Note 10 - Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax liabilities:
Net book value of property and equipment	$ 92	$ 83
Broadcast licenses, goodwill and other intangible assets	878	869
Total deferred tax liabilities	970	952
Deferred tax assets:
Liability for accrued vacation	4	3
Liability for accrued bonus	5	7
Deferred payroll taxes	3	0
Allowance for credit losses	3	3
Liability for pension plan	11	10
Federal operating loss carryforwards	38	87
State and local operating loss carryforwards	21	31
Acquisition costs	2	2
Restricted stock	4	4
Investments	4	4
Interest expense limitation	4	4
Other	1	1
Total deferred tax assets	100	156
Valuation allowance for deferred tax assets	(15)	(14)
Net deferred tax assets	85	142
Deferred tax liabilities, net of deferred tax assets	$ 885	$ 810