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LIABILITY FOR UNPAID CLAIMS AND CLAIM ADJUSTMENT EXPENSES - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]      
Prior accident years $ 34 $ (22)  
IBNR & Expected Development on Reported Losses $ 8   $ 4