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RELATED PARTY TRANSACTIONS - Successor Company (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2021
Apr. 01, 2022
Related Party Transaction [Line Items]          
Intercompany liquidity agreement, maximum borrowing capacity         $ 50
Intercompany liquidity agreement, outstanding $ 0        
Net investment income 97 $ 99 $ 146 $ 285  
Funding commitment 290        
Fortitude Group Holdings          
Related Party Transaction [Line Items]          
Allocation of costs 7        
Carlyle Investment Management L.L.C.          
Related Party Transaction [Line Items]          
Allocation of costs 10        
Net investment income 1        
Carlyle Investment Management L.L.C.          
Related Party Transaction [Line Items]          
Assets under management, market value $ 286        
Fortitude Group Holdings | Carlyle Investment Management L.L.C.          
Related Party Transaction [Line Items]          
Ownership         71.50%