Note 3 - Acquisitions and Divestitures - Transaction Related Expenses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Transaction related expenses	$ 11	$ 26
Broadcast Licenses [Member]
Transaction related expenses	0	0
Corporate and Administrative [Member]
Transaction related expenses	11	19
Miscellaneous (Income) Expense, Net [Member]
Transaction related expenses	0	7
Legal, Consulting and Other Professional Fees [Member]
Transaction related expenses	11	19
Incentive Compensation and Severance Costs [Member]
Transaction related expenses	0	0
Termination of Sales Representation Agreements [Member]
Transaction related expenses	$ 0	$ 7