RESERVES 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	246	278	175
Net basis:
Beginning of period reserves	210	128	167
Incurred losses	0	113	(3)
Paid losses	(21)	(32)	(36)
End of period reserves	$ 189	$ 210	$ 128