Payments Of Dividends, Temporary Equity

No definition available.

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

- Definition

Redeemable Noncontrolling Interest, Equity, Other, Term Of Redemption Period

+ References

No definition available.

+ Details

Name:	sbgi_RedeemableNoncontrollingInterestEquityOtherTermOfRedemptionPeriod
Namespace Prefix:	sbgi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Basis Spread Cap On Variable Rate

+ References

No definition available.

+ Details

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

- Definition

Temporary Equity, Basis Spread On Variable Rate

+ References

No definition available.

+ Details

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

- Definition

Temporary Equity, Dividend Rate, Rate Increase

+ References

No definition available.

+ Details

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

- Definition

Temporary Equity, Dividend Rate, Rate Increase Each Six Months Thereafter

+ References

No definition available.

+ Details

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

- Definition

Temporary Equity, Dividend Rate, Rate Increase From No Redemption

+ References

No definition available.

+ Details

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

- Definition

Temporary Equity, Dividend Rate, Rate Step-Ups Per Annum

+ References

No definition available.

+ Details

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

- Definition

Temporary Equity, Percent Of Dividend Required To Redeem

+ References

No definition available.

+ Details

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

- Definition

Temporary Equity, Redemption Price, Percentage

+ References

No definition available.

+ Details

Name:	sbgi_TemporaryEquityRedemptionPricePercentage
Namespace Prefix:	sbgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Right Of Parent To Purchase If Non-Controlling Equity Holder Does Not Redeem, Value

+ References

No definition available.

+ Details

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

- Definition

Temporary Equity, Undistributed Noncontrolling Interest Income

+ References

No definition available.

+ Details

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

- Definition

Amount of noncontrolling interests which are redeemable by the parent entity, classified as other equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (12)(c)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 15
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (16)(c)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 14
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

+ Details

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

- Definition

Redemption value, as if currently redeemable, of redeemable noncontrolling interest for other shares, units or ownership interests classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date.

+ References

+ Details

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

- Definition

As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 14
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (12)(c)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 15
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (16)(c)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

+ Details

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

- Definition

Redemption value, as if currently redeemable, of redeemable noncontrolling interest for preferred shares, units or ownership interests classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date.

+ References

+ Details

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

- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

+ Details

Name:	us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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

- Definition

The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ 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 210.5-02.28(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (27)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_TemporaryEquityRedemptionPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of new stock classified as temporary equity issued during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	sbgi_TemporaryEquityRedemptionPeriodAxis=sbgi_TemporaryEquityRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbgi_TemporaryEquityRedemptionPeriodAxis=sbgi_TemporaryEquityRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbgi_TemporaryEquityRedemptionPeriodAxis=sbgi_TemporaryEquityRedemptionPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbgi_TemporaryEquityRedemptionPeriodAxis=sbgi_TemporaryEquityRedemptionPeriodFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbgi_TemporaryEquityRedemptionPeriodAxis=sbgi_TemporaryEquityRedemptionPeriodFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbgi_TemporaryEquityRedemptionPeriodAxis=sbgi_TemporaryEquityRedemptionPeriodSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=sbgi_LondonInterbankOfferedRateLIBORFloorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=sbgi_LondonInterbankOfferedRateLIBORPaidInKindMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbgi_TemporaryEquityPeriodAxis=sbgi_TemporaryEquityPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbgi_TemporaryEquityPeriodAxis=sbgi_TemporaryEquityPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbgi_TemporaryEquityPeriodAxis=sbgi_TemporaryEquityPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_RedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

REDEEMABLE NONCONTROLLING INTERESTS (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Jan. 21, 2020	Dec. 13, 2019	Aug. 23, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 31, 2020
Temporary Equity [Line Items]
Issuance of redeemable subsidiary preferred equity, net of issuance costs			$ 1,025	$ 985
Liquidation preference (in dollars per share)			$ 1,000
Redemption price, percent		100.00%	100.00%
Aggregate liquidation preference			$ 1,025
Percent of dividend required to redeem			75.00%
Dividends accrued during the period				33	$ 0	$ 0
Redeemable subsidiary preferred equity				700
Aggregate redemption price		$ 300
Term of redemption period			30 days
Redeemable noncontrolling interests				378
Right to purchase the interest, fair market sale value				376
Undistributed NCI income				2
November 22, 2019 to February 19, 2020
Temporary Equity [Line Items]
Redemption price, percent			100.00%
February 20, 2020 to August 22, 2020
Temporary Equity [Line Items]
Redemption price, percent			102.00%
August 23, 2020 to August 22, 2021
Temporary Equity [Line Items]
Redemption price, percent			103.00%
August 23, 2021 to August 22, 2022
Temporary Equity [Line Items]
Redemption price, percent			103.00%
August 23, 2022 to August 22, 2023
Temporary Equity [Line Items]
Redemption price, percent			101.00%
August 23, 2023 and Thereafter
Temporary Equity [Line Items]
Redemption price, percent			100.00%
London Interbank Offered Rate (LIBOR), Floor
Temporary Equity [Line Items]
Basis spread on variable rate			0.75%
LIBOR
Temporary Equity [Line Items]
Basis spread on variable rate			7.50%
London Interbank Offered Rate (LIBOR), Paid In Kind
Temporary Equity [Line Items]
Basis spread on variable rate			8.00%
August 23, 2019
Temporary Equity [Line Items]
Dividend rate step-ups per annum			0.50%
August 23, 2019 \| LIBOR
Temporary Equity [Line Items]
Basis spread cap on variable rate			10.50%
February 23, 2028
Temporary Equity [Line Items]
Dividend rate increase			1.50%
Dividend rate increase each six months thereafter			0.50%
Dividend rate increase if no redemption occurs			2.00%
February 23, 2028 \| LIBOR
Temporary Equity [Line Items]
Basis spread cap on variable rate			14.00%
30-Day Period Following January 2, 2020
Temporary Equity [Line Items]
Non-controlling equity holder right to sell, fair market sale value				$ 376
Subsequent Event
Temporary Equity [Line Items]
Redemption price, percent	100.00%
Aggregate redemption price	$ 200
Right to purchase the interest, fair market sale value							$ 376
Redeemable Subsidiary Preferred Equity
Temporary Equity [Line Items]
Number of units redeemed (in shares)		300,000
Redeemable Subsidiary Preferred Equity \| Subsequent Event
Temporary Equity [Line Items]
Number of units redeemed (in shares)	200,000