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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 773	$ 917	$ 2,333	$ 2,544
Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	667	845	2,040	2,322
Distribution revenue
Disaggregation of Revenue [Line Items]
Revenue	422	434	1,307	1,305
Core advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	315	295	923	895
Political advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	6	138	18	202
Operating Segments | Local Media
Disaggregation of Revenue [Line Items]
Revenue	667	845	2,040	2,322
Operating Segments | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	667	845	2,040	2,322
Operating Segments | Distribution revenue | Local Media
Disaggregation of Revenue [Line Items]
Revenue	370	383	1,145	1,151
Operating Segments | Distribution revenue | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	370	383	1,145	1,151
Operating Segments | Core advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Revenue	269	283	812	852
Operating Segments | Core advertising revenue | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	269	283	812	852
Operating Segments | Political advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Revenue	6	138	18	202
Operating Segments | Political advertising revenue | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	6	138	18	202
Operating Segments | Other media | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	$ 22	$ 41	$ 65	$ 117