FAIR VALUE MEASUREMENTS - Schedule of Level 3 Activity (Details) - Level 3 - Carrying Value - Options and Warrants - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	$ 282	$ 332
Measurement adjustments	(56)	103
Fair value at end of period	$ 226	$ 435

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Measurement Adjustments

No definition available.

Name:	sbgi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityMeasurementAdjustments
Namespace Prefix:	sbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration