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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Revenue and Interest Recognized (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |
Revenues | $ 711 | $ 677
Interest expense | 33 | 37
Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Revenues | 605 | 600
Interest expense | 21 | 27
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Revenues | 106 | 77
Interest expense | $ 12 | $ 10

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