NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 776	$ 798
Distribution revenue
Disaggregation of Revenue [Line Items]
Revenue	451	436
Core advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	292	297
Political advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	6	24
Other media, non-media, and intercompany revenues
Disaggregation of Revenue [Line Items]
Revenue	27	41
Local Media \| Local Media
Disaggregation of Revenue [Line Items]
Revenue	694	727
Local Media \| Local Media \| Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	694	727
Local Media \| Distribution revenue \| Local Media
Disaggregation of Revenue [Line Items]
Revenue	395	384
Local Media \| Distribution revenue \| Local Media \| Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	395	384
Local Media \| Core advertising revenue \| Local Media
Disaggregation of Revenue [Line Items]
Revenue	271	284
Local Media \| Core advertising revenue \| Local Media \| Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	271	284
Local Media \| Political advertising revenue \| Local Media
Disaggregation of Revenue [Line Items]
Revenue	6	24
Local Media \| Political advertising revenue \| Local Media \| Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	6	24
Local Media \| Other media, non-media, and intercompany revenues \| Local Media
Disaggregation of Revenue [Line Items]
Revenue	22	35
Local Media \| Other media, non-media, and intercompany revenues \| Local Media \| Sinclair Broadcast Group, LLC
Disaggregation of Revenue [Line Items]
Revenue	$ 22	$ 35

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details