Note 13 - Segment Information - Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue (less agency commissions)	$ 601	$ 604	$ 1,692	$ 1,589
Operating expenses before depreciation, amortization and loss on disposal of assets, net:			1,213	1,064
Depreciation and amortization			157	147
Loss on disposal of assets, net	51	(10)	46	(23)
Operating expenses	534	392	1,416	1,188
Operating income (loss)	67	212	276	401
Interest expense	48	45	143	143
Capital expenditures (excluding business combinations)			154	70
Goodwill	1,633		1,633		$ 1,460
Total assets	7,779		7,779		7,643
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:			1,213	1,064
Corporate, Non-Segment [Member]
Revenue (less agency commissions)			0	0
Operating expenses before depreciation, amortization and loss on disposal of assets, net:			75	47
Depreciation and amortization			2	2
Loss on disposal of assets, net			0	0
Operating expenses			77	49
Operating income (loss)			(77)	(49)
Interest expense			143	143
Capital expenditures (excluding business combinations)			3	0
Goodwill	0		0		0
Total assets	416		416		871
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:			75	47
Broadcasting, Segment [Member]
Revenue (less agency commissions)	581	593	1,648	1,557
Operating expenses before depreciation, amortization and loss on disposal of assets, net:			1,099	985
Depreciation and amortization			146	136
Loss on disposal of assets, net			46	(21)
Operating expenses			1,291	1,100
Operating income (loss)			357	457
Interest expense			0	0
Capital expenditures (excluding business combinations)			63	69
Goodwill	1,588		1,588		1,419
Total assets	7,229		7,229		6,631
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:			1,099	985
Production Companies, Segment [Member]
Revenue (less agency commissions)	20	$ 11	44	32
Operating expenses before depreciation, amortization and loss on disposal of assets, net:			39	32
Depreciation and amortization			9	9
Loss on disposal of assets, net			0	(2)
Operating expenses			48	39
Operating income (loss)			(4)	(7)
Interest expense			0	0
Capital expenditures (excluding business combinations)			88	1
Goodwill	45		45		41
Total assets	$ 134		134		$ 141
Operating expenses before depreciation, amortization and (gain) loss on disposal of assets, net:			$ 39	$ 32