RELATED PERSON TRANSACTIONS - Sports Programming Rights (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) professional_team	Mar. 31, 2020 USD ($)
Related Party Transaction [Line Items]
Sports programming rights payments	$ 607	$ 612
Sports Teams Affiliates | RSNs
Related Party Transaction [Line Items]
Sports programming rights payments	$ 120	$ 70
Number of sports rights agreements assumed | professional_team	6