,368 | $ 7,250
Discounted |  |
Expected future benefit payments | $ 5,628 | $ 5,689

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