Note 3 - Acquisitions and Divestitures - Unaudited Pro Forma Results (Details) - Raycom [Member] $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares
Revenue (less agency commissions)	$ 2,139
Net income	241
Net income attributable to common stockholders	$ 189
Basic net income attributable to common stockholders, per share (in dollars per share) | $ / shares	$ 2.43
Diluted net income attributable to common stockholders, per share (in dollars per share) | $ / shares	$ 2.41