NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,511	$ 1,609
Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	1,109	1,156
Advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	371	400
Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	31	53
Operating segments | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	665	701
Operating segments | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	768	812
Operating segments | Other
Disaggregation of Revenue [Line Items]
Total revenues	108	128
Operating segments | Distribution revenue | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	361	355
Operating segments | Distribution revenue | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	698	752
Operating segments | Distribution revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	50	49
Operating segments | Advertising revenue | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	267	310
Operating segments | Advertising revenue | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	65	55
Operating segments | Advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	40	35
Operating segments | Other media, non-media, and intercompany revenues | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	37	36
Operating segments | Other media, non-media, and intercompany revenues | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	5	5
Operating segments | Other media, non-media, and intercompany revenues | Other
Disaggregation of Revenue [Line Items]
Total revenues	18	44
Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	(30)	(32)
Eliminations | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Eliminations | Advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	(1)	0
Eliminations | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ (29)	$ (32)