CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (2,429)	$ 105	$ 346
Adjustments to post-retirement obligations, net of taxes	(1)	(1)	1
Share of other comprehensive loss of equity method investments	(7)	0	0
Comprehensive (loss) income	(2,437)	104	347
Comprehensive income attributable to redeemable noncontrolling interests	(56)	(48)	0
Comprehensive loss (income) attributable to noncontrolling interests	71	(10)	(5)
Comprehensive (loss) income attributable to Sinclair Broadcast Group	$ (2,422)	$ 46	$ 342