Note 13 - Goodwill and Intangible Assets - Changes in Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill	$ 1,446	$ 612
Goodwill, Net additions	14	834
Goodwill	1,460	1,446	$ 612
Broadcast licenses	3,573
Broadcast licenses	3,579	3,573
Finite-lived intangible assets	460	53
Finite-lived Intangible Assets Acquired	40	522
Amortization of Intangible Assets	(105)	(115)	(21)
Finite-lived intangible assets	395	460	53
Total intangible assets net of accumulated amortization	5,479	2,195
Total intangible assets net of accumulated amortization, Net additions	60	3,399
Total intangible assets net of accumulated amortization	5,434	5,479	2,195
Broadcast Licenses [Member]
Broadcast licenses	3,573	1,530
Indefinite-lived Intangible Assets Acquired	6	2,043
Broadcast licenses	$ 3,579	$ 3,573	$ 1,530