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Future Contract Benefits - Summary of Discounted and Undiscounted Expected Future Benefit Payments (Group Protection) (Details) - Group Protection - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | ---
Undiscounted |  |
Expected future benefit payments | $ 7,290 | $ 7,111
Discounted |  |
Expected future benefit payments | $ 5,570 | $ 5,493

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