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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 829	$ 768	$ 1,627	$ 1,541
Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	435	418	871	844
Core advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	303	303	600	609
Political advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	40	6	64	9
Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	51	41	92	79
Operating Segments | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	750	699	1,477	1,404
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenues	20	14	35	31
Operating Segments | Distribution revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	384	372	768	753
Operating Segments | Distribution revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Core advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	285	287	569	580
Operating Segments | Core advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	9	6	15	12
Operating Segments | Political advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	40	6	64	9
Operating Segments | Political advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Other media, non-media, and intercompany revenues | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	41	34	76	62
Operating Segments | Other media, non-media, and intercompany revenues | Other
Disaggregation of Revenue [Line Items]
Total revenues	11	8	20	19
Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	(8)	(5)	(15)	(9)
Eliminations | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Eliminations | Core advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	(5)	(4)	(8)	(6)
Eliminations | Political advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Eliminations | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	(3)	(1)	(7)	(3)
Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Total revenues	750	743	1,477	1,516
Sinclair Broadcast Group, LLC | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues		403		829
Sinclair Broadcast Group, LLC | Core advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues		297		604
Sinclair Broadcast Group, LLC | Political advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues		6		9
Sinclair Broadcast Group, LLC | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues		37		74
Sinclair Broadcast Group, LLC | Operating Segments | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	750	699	1,477	1,404
Sinclair Broadcast Group, LLC | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenues		47		119
Sinclair Broadcast Group, LLC | Operating Segments | Distribution revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	384	372	768	753
Sinclair Broadcast Group, LLC | Operating Segments | Distribution revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues		31		76
Sinclair Broadcast Group, LLC | Operating Segments | Core advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	285	287	569	580
Sinclair Broadcast Group, LLC | Operating Segments | Core advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues		13		29
Sinclair Broadcast Group, LLC | Operating Segments | Political advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	40	6	64	9
Sinclair Broadcast Group, LLC | Operating Segments | Political advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Sinclair Broadcast Group, LLC | Operating Segments | Other media, non-media, and intercompany revenues | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	$ 41	34	$ 76	62
Sinclair Broadcast Group, LLC | Operating Segments | Other media, non-media, and intercompany revenues | Other
Disaggregation of Revenue [Line Items]
Total revenues		3		14
Sinclair Broadcast Group, LLC | Eliminations
Disaggregation of Revenue [Line Items]
Total revenues		(3)		(7)
Sinclair Broadcast Group, LLC | Eliminations | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Sinclair Broadcast Group, LLC | Eliminations | Core advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues		(3)		(5)
Sinclair Broadcast Group, LLC | Eliminations | Political advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Sinclair Broadcast Group, LLC | Eliminations | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues		$ 0		$ (2)