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Future Policy Benefits - Gross Premium Income and Interest Expense (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premium income $ 977 $ 811
Interest expense 157 102
Traditional Life    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premium income 57 63
Interest expense 18 19
Immediate Annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premium income 12 11
Interest expense 30 33
PRT    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premium income 908 737
Interest expense $ 109 $ 50