NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,612	$ 1,283	$ 3,123	$ 2,892
Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	1,078	1,010	2,187	2,165
Advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	491	235	862	635
Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	43	38	74	92
Operating Segments | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	687	592	1,352	1,292
Operating Segments | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	838	616	1,606	1,428
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenues	120	104	228	233
Operating Segments | Distribution revenue | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	363	349	724	703
Operating Segments | Distribution revenue | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	666	610	1,364	1,362
Operating Segments | Distribution revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	49	51	99	100
Operating Segments | Advertising revenue | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	280	208	547	517
Operating Segments | Advertising revenue | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	162	3	227	58
Operating Segments | Advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	54	25	94	61
Operating Segments | Other media, non-media, and intercompany revenues | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	44	35	81	72
Operating Segments | Other media, non-media, and intercompany revenues | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	10	3	15	8
Operating Segments | Other media, non-media, and intercompany revenues | Other
Disaggregation of Revenue [Line Items]
Total revenues	17	28	35	72
Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	(33)	(29)	(63)	(61)
Eliminations | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Eliminations | Advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	(5)	(1)	(6)	(1)
Eliminations | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ (28)	$ (28)	$ (57)	$ (60)