NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Broadcast Television Programming and Sports Programming Rights (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Estimated future rebates due from teams	$ 9
Television Programming Contract Rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Television programming contract period	1 year
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