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Future Policy Benefits - Reconciliation of Net FPB to the Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]        
Future policy benefits $ 5,371 $ 5,021 $ 4,918  
Traditional Life        
Liability for Future Policy Benefit, Activity [Line Items]        
Future policy benefits 1,382 1,354 1,752  
Immediate Annuities        
Liability for Future Policy Benefit, Activity [Line Items]        
Future policy benefits 1,452 1,429 1,954  
Deferred profit liability 77 69 57 $ 22
PRT        
Liability for Future Policy Benefit, Activity [Line Items]        
Future policy benefits 2,456 2,165 1,148  
Deferred profit liability 4 4 7 $ 0
Immediate annuities DPL        
Liability for Future Policy Benefit, Activity [Line Items]        
Deferred profit liability 77 69 57  
PRT DPL        
Liability for Future Policy Benefit, Activity [Line Items]        
Deferred profit liability $ 4 $ 4 $ 7