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Future Policy Benefits - Gross Premium Income and Interest Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premium income | $ 2,111 | $ 1,522 | $ 1,314
Interest expense | 197 | 149 | 102
Traditional Life |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premium income | 123 | 137 | 152
Interest expense | 37 | 39 | 40
Immediate Annuities |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premium income | 24 | 23 | 16
Interest expense | 51 | 60 | 60
PRT |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premium income | 1,964 | 1,362 | 1,146
Interest expense | $ 109 | $ 50 | $ 2

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