CONSOLIDATED STATEMENTS OF MEMBER'S EQUITY (DEFICIT) AND REDEEMABLE NONCONTROLLING INTERESTS - 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 Sep. 30, 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	(50)						(50)			(18)				(18)
Repurchases of Old Sinclair Class A Common Stock (in shares)				(8,785,022)							(8,785,022)
Repurchases of Old Sinclair Class A Common Stock	(153)					(153)				(153)			(153)
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans (in shares)				2,586,402							2,274,558
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans	43					43				40			40
Old Sinclair Class A and Class B Common Stock converted to SBG member's equity (in shares)											(39,337,415)	(23,775,056)
Old Sinclair Class A and Class B Common Stock converted to SBG member's equity										(1)	$ 1
Deemed dividend to parent										(1,138)			(511)	(626)		(1)
Distribution to parent										(52)				(52)
Distributions to noncontrolling interests	(10)								(10)	(10)						(10)
Other comprehensive income (loss)	8							8		8					8
Net (loss) income	65						50		15	77				62		15
Ending balance (in shares) at Sep. 30, 2023				39,649,259	23,775,056						0	0
Ending balance at Sep. 30, 2023	584			$ 1	$ 0	514	122	9	(62)	(566)	$ 0	$ 0	0	(512)	9	(63)
Increase (Decrease) in Temporary Equity
Net (loss) income	0									0
Ending balance at Sep. 30, 2023	0									0
Beginning balance (in shares) at Jun. 30, 2023				39,274,843	23,775,056
Beginning balance at Jun. 30, 2023	641			$ 1	$ 0	510	184	7	(61)	(472)				(418)	7	(61)
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)				374,416
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans	4					4
Deemed dividend to parent										(20)				(20)
Distribution to parent										(52)				(52)
Distributions to noncontrolling interests	(2)								(2)	(3)						(3)
Other comprehensive income (loss)	2							2		2					2
Net (loss) income	(45)						(46)		1	(21)				(22)		1
Ending balance (in shares) at Sep. 30, 2023				39,649,259	23,775,056						0	0
Ending balance at Sep. 30, 2023	584			$ 1	$ 0	514	122	9	(62)	(566)	$ 0	$ 0	$ 0	(512)	9	(63)
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	(49)						(49)
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans (in shares)				2,846,408
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans	48					48
Distributions to member, net/ Contributions from member, net										104				104
Distributions to noncontrolling interests	(8)								(8)	(8)						(8)
Other comprehensive income (loss)	(3)							(3)		(3)					(3)
Net (loss) income	140						134		6	92				87		5
Ending balance (in shares) at Sep. 30, 2024		42,584,090	23,775,056	42,584,090	23,775,056
Ending balance at Sep. 30, 2024	349			$ 1	$ 0	565	(149)	(2)	(66)	(743)				(674)	(2)	(67)
Increase (Decrease) in Temporary Equity
Net (loss) income	0									0
Beginning balance (in shares) at Jun. 30, 2024				42,505,771	23,775,056
Beginning balance at Jun. 30, 2024	275			$ 1	$ 0	560	(227)	6	(65)	(774)				(714)	6	(66)
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)				78,319
Old Sinclair Class A Common Stock issued pursuant to employee benefit plans	5					5
Distributions to member, net/ Contributions from member, net										(40)				(40)
Distributions to noncontrolling interests	(3)								(3)	(3)						(3)
Other comprehensive income (loss)	(8)							(8)		(8)					(8)
Net (loss) income	96						94		2	82				80		2
Ending balance (in shares) at Sep. 30, 2024		42,584,090	23,775,056	42,584,090	23,775,056
Ending balance at Sep. 30, 2024	$ 349			$ 1	$ 0	$ 565	$ (149)	$ (2)	$ (66)	$ (743)				$ (674)	$ (2)	$ (67)