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Future Policy Benefits - Gross Premium Income and Interest Expense (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premium income | $ 1,319 | $ 1,249
Interest expense | 149 | 105
Traditional Life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premium income | 94 | 104
Interest expense | 28 | 29
Immediate Annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premium income | 18 | 20
Interest expense | 42 | 45
PRT |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premium income | 1,207 | 1,125
Interest expense | $ 79 | $ 31

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