NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Broadcast Television Programming and Sports Programming Rights (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Estimated future rebates due from teams	$ 42
Television programming contract rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Television programming contract period	7 years
Contract period utilizing accelerated amortization method	3 years
Television programming contract rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Television programming contract period	1 year