CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS AND MEMBER'S DEFICIT - USD ($) $ in Millions	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Sinclair Broadcast Group, LLC	Sinclair Broadcast Group, LLC Common Stock Class A Common Stock	Sinclair Broadcast Group, LLC Common Stock Class B Common Stock	Sinclair Broadcast Group, LLC Additional Paid-In Capital	Sinclair Broadcast Group, LLC Retained Earnings (Accumulated Deficit)	Sinclair Broadcast Group, LLC Accumulated Other Comprehensive Income (Loss)	Sinclair Broadcast Group, LLC Noncontrolling Interests
Beginning balance at Dec. 31, 2022	$ 194									$ 194
Increase (Decrease) in Temporary Equity
Repurchase of redeemable subsidiary preferred equity	(190)									(190)
Net (loss) income	(4)									(4)
Ending balance at Mar. 31, 2023	0									0
Beginning balance (in shares) at Dec. 31, 2022				45,847,879	23,775,056						45,847,879	23,775,056
Beginning balance at Dec. 31, 2022	681			$ 1	$ 0	$ 624	$ 122	$ 1	$ (67)	681	$ 1	$ 0	$ 624	$ 122	$ 1	$ (67)
Increase (Decrease) in Stockholders' Equity
Dividends declared and paid on Old Sinclair Class A and Class B Common Stock	(18)						(18)			(18)				(18)
Repurchases of Old Sinclair Class A Common Stock (in shares)				(3,583,213)							(3,583,213)
Repurchases of Old Sinclair Class A Common Stock	(53)					(53)				(53)			(53)
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans (in shares)				2,095,836							2,095,836
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans	31					31				31			31
Distributions to noncontrolling interests	(4)								(4)	(4)						(4)
Other comprehensive (loss) income	(3)							(3)		(3)					(3)
Net (loss) income	197						185		12	197				185		12
Ending balance (in shares) at Mar. 31, 2023				44,360,502	23,775,056						44,360,502	23,775,056
Ending balance at Mar. 31, 2023	831			$ 1	$ 0	602	289	(2)	(59)	831	$ 1	$ 0	$ 602	289	(2)	(59)
Increase (Decrease) in Temporary Equity
Net (loss) income	0									0
Beginning balance (in shares) at Dec. 31, 2023		39,737,682	23,775,056	39,737,682	23,775,056
Beginning balance at Dec. 31, 2023	221			$ 1	$ 0	517	(234)	1	(64)	(928)				(865)	1	(64)
Increase (Decrease) in Stockholders' Equity
Dividends declared and paid on Old Sinclair Class A and Class B Common Stock	(16)						(16)
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans (in shares)				2,567,641
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans	37					37
Contributions from member, net										65				65
Distributions to noncontrolling interests	(2)								(2)	(2)						(2)
Other comprehensive (loss) income	4							4		4					4
Net (loss) income	25						23		2	6				5		1
Ending balance (in shares) at Mar. 31, 2024		42,305,323	23,775,056	42,305,323	23,775,056
Ending balance at Mar. 31, 2024	$ 269			$ 1	$ 0	$ 554	$ (227)	$ 5	$ (64)	$ (855)				$ (795)	$ 5	$ (65)