RELATED PARTY TRANSACTIONS - Summary of Amounts Included in Condensed Consolidated Statements of Operations Related to Fee for Service Arrangement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Equity in earnings from unconsolidated affiliates	$ 2	$ 2	$ 7	$ 9
Commissions and other fees	1,018	1,116	2,959	2,843
Related Party
Related Party Transaction [Line Items]
Equity in earnings from unconsolidated affiliates	2	2	7	9
Commissions and other fees	$ 51	$ 52	$ 159	$ 133