RESERVE FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE - Summary of Activity in the Reserve for Losses and LAE (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves beginning of period	$ 14,977	$ 13,121
Less reinsurance recoverables on unpaid losses	(3,440)	(3,593)	$ (3,684)	$ (3,651)
Net reserves beginning of period	12,072	10,145	11,294	9,470
Incurred related to:
Current year	2,720	2,521
Prior years	(1)	9
Total incurred losses and LAE	2,719	2,530
Paid related to:
Current year	937	775
Prior years	1,019	1,063
Total paid losses and LAE	1,956	1,838
Foreign exchange/translation adjustment	15	(17)
Net reserves end of period	12,072	10,145
Less reinsurance recoverables on unpaid losses	3,440	3,593	$ 3,684	$ 3,651
Gross reserves end of period	$ 15,512	$ 13,738