ACQUISITIONS AND DISPOSITIONS OF ASSETS (Details)	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) business	Feb. 28, 2021 USD ($) business	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) station	Sep. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)
Business Acquisition [Line Items]
Number of businesses sold | business	4	2
Gain on sale of assets			$ 4,000,000	$ 39,000,000	$ 26,000,000	$ 99,000,000
Number of stations assigned new channels | station					100
Broadcast incentive auction, total legislation funds to reimburse stations					$ 3,000,000,000
Broadcast incentive auction, gain recognized on sale			3,000,000	20,000,000	22,000,000	72,000,000
Broadcast incentive auction, total capital expenditure			1,000,000	$ 13,000,000	10,000,000	$ 54,000,000
Repacking process, maximum cost of equipment	$ 15,000,000		15,000,000		15,000,000
WDKA and KBSI Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Aggregate purchase price received on disposition		$ 28,000,000
Gain on sale of assets					12,000,000
Triangle Sign and Service, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Aggregate purchase price received on disposition							$ 12,000,000
Gain on sale of assets					6,000,000
Gain on sale attributable to noncontrolling interest					3,000,000
KOMO, KPLZ and KVI | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Aggregate purchase price received on disposition	$ 13,000,000		13,000,000		13,000,000
Gain on sale of assets			$ 1,000,000		$ 1,000,000
Zyp Media
Business Acquisition [Line Items]
Payment in cash		$ 7,000,000