Note 13 - Segment Information - Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue (less agency commissions)	$ 604	$ 517	$ 1,589	$ 1,543
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:			1,064	1,126
Depreciation and amortization			147	146
(Gain) loss on disposal of assets, net	(10)	(14)	(23)	(27)
Operating expenses	392	378	1,188	1,245
Operating income	212	139	401	298
Interest expense	45	57	143	173
Capital expenditures (excluding business combinations)			70	73
Goodwill	1,448		1,448		$ 1,446
Total Assets	7,224		7,224		6,972
Corporate, Non-Segment [Member]
Revenue (less agency commissions)			0	0
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:			47	83
Depreciation and amortization			2	2
(Gain) loss on disposal of assets, net			0	0
Operating expenses			49	85
Operating income			(49)	(85)
Interest expense			143	173
Capital expenditures (excluding business combinations)			0	4
Goodwill	0		0		0
Total Assets	577		577		289
Broadcasting, Segment [Member]
Revenue (less agency commissions)	593	501	1,557	1,481
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:			985	986
Depreciation and amortization			136	135
(Gain) loss on disposal of assets, net			(21)	(27)
Operating expenses			1,100	1,094
Operating income			457	387
Interest expense			0	0
Capital expenditures (excluding business combinations)			69	69
Goodwill	1,408		1,408		1,405
Total Assets	6,508		6,508		6,530
Production Companies, Segment [Member]
Revenue (less agency commissions)	11	$ 16	32	62
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:			32	57
Depreciation and amortization			9	9
(Gain) loss on disposal of assets, net			(2)	0
Operating expenses			39	66
Operating income			(7)	(4)
Interest expense			0	0
Capital expenditures (excluding business combinations)			1	$ 0
Goodwill	40		40		41
Total Assets	$ 139		$ 139		$ 153