NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 798	$ 773
Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	436	426
Core advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	297	306
Political advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	24	3
Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	41	38
Operating Segments | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	727	705
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenues	15	17
Operating Segments | Distribution revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	384	381
Operating Segments | Distribution revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Operating Segments | Core advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	284	293
Operating Segments | Core advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	6	6
Operating Segments | Political advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	24	3
Operating Segments | Political advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Operating Segments | Other media, non-media, and intercompany revenues | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	35	28
Operating Segments | Other media, non-media, and intercompany revenues | Other
Disaggregation of Revenue [Line Items]
Total revenues	9	11
Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	(7)	(4)
Eliminations | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Eliminations | Core advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	(3)	(2)
Eliminations | Political advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Eliminations | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues	(4)	(2)
Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Total revenues	727	773
Sinclair Broadcast Group, LLC | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues		426
Sinclair Broadcast Group, LLC | Core advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues		306
Sinclair Broadcast Group, LLC | Political advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues		3
Sinclair Broadcast Group, LLC | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues		38
Sinclair Broadcast Group, LLC | Operating Segments | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	727	705
Sinclair Broadcast Group, LLC | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenues		72
Sinclair Broadcast Group, LLC | Operating Segments | Distribution revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	384	381
Sinclair Broadcast Group, LLC | Operating Segments | Distribution revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues		45
Sinclair Broadcast Group, LLC | Operating Segments | Core advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	284	293
Sinclair Broadcast Group, LLC | Operating Segments | Core advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues		15
Sinclair Broadcast Group, LLC | Operating Segments | Political advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	24	3
Sinclair Broadcast Group, LLC | Operating Segments | Political advertising revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues		0
Sinclair Broadcast Group, LLC | Operating Segments | Other media, non-media, and intercompany revenues | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	$ 35	28
Sinclair Broadcast Group, LLC | Operating Segments | Other media, non-media, and intercompany revenues | Other
Disaggregation of Revenue [Line Items]
Total revenues		12
Sinclair Broadcast Group, LLC | Eliminations
Disaggregation of Revenue [Line Items]
Total revenues		(4)
Sinclair Broadcast Group, LLC | Eliminations | Distribution revenue
Disaggregation of Revenue [Line Items]
Total revenues		0
Sinclair Broadcast Group, LLC | Eliminations | Core advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues		(2)
Sinclair Broadcast Group, LLC | Eliminations | Political advertising revenue
Disaggregation of Revenue [Line Items]
Total revenues		0
Sinclair Broadcast Group, LLC | Eliminations | Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Total revenues		$ (2)