Note 3 - Acquisitions and Divestitures - Transaction Related Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Transaction related expenses	$ 79	$ 11
Broadcast Licenses [Member]
Transaction related expenses	45	3
Corporate and Administrative [Member]
Transaction related expenses	34	8
Legal, Consulting and Other Professional Fees [Member]
Transaction related expenses	24	8
Incentive Compensation and Severance Costs [Member]
Transaction related expenses	21	3
Termination of Sales Representation Agreements [Member]
Transaction related expenses	$ 34	$ 0