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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 784	$ 829	$ 1,560	$ 1,627
Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	679	750	1,373	1,477
Distribution revenue
Disaggregation of Revenue [Line Items]
Revenue	434	435	885	871
Core advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	316	303	608	600
Political advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	6	40	12	64
Operating Segments | Local Media
Disaggregation of Revenue [Line Items]
Revenue	679	750	1,373	1,477
Operating Segments | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	679	750	1,373	1,477
Operating Segments | Distribution revenue | Local Media
Disaggregation of Revenue [Line Items]
Revenue	380	384	775	768
Operating Segments | Distribution revenue | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	380	384	775	768
Operating Segments | Core advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Revenue	272	285	543	569
Operating Segments | Core advertising revenue | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	272	285	543	569
Operating Segments | Political advertising revenue | Local Media
Disaggregation of Revenue [Line Items]
Revenue	6	40	12	64
Operating Segments | Political advertising revenue | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	6	40	12	64
Operating Segments | Other media | Local Media | Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	$ 21	$ 41	$ 43	$ 76