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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, 2025 | Jun. 30, 2024
--- | --- | ---
Undiscounted |  |
Expected future benefit payments | $ 7,447 | $ 7,290
Discounted |  |
Expected future benefit payments | $ 5,759 | $ 5,570

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