Note 11 - Goodwill and Intangible Assets - Changes in Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Goodwill	$ 1,460
Goodwill, Net additions	6
Goodwill	1,466
Broadcast licenses	3,579
Broadcast licenses	3,584
Finite-lived intangible assets	395
Finite-lived intangible assets, Net additions	7
Amortization of Intangible Assets	(26)	$ (26)
Finite-lived intangible assets	376
Total intangible assets net of accumulated amortization	5,434
Total intangible assets net of accumulated amortization, Net additions	18
Total intangible assets net of accumulated amortization	5,426
Goodwill, gross	1,559
Goodwill, impairments	0
Goodwill, gross	1,565
Accumulated goodwill impairment	(99)
Accumulated goodwill impairment	(99)
Broadcast Licenses [Member]
Broadcast licenses	3,579
Broadcast licenses, Net additions	5
Broadcast licenses	$ 3,584