Segment Information - Narrative (Detail) $ in Billions	3 Months Ended
	Dec. 31, 2021 USD ($) Fullpowertvstation duopoly
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Segment Reporting Information [Line Items]
Revenue, remaining performance obligation, amount | $	$ 4.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01 | Minimum
Segment Reporting Information [Line Items]
Future performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01 | Maximum
Segment Reporting Information [Line Items]
Future performance obligation, expected timing of satisfaction, period	3 years
Television | US
Segment Reporting Information [Line Items]
Full power broadcast television stations	29
Duopolies | duopoly	11
FOX Network | Television | US
Segment Reporting Information [Line Items]
Full power broadcast television stations	18
MyNetworkTV | Television | US
Segment Reporting Information [Line Items]
Full power broadcast television stations	10
Independent Station | Television | US
Segment Reporting Information [Line Items]
Full power broadcast television stations	1