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Related Party Transactions - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]        
Future policy benefits $ 273,281   $ 261,773 $ 324,942
Related Party        
Related Party Transaction [Line Items]        
Future policy benefits   $ 9,000    
Portion of in-force structured settlement annuities business   70.00%    
Prismic HoldCo        
Related Party Transaction [Line Items]        
Carrying value   $ 200    
Equity Method Investment, Ownership Percentage   20.00%    
Prismic HoldCo | Related Party        
Related Party Transaction [Line Items]        
Carrying value   $ 200    
Equity Method Investment, Ownership Percentage   20.00%