Note 13 - Segment Information - Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue (less agency commissions)	$ 544	$ 534
Operating expenses before depreciation, amortization and gain on disposal of assets, net:	396	369
Depreciation and amortization	51	47
Gain on disposal of assets, net	(4)	(6)
Operating expenses	443	410
Operating income (loss)	101	124
Interest expense	48	52
Capital expenditures (excluding business combinations)	13	27
Goodwill	1,466		$ 1,460
Total Assets	7,660		7,643
Corporate, Non-Segment [Member]
Revenue (less agency commissions)	0	0
Operating expenses before depreciation, amortization and gain on disposal of assets, net:	18	15
Depreciation and amortization	1	1
Gain on disposal of assets, net	0	0
Operating expenses	19	16
Operating income (loss)	(19)	(16)
Interest expense	48	52
Capital expenditures (excluding business combinations)	0	0
Goodwill	0		0
Total Assets	924		871
Broadcasting, Segment [Member]
Revenue (less agency commissions)	530	515
Operating expenses before depreciation, amortization and gain on disposal of assets, net:	361	335
Depreciation and amortization	47	43
Gain on disposal of assets, net	(4)	(6)
Operating expenses	404	372
Operating income (loss)	126	143
Interest expense	0	0
Capital expenditures (excluding business combinations)	13	27
Goodwill	1,425		1,419
Total Assets	6,613		6,631
Production Companies, Segment [Member]
Revenue (less agency commissions)	14	19
Operating expenses before depreciation, amortization and gain on disposal of assets, net:	17	19
Depreciation and amortization	3	3
Gain on disposal of assets, net	0	0
Operating expenses	20	22
Operating income (loss)	(6)	(3)
Interest expense	0	0
Capital expenditures (excluding business combinations)	0	$ 0
Goodwill	41		41
Total Assets	$ 123		$ 141