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RELATED PARTY TRANSACTIONS - Successor Company (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 10, 2023
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Apr. 01, 2022
Related Party Transaction [Line Items]                
General and administrative expenses     $ 7          
Intercompany liquidity agreement, maximum borrowing capacity           $ 300    
Intercompany liquidity agreement, outstanding   $ 80     $ 282      
Related Party Transaction, Amounts of Transaction     10          
Net investment income   78 97 $ 99 154      
Funding commitment   160     160      
Fortitude Group Holdings                
Related Party Transaction [Line Items]                
General and administrative expenses   9     17      
Subsequent Event                
Related Party Transaction [Line Items]                
Intercompany liquidity agreement, outstanding $ 82              
Carlyle Investment Management L.L.C.                
Related Party Transaction [Line Items]                
Assets under management, market value   612     612   $ 732  
Net investment income   $ 6 $ 1   $ 11      
Fortitude Group Holdings | Carlyle Investment Management L.L.C.                
Related Party Transaction [Line Items]                
Ownership               71.30%