NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,539	$ 1,125	$ 4,431	$ 2,618
Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	1,003	679	3,168	1,398
Advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	500	376	1,135	1,024
Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	36	70	128	196
Operating segments | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	734	661	2,026	1,939
Operating segments | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	727	352	2,155	352
Operating segments | Other
Disaggregation of Revenue [Line Items]
Total revenues	105	129	338	354
Operating segments | Distribution revenue | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	356	340	1,059	995
Operating segments | Distribution revenue | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	597	306	1,959	306
Operating segments | Distribution revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	50	33	150	97
Operating segments | Advertising revenue | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	344	302	861	904
Operating segments | Advertising revenue | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	124	43	182	43
Operating segments | Advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	31	32	92	78
Operating segments | Other media, non-media, and intercompany revenues | Broadcast
Disaggregation of Revenue [Line Items]
Total revenues	34	19	106	40
Operating segments | Other media, non-media, and intercompany revenues | Local sports
Disaggregation of Revenue [Line Items]
Total revenues	6	3	14	3
Operating segments | Other media, non-media, and intercompany revenues | Other
Disaggregation of Revenue [Line Items]
Total revenues	24	64	96	179
Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	(27)	(17)	(88)	(27)
Eliminations | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Eliminations | Advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	1	(1)	0	(1)
Eliminations | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ (28)	$ (16)	$ (88)	$ (26)