NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Business Combinations and Station Disposals (Details) $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition of businesses, net of cash acquired		$ 25	$ 0
Goodwill		2,087		$ 2,082
Held-for-sale | Station Disposals
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset purchase agreement consideration	$ 30
Accounts receivable		9
Property and equipment		23
Accounts payable and accrued liabilities		2
Current portion of program contracts payable		1
Expected loss from disposal		$ 17
CPX Interactive LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition of businesses, net of cash acquired	30
Cash acquired	$ 5
Remaining percentage of business acquired	0.75
Definite-lived intangible assets	$ 22
Goodwill	$ 17