Deferred Compensation Assets, Fair Value Disclosure

No definition available.

Name:	sbgi_DeferredCompensationAssetsFairValueDisclosure
Namespace Prefix:	sbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Deferred Compensation Liabilities, Fair Value Disclosure

+ References

No definition available.

+ Details

Name:	sbgi_DeferredCompensationLiabilitiesFairValueDisclosure
Namespace Prefix:	sbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Investment, Maximum Ownership Percentage

+ References

No definition available.

+ Details

Name:	sbgi_InvestmentMaximumOwnershipPercentage
Namespace Prefix:	sbgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

+ Details

Name:	us-gaap_EquitySecuritiesFvNi
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of other liabilities.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherLiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Nov. 18, 2020	Mar. 31, 2021	Dec. 31, 2020
FAIR VALUE MEASUREMENTS:
Investments in equity securities		$ 88	$ 68
Debt discount and deferred financing costs		176	183
Level 1 \| Carrying Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities		88	68
Deferred compensation assets		46	42
Deferred compensation liabilities		38	36
Level 1 \| Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities		88	68
Deferred compensation assets		46	42
Deferred compensation liabilities		38	36
Level 2 \| Carrying Value \| Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		16	17
Level 2 \| Carrying Value \| Debt of non-media subsidiaries
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		17	17
Level 2 \| Fair Value \| Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		16	17
Level 2 \| Fair Value \| Debt of non-media subsidiaries
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		17	17
Level 3 \| Carrying Value \| Options and Warrants
FAIR VALUE MEASUREMENTS:
Options and warrants		435	332
Level 3 \| Fair Value \| Options and Warrants
FAIR VALUE MEASUREMENTS:
Options and warrants		$ 435	332
Senior Notes \| 5.875% Senior Unsecured Notes due 2026
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.875%
Senior Notes \| 5.125% Senior Unsecured 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%
Senior Notes \| STG 5.500% Unsecured Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.50%
Senior Notes \| DSG 12.750% Secured Notes Due 2026
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		12.75%
Senior Notes \| DSG 6.625% Unsecured Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		6.625%
Senior Notes \| DSG 5.375% Secured Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.375%
Senior Notes \| Level 2 \| Carrying Value \| 5.875% Senior Unsecured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		$ 348	348
Senior Notes \| Level 2 \| Carrying Value \| 5.500% Senior Unsecured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		500	500
Senior Notes \| Level 2 \| Carrying Value \| 5.125% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		400	400
Senior Notes \| Level 2 \| Carrying Value \| 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		750	750
Senior Notes \| Level 2 \| Carrying Value \| 12.750% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		31	31
Senior Notes \| Level 2 \| Carrying Value \| 6.625% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,744	1,744
Senior Notes \| Level 2 \| Carrying Value \| 5.375% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		3,050	3,050
Senior Notes \| Level 2 \| Fair Value \| 5.875% Senior Unsecured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		356	358
Senior Notes \| Level 2 \| Fair Value \| 5.500% Senior Unsecured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		487	520
Senior Notes \| Level 2 \| Fair Value \| 5.125% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		391	408
Senior Notes \| Level 2 \| Fair Value \| 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		723	770
Senior Notes \| Level 2 \| Fair Value \| 12.750% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		27	28
Senior Notes \| Level 2 \| Fair Value \| 6.625% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		921	1,056
Senior Notes \| Level 2 \| Fair Value \| 5.375% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		2,196	2,483
Term Loan \| Level 2 \| Carrying Value \| Term Loan B
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,119	1,119
Term Loan \| Level 2 \| Carrying Value \| Term Loan B-2
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,281	1,284
Term Loan \| Level 2 \| Carrying Value \| Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		3,251	3,259
Term Loan \| Level 2 \| Fair Value \| Term Loan B
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,107	1,107
Term Loan \| Level 2 \| Fair Value \| Term Loan B-2
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,258	1,264
Term Loan \| Level 2 \| Fair Value \| Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		2,243	2,884
Line of Credit Facility \| Level 2 \| Carrying Value \| A/R Facility
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		173	177
Line of Credit Facility \| Level 2 \| Fair Value \| A/R Facility
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		173	177
STG Money Market Funds \| Level 1 \| Carrying Value
FAIR VALUE MEASUREMENTS:
Money market funds		495	448
STG Money Market Funds \| Level 1 \| Fair Value
FAIR VALUE MEASUREMENTS:
Money market funds		495	448
DSG Money Market Funds \| Level 1 \| Carrying Value
FAIR VALUE MEASUREMENTS:
Money market funds		160	292
DSG Money Market Funds \| Level 1 \| Fair Value
FAIR VALUE MEASUREMENTS:
Money market funds		$ 160	$ 292
Bally's
FAIR VALUE MEASUREMENTS:
Option purchase price, minimum	$ 30
Option purchase price, maximum	$ 45
Precluded from owning more than percentage	4.90%
Bally's \| Options and Warrants
FAIR VALUE MEASUREMENTS:
Discount for lack of marketability		0.25
Measurement adjustments		$ 103