RESERVES FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Reserves For Losses And LAE [Line Items]
Current year incurred losses	$ 2,720	$ 2,521
Less reinsurance recoverables on unpaid losses	3,440	$ 3,593	$ 3,684	$ 3,651
Higher Premiums Earned
Reserves For Losses And LAE [Line Items]
Decrease in current year catastrophe losses	(24)
Hurricane
Reserves For Losses And LAE [Line Items]
Less reinsurance recoverables on unpaid losses	$ 25