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Future Contract Benefit - Summary of Gross Premiums and Interest Accretion (UL and Other) (Details) - UL and Other - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Gross premiums | $ 678 | $ 542 | $ 1,444 | $ 1,457
Interest accretion | $ 212 | $ 190 | $ 421 | $ 376

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