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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Goodwill			$ 1,460
Goodwill, Net additions			173
Goodwill	$ 1,633		1,633
Broadcast licenses			3,579
Broadcast licenses	3,784		3,784
Finite-lived intangible assets			395
Finite-lived intangible assets, Net additions			93
Amortization of Intangible Assets	(28)	$ (26)	(81)	$ (78)
Finite-lived intangible assets	407		407
Total intangible assets net of accumulated amortization			5,434
Total intangible assets net of accumulated amortization, Net additions			471
Total intangible assets net of accumulated amortization	5,824		5,824
Goodwill, gross			1,559
Goodwill, impairments			0
Goodwill, gross	1,732		1,732
Accumulated goodwill impairment	(99)		(99)
Broadcast Licenses [Member]
Broadcast licenses			3,579
Broadcast licenses, Net additions			205
Broadcast licenses	$ 3,784		$ 3,784