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RELATED PARTY TRANSACTIONS - Successor Company (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 10 Months Ended
Oct. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2022
Sep. 30, 2023
Oct. 31, 2023
Dec. 31, 2022
Apr. 01, 2022
Related Party Transaction [Line Items]                  
Intercompany liquidity agreement, maximum borrowing capacity   $ 300       $ 300      
Intercompany liquidity agreement, outstanding   82              
Related Party Transaction, Amounts of Transaction     $ 10            
Net investment income   73 92 $ 99 $ 189 227      
Funding commitment   162       162      
Subsequent Event                  
Related Party Transaction [Line Items]                  
Intercompany liquidity agreement, outstanding $ 75           $ 357    
Fortitude Group Holdings                  
Related Party Transaction [Line Items]                  
General and administrative expenses   8 8   15 25      
Carlyle Investment Management L.L.C.                  
Related Party Transaction [Line Items]                  
Assets under management, market value   773       773   $ 732  
Net investment income   $ 12 $ 2   $ 3 $ 23      
Fortitude Group Holdings | Carlyle Investment Management L.L.C.                  
Related Party Transaction [Line Items]                  
Ownership                 71.30%