FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Feb. 07, 2023
FAIR VALUE MEASUREMENTS:
Debt discount and deferred financing costs	$ 38,000,000	$ 46,000,000
Interest Rate Swap
FAIR VALUE MEASUREMENTS:
Interest rate swap	$ 3,000,000
Interest rate swap		1,000,000
Notional amount			$ 600,000,000
Fixed interest rate			3.90%
Senior Notes | 5.500% Senior Notes due 2030
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	5.50%
Senior Notes | 5.125% Senior Notes due 2027
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	5.125%
Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	4.125%
Level 1 | Fair Value | Money market funds
FAIR VALUE MEASUREMENTS:
Money market funds	$ 381,000,000	588,000,000
Level 2 | Face Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	7,000,000	7,000,000
Level 2 | Face Value | Senior Notes | 5.500% Senior Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	485,000,000	485,000,000
Level 2 | Face Value | Senior Notes | 5.125% Senior Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	274,000,000	274,000,000
Level 2 | Face Value | Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	737,000,000	737,000,000
Level 2 | Face Value | Term Loan | Term Loan B-2, due September 30, 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	1,178,000,000	1,215,000,000
Level 2 | Face Value | Term Loan | Term Loan B-3, due April 1, 2028
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	716,000,000	722,000,000
Level 2 | Face Value | Term Loan | Term Loan B-4, due April 21, 2029
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	733,000,000	739,000,000
Level 2 | Fair Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	7,000,000	7,000,000
Level 2 | Fair Value | Senior Notes | 5.500% Senior Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	350,000,000	362,000,000
Level 2 | Fair Value | Senior Notes | 5.125% Senior Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	238,000,000	248,000,000
Level 2 | Fair Value | Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	574,000,000	521,000,000
Level 2 | Fair Value | Term Loan | Term Loan B-2, due September 30, 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	1,116,000,000	1,124,000,000
Level 2 | Fair Value | Term Loan | Term Loan B-3, due April 1, 2028
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	530,000,000	595,000,000
Level 2 | Fair Value | Term Loan | Term Loan B-4, due April 21, 2029
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	543,000,000	602,000,000
Level 2 | Fair Value | Interest Rate Swap
FAIR VALUE MEASUREMENTS:
Interest rate swap	3,000,000
Interest rate swap		1,000,000
Sinclair Broadcast Group, LLC
FAIR VALUE MEASUREMENTS:
Debt discount and deferred financing costs	38,000,000	46,000,000
Sinclair Broadcast Group, LLC | Interest Rate Swap
FAIR VALUE MEASUREMENTS:
Interest rate swap	$ 3,000,000
Interest rate swap		1,000,000
Notional amount			$ 600,000,000
Fixed interest rate			3.90%
Sinclair Broadcast Group, LLC | Senior Notes | 5.500% Senior Notes due 2030
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	5.50%
Sinclair Broadcast Group, LLC | Senior Notes | 5.125% Senior Notes due 2027
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	5.125%
Sinclair Broadcast Group, LLC | Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	4.125%
Sinclair Broadcast Group, LLC | Level 1 | Fair Value | Money market funds
FAIR VALUE MEASUREMENTS:
Money market funds	$ 116,000,000	309,000,000
Sinclair Broadcast Group, LLC | Level 2 | Face Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	7,000,000	7,000,000
Sinclair Broadcast Group, LLC | Level 2 | Face Value | Senior Notes | 5.500% Senior Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	485,000,000	485,000,000
Sinclair Broadcast Group, LLC | Level 2 | Face Value | Senior Notes | 5.125% Senior Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	274,000,000	274,000,000
Sinclair Broadcast Group, LLC | Level 2 | Face Value | Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	737,000,000	737,000,000
Sinclair Broadcast Group, LLC | Level 2 | Face Value | Term Loan | Term Loan B-2, due September 30, 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	1,178,000,000	1,215,000,000
Sinclair Broadcast Group, LLC | Level 2 | Face Value | Term Loan | Term Loan B-3, due April 1, 2028
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	716,000,000	722,000,000
Sinclair Broadcast Group, LLC | Level 2 | Face Value | Term Loan | Term Loan B-4, due April 21, 2029
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	733,000,000	739,000,000
Sinclair Broadcast Group, LLC | Level 2 | Fair Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	7,000,000	7,000,000
Sinclair Broadcast Group, LLC | Level 2 | Fair Value | Senior Notes | 5.500% Senior Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	350,000,000	362,000,000
Sinclair Broadcast Group, LLC | Level 2 | Fair Value | Senior Notes | 5.125% Senior Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	238,000,000	248,000,000
Sinclair Broadcast Group, LLC | Level 2 | Fair Value | Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	574,000,000	521,000,000
Sinclair Broadcast Group, LLC | Level 2 | Fair Value | Term Loan | Term Loan B-2, due September 30, 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	1,116,000,000	1,124,000,000
Sinclair Broadcast Group, LLC | Level 2 | Fair Value | Term Loan | Term Loan B-3, due April 1, 2028
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	530,000,000	595,000,000
Sinclair Broadcast Group, LLC | Level 2 | Fair Value | Term Loan | Term Loan B-4, due April 21, 2029
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	543,000,000	602,000,000
Sinclair Broadcast Group, LLC | Level 2 | Fair Value | Interest Rate Swap
FAIR VALUE MEASUREMENTS:
Interest rate swap	$ 3,000,000
Interest rate swap		$ 1,000,000