Note 11 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Goodwill, Gross	$ 1,565	$ 1,559
Goodwill	1,466	1,460
Other intangible assets, net	376	395
Total intangible assets	5,822	5,804
Total intangible assets	(396)	(370)
Total intangible assets	5,426	5,434
Network Affiliate [Member]
Finite-Lived Intangible Assets, Gross	67	67
Finite-Lived Intangible Assets, Accumulated Amortization	(31)	(28)
Other intangible assets, net	36	39
Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Gross	651	644
Finite-Lived Intangible Assets, Accumulated Amortization	(311)	(288)
Other intangible assets, net	340	356
Intangible Assets Subject to Amortization [Member]
Finite-Lived Intangible Assets, Gross	718	711
Finite-Lived Intangible Assets, Accumulated Amortization	(342)	(316)
Other intangible assets, net	376	395
Broadcast Licenses [Member]
Indefinite-lived Intangible Assets (Excluding Goodwill), Gross	3,638	3,633
Indefinite-Lived Intangible Assets (Excluding Goodwill), Accumulated Amortization	(54)	(54)
Indefinite-Lived Intangible Assets (Excluding Goodwill)	3,584	3,579
Goodwill Not Amortizable [Member]
Goodwill, Gross	1,466	1,460
Goodwill, Accumulated Amortization	0	0
Goodwill	1,466	1,460
Intangible Assets Not Subject to Amortization [Member]
Goodwill and Indefinite-Lived Intangible Assets, Gross	5,104	5,093
Goodwill and Indefinite-lived Intangible Assets, Accumulated Amortization	(54)	(54)
Goodwill and Indefinite-Lived Assets, Net	$ 5,050	$ 5,039