CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 26	$ 151
Share of other comprehensive income of equity method investments	8	0
Comprehensive income	34	151
Comprehensive income attributable to the redeemable noncontrolling interests	(4)	(20)
Comprehensive income attributable to the noncontrolling interests	(34)	(8)
Comprehensive (loss) income attributable to Sinclair Broadcast Group	$ (4)	$ 123