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Future Policy Benefits - Gross Premium Income and Interest Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premium income $ 2,346 $ 2,111 $ 1,522
Interest expense 336 197 149
Traditional life      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premium income 111 123 137
Interest expense 37 37 39
Immediate annuities      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premium income 18 24 23
Interest expense 59 51 60
PRT      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premium income 2,217 1,964 1,362
Interest expense $ 240 $ 109 $ 50