Name:	spg_AllocatedShareBasedCompensationExpenseNetOfCapitalization
Namespace Prefix:	spg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The percentage of distributions paid on a unit of the Operating Partnership that participants of the stock-based compensation plan are entitled to receive during the performance period.

No definition available.

Name:	spg_DistributionsPercentageToOperatingPartnershipUnit
Namespace Prefix:	spg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The number of limited partners that exchanged units for shares of common stock.

No definition available.

Name:	spg_LimitedPartnersNumberExchangingUnits
Namespace Prefix:	spg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	spg_LongTermIncentivePerformanceProgramsLineItems
Namespace Prefix:	spg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the number of long term incentive programs approved.

No definition available.

Name:	spg_NumberOfLongTermIncentiveProgramsApproved
Namespace Prefix:	spg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The aggregate grant date fair value of the awards made under the stock-based compensation plan.

No definition available.

Name:	spg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateGrantDateFairValue
Namespace Prefix:	spg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the post performance period service based vesting period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	spg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPostPerformanceServiceVestingPeriod
Namespace Prefix:	spg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of portion of stock-based compensation award for employees vesting at second and third anniversaries of performance period.

No definition available.

Name:	spg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentageAtSecondAndThirdAnniversary
Namespace Prefix:	spg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the portion of stock options for employees vesting on the day prior to the sixth, seventh and eighth anniversaries of grant, subject to continued employment.

No definition available.

Name:	spg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentagePerYear
Namespace Prefix:	spg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Pursuant to the award agreements, the number of equal installments over which the award vests.

No definition available.

Name:	spg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfVestingInstallments
Namespace Prefix:	spg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of years in the performance period for the purpose of setting performance goals for a share-based compensation plan.

No definition available.

Name:	spg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod
Namespace Prefix:	spg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of partnership units exchanged for common stock.

No definition available.

Name:	spg_StockIssuedDuringPeriodSharesFromLimitedPartners
Namespace Prefix:	spg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

Net number of share options (or share units) granted during the period.