Date of senior secured term loan agreement.

No definition available.

Name:	srg_DateOfSeniorSecuredTermLoanAgreement
Namespace Prefix:	srg_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument extended maturity term.

+ References

No definition available.

+ Details

Name:	srg_DebtInstrumentExtendedMaturityTerm
Namespace Prefix:	srg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument principal reduction amount by maturity date.

+ References

No definition available.

+ Details

Name:	srg_DebtInstrumentPrincipalReductionAmountByMaturityDate
Namespace Prefix:	srg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Default interest rate on overdue amounts excess of base interest rate.

+ References

No definition available.

+ Details

Name:	srg_DefaultInterestRateOnOverdueAmountsExcessOfBaseInterestRate
Namespace Prefix:	srg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Deferred payment obligation, interest payment.

+ References

No definition available.

+ Details

Name:	srg_DeferredPaymentObligationInterestPayment
Namespace Prefix:	srg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fixed charge coverage ratio to each fiscal quarter after three years.

+ References

No definition available.

+ Details

Name:	srg_FixedChargeCoverageRatioToEachFiscalQuarterAfterThreeYears
Namespace Prefix:	srg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed charge coverage ratio to each fiscal quarter for next three years.

+ References

No definition available.

+ Details

Name:	srg_FixedChargeCoverageRatioToEachFiscalQuarterForNextThreeYears
Namespace Prefix:	srg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility extended expiration date.

+ References

No definition available.

+ Details

Name:	srg_LineOfCreditFacilityExtendedExpirationDate
Namespace Prefix:	srg_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility leverage ratio.

+ References

No definition available.

+ Details

Name:	srg_LineOfCreditFacilityLeverageRatio
Namespace Prefix:	srg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum net worth required for loan documentation.

+ References

No definition available.

+ Details

Name:	srg_MinimumNetWorthRequiredForLoanDocumentation
Namespace Prefix:	srg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Minimum rental income to achieve from tenants for succeeding four consecutive fiscal quarters to access incremental funding facility.

+ References

No definition available.

+ Details

Name:	srg_MinimumRentalIncomeToAchieveFromTenantsForSucceedingFourConsecutiveFiscalQuartersToAccessIncrementalFundingFacility
Namespace Prefix:	srg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum rental income to achieve from tenants on annual basis to access incremental funding facility.

+ References

No definition available.

+ Details

Name:	srg_MinimumRentalIncomeToAchieveFromTenantsOnAnnualBasisToAccessIncrementalFundingFacility
Namespace Prefix:	srg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unencumbered fixed charge coverage ratio.

+ References

No definition available.

+ Details

Name:	srg_UnencumberedFixedChargeCoverageRatio
Namespace Prefix:	srg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Unencumbered fixed charge coverage ratio to each fiscal quarter for after three years.

+ References

No definition available.

+ Details

Name:	srg_UnencumberedFixedChargeCoverageRatioToEachFiscalQuarterAfterThreeYears
Namespace Prefix:	srg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Unencumbered fixed charge coverage ratio to each fiscal quarter for next three years.

+ References

No definition available.

+ Details

Name:	srg_UnencumberedFixedChargeCoverageRatioToEachFiscalQuarterForNextThreeYears
Namespace Prefix:	srg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 45
-Paragraph 20
-URI https://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 45
-Paragraph 21
-URI https://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

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 (SX 210.5-02.22(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

+ Details

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

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

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

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=srg_TermLoanFacilityMember
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_LineOfCreditFacilityAxis=srg_BerkshireHathawayLifeInsuranceCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=srg_UnrestrictedCashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=srg_InitialFundingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=srg_IncrementalFundingFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Additional Information (Detail) - Term Loan Facility [Member] - USD ($)					1 Months Ended	6 Months Ended
	Dec. 31, 2021	Nov. 24, 2021	May 05, 2020	Jul. 31, 2018	Aug. 05, 2022	Jun. 30, 2022	Aug. 08, 2022
Debt Instrument [Line Items]
Principal amount outstanding						$ 1,440,000,000
Repayments of unpaid principal balance	$ 160,000,000
Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount outstanding							$ 1,340,000,000
Berkshire Hathaway [Member]
Debt Instrument [Line Items]
Date of senior secured term loan agreement				Jul. 31, 2018
Principal amount outstanding				$ 2,000,000,000.0
Line of credit, maturity date						Jul. 31, 2023
Line of credit, extended maturity date						Jul. 31, 2025
Minimum rental income to achieve from tenants on annual basis to access incremental funding facility						$ 200,000,000
Minimum rental income to achieve from tenants for succeeding four consecutive fiscal quarters to access incremental funding facility						200,000,000
Minimum net worth required for loan documentation						$ 1,200,000,000
Default interest rate on overdue amounts excess of base interest rate			2.00%			2.00%
Debt issuance costs						$ 2,100,000
Unamortized debt issuance costs	$ 700,000					$ 500,000
Deferred interest			$ 400,000,000.0
Debt instrument extended maturity term		2 years
Principal reduced by maturity date		$ 800,000,000
Berkshire Hathaway [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio for each fiscal quarter till March 31, 2022						1.00%
Fixed charge coverage ratio for each fiscal quarter after March 31, 2022						1.20%
Unencumbered fixed charge coverage ratio for each fiscal quarter till March 31, 2022						1.05%
Unencumbered fixed charge coverage ratio to each fiscal quarter after March 31, 2022						1.30%
Berkshire Hathaway [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Unencumbered fixed charge coverage ratio						60.00%
Maximum leverage ratio						65.00%
Berkshire Hathaway [Member] \| Maximum [Member] \| Unrestricted Cash [Member]
Debt Instrument [Line Items]
Available cash			$ 30,000,000.0
Berkshire Hathaway [Member] \| Initial Funding [Member]
Debt Instrument [Line Items]
Principal amount outstanding				1,600,000,000
Debt instrument, base annual interest rate						7.00%
Berkshire Hathaway [Member] \| Initial Funding [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount outstanding					$ 1,340,000,000
Repayments of unpaid principal balance					$ 100,000,000.0
Berkshire Hathaway [Member] \| Incremental Funding Facility [Member]
Debt Instrument [Line Items]
Principal amount outstanding				$ 400,000,000.0
Debt instrument, base annual interest rate						1.00%