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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Gross basis:      
Beginning of period reserves $ 278 $ 175 $ 219
Incurred losses 0 144 11
Paid losses (31) (42) (55)
End of period reserves 247 278 175
Net basis:      
Beginning of period reserves 257 156 198
Incurred losses 0 138 0
Paid losses (25) (37) (42)
End of period reserves $ 232 $ 257 $ 156