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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of revenue and interest (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |
Revenues | $ 496 | $ 538
Interest expense | 29 | 20
Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Revenues | 446 | 494
Interest expense | 22 | 13
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Revenues | 50 | 44
Interest expense | $ 7 | $ 7

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