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RESERVE FOR LOSSES AND LAE - Schedule of Incurred Losses with Respect to A&E Reserve on both Gross and Net of Reinsurance Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Gross basis:      
Beginning of period reserves $ 247 $ 278 $ 175
Incurred losses 62 0 144
Paid losses (49) (31) (42)
End of period reserves 260 247 278
Net basis:      
Beginning of period reserves 232 257 156
Incurred losses 54 0 138
Paid losses (43) (25) (37)
End of period reserves $ 242 $ 232 $ 257