COMMITMENTS AND CONTINGENCIES (Narrative) (Details)							3 Months Ended
	May 10, 2021 lawsuit	Oct. 15, 2020 USD ($)	Sep. 02, 2020 USD ($)	Aug. 19, 2020 USD ($)	May 22, 2020 USD ($) petition	Dec. 21, 2017 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Oct. 03, 2018 lawsuit
COMMITMENTS AND CONTINGENCIES
Interest expense including amortization of debt discount and deferred financing costs							$ (151,000,000)	$ (180,000,000)
Various Cases Alleging Violation of Sherman Antitrust Act
COMMITMENTS AND CONTINGENCIES
Loss contingency, number of other broadcasters | lawsuit										13
Various Cases Alleging Violation of Sherman Antitrust Act | Subsequent Event
COMMITMENTS AND CONTINGENCIES
Loss contingency, new claims filed, number (lawsuit) | lawsuit	22
Breach of Merger Agreement
COMMITMENTS AND CONTINGENCIES
Agreement to pay to resolve FCC investigation					$ 48,000,000
Payments for resolve FCC investigation				$ 48,000,000
Compliance plan term					4 years
Number of petitions filed | petition					2
Unfavorable Regulatory Action
COMMITMENTS AND CONTINGENCIES
Proposed fine per station		$ 25,000	$ 500,000
Proposed fine			$ 9,000,000			$ 13,000,000
Fixed Payment Obligations | RSNs
COMMITMENTS AND CONTINGENCIES
Other current liabilities							31,000,000		$ 31,000,000
Other long-term liabilities							98,000,000		97,000,000
Interest expense including amortization of debt discount and deferred financing costs							(2,000,000)	$ (2,000,000)
Variable Payment Obligations | RSNs
COMMITMENTS AND CONTINGENCIES
Other current liabilities							14,000,000		12,000,000
Other long-term liabilities							41,000,000		$ 41,000,000
Other income, net | Variable Payment Obligations | RSNs
COMMITMENTS AND CONTINGENCIES
Contingent Consideration Adjustment							$ 1,000,000