Note 14 - Segment Information - Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue (less agency commissions)	$ 792	$ 604	$ 451	$ 534	$ 579	$ 517	$ 508	$ 518	$ 2,381	$ 2,122	$ 1,084
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:									1,457	1,503	637
Depreciation and amortization									201	195	75
(Gain) loss on disposal of assets, net									(29)	(54)	(17)
Total operating expenses									1,629	1,644	695
Operating income	351	$ 212	$ 65	$ 124	180	$ 139	$ 119	$ 40	752	478	389
Interest expense									191	227	107
Capital expenditures (excluding business combinations)									110	110	70
Goodwill	1,460				1,446				1,460	1,446	612
Total assets	7,643				6,972				7,643	6,972	4,213
Corporate, Non-Segment [Member]
Revenue (less agency commissions)									0	0	0
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:									65	104	41
Depreciation and amortization									3	2	1
(Gain) loss on disposal of assets, net									0	0	0
Total operating expenses									68	106	42
Operating income									(68)	(106)	(42)
Interest expense									191	227	107
Capital expenditures (excluding business combinations)									0	5	2
Goodwill	0				0				0	0	0
Total assets	871				289				871	289	1,450
Broadcasting, Segment [Member]
Revenue (less agency commissions)									2,320	2,035	1,084
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:									1,340	1,325	596
Depreciation and amortization									186	180	74
(Gain) loss on disposal of assets, net									(31)	(54)	(17)
Total operating expenses									1,495	1,451	653
Operating income									825	584	431
Interest expense									0	0	0
Capital expenditures (excluding business combinations)									106	104	68
Goodwill	1,419				1,405				1,419	1,405	612
Total assets	6,631				6,530				6,631	6,530	2,763
Production Companies, Segment [Member]
Revenue (less agency commissions)									61	87	0
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:									52	74	0
Depreciation and amortization									12	13	0
(Gain) loss on disposal of assets, net									2	0	0
Total operating expenses									66	87	0
Operating income									(5)	0	0
Interest expense									0	0	0
Capital expenditures (excluding business combinations)									4	1	0
Goodwill	41				41				41	41	0
Total assets	$ 141				$ 153				$ 141	$ 153	$ 0