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Future Policy Benefits - Reconciliation of Net FPB to the Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Future policy benefits $ 7,441 $ 7,050  
Traditional Life      
Liability for Future Policy Benefit, Activity [Line Items]      
Future policy benefits 1,318 1,349  
Immediate Annuities      
Liability for Future Policy Benefit, Activity [Line Items]      
Future policy benefits 1,372 1,415  
Deferred profit liability 88 87 $ 69
PRT      
Liability for Future Policy Benefit, Activity [Line Items]      
Future policy benefits 4,655 4,189  
Deferred profit liability 8 10 $ 4
Immediate annuities DPL      
Liability for Future Policy Benefit, Activity [Line Items]      
Deferred profit liability 88 87  
PRT DPL      
Liability for Future Policy Benefit, Activity [Line Items]      
Deferred profit liability $ 8 $ 10