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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