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Future Contract Benefits - Summary of Discounted and Undiscounted Expected Future Gross Premiums and Expected Future Benefit Payments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Payout Annuities |  |
Undiscounted |  |
Expected future gross premiums | $ 0 | $ 0
Expected future benefit payments | 3,437 | 3,553
Discounted |  |
Expected future gross premiums | 0 | 0
Expected future benefit payments | 2,119 | 1,943
Traditional Life |  |
Undiscounted |  |
Expected future gross premiums | 14,126 | 14,070
Expected future benefit payments | 14,377 | 14,579
Discounted |  |
Expected future gross premiums | 9,964 | 9,294
Expected future benefit payments | $ 10,118 | $ 9,399

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