NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Information - Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Lessee, Lease, Description [Line Items]
Leased assets obtained in exchange for new operating lease liabilities	$ 3	$ 2
Leased assets obtained in exchange for new finance lease liabilities		7
Property and equipment purchases	5	5
Shares received in exchange for equivalent value of advertising spots	8	3
Sinclair Broadcast Group, LLC
Lessee, Lease, Description [Line Items]
Leased assets obtained in exchange for new operating lease liabilities	3	2
Leased assets obtained in exchange for new finance lease liabilities		7
Property and equipment purchases	5	5
Shares received in exchange for equivalent value of advertising spots	8	3
(Distributions to) contributions from member, net	31
Proceeds from contributions from member		32
Sinclair Broadcast Group, LLC \| Dividends To Shareholders And Parent Company Expenses
Lessee, Lease, Description [Line Items]
(Distributions to) contributions from member, net	$ 30	25
Sinclair Broadcast Group, LLC \| Funding Of DSG Litigation
Lessee, Lease, Description [Line Items]
Proceeds from contributions from member		$ 50

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