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Future Policy Benefits - Schedule of Reconciliation of Net FPB to the Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Future policy benefits $ 8,268 $ 7,050  
Traditional Life      
Liability for Future Policy Benefit, Activity [Line Items]      
Future policy benefits 1,385 1,349  
Immediate Annuities      
Liability for Future Policy Benefit, Activity [Line Items]      
Future policy benefits 1,393 1,415  
Deferred profit liability 90 87 $ 69
PRT      
Liability for Future Policy Benefit, Activity [Line Items]      
Future policy benefits 5,394 4,189  
Deferred profit liability 6 10 $ 4
Immediate annuities DPL      
Liability for Future Policy Benefit, Activity [Line Items]      
Deferred profit liability 90 87  
PRT DPL      
Liability for Future Policy Benefit, Activity [Line Items]      
Deferred profit liability $ 6 $ 10