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Future Contract Benefit - Summary of Gross Premiums and Interest Accretion (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Payout Annuities |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Gross premiums | $ 40 | $ 16 | $ 84 | $ 88
Interest accretion | 22 | 21 | 65 | 64
Traditional Life |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Gross premiums | 311 | 310 | 942 | 937
Interest accretion | $ 37 | $ 35 | $ 111 | $ 106

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