NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Information - Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income taxes paid	$ 11	$ 32	$ 17
Income tax refunds	2	2	0
Interest paid	634	283	285
Non-cash transactions
Non-cash transaction property and equipment	6	$ 10	$ 11
Transfer of an asset for property	7
Equity interests received	199
Non-cash transaction related to sports rights	$ 22