Note 11 - Goodwill and Intangible Assets - Changes in Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill			$ 1,446
Goodwill, Net additions			2
Goodwill	$ 1,448		1,448
Broadcast licenses			3,573
Broadcast licenses	3,577		3,577
Definite lived intangible assets			460
Definite lived intangible assets			9
Amortization of Intangible Assets	(26)	$ (29)	(78)	$ (86)
Definite lived intangible assets	391		391
Total intangible assets net of accumulated amortization			5,479
Total intangible assets net of accumulated amortization, Net additions			15
Total intangible assets net of accumulated amortization	5,416		5,416
Broadcast Licenses [Member]
Broadcast licenses			3,573
Broadcast licenses, Net additions			4
Broadcast licenses	$ 3,577		$ 3,577