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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.

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

No definition available.

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

No definition available.

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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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

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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).

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

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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

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

No definition available.

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

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)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Percentage of vesting of share-based compensation awards.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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Name:	us-gaap_TitleOfIndividualAxis=spg_NonEmployeeDirectorsMember
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Data Type:	na
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Name:	us-gaap_AwardTypeAxis=spg_LTIPRetentionAwardChairmanAndCEOMember
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Data Type:	na
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Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
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Data Type:	na
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Name:	us-gaap_PlanNameAxis=spg_LongTermIncentivePerformanceProgramsMember
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Data Type:	na
Balance Type:
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Name:	us-gaap_PlanNameAxis=spg_LongTermIncentivePerformanceProgramOneYearMember
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Data Type:	na
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Name:	us-gaap_PlanNameAxis=spg_LongTermIncentivePerformanceProgramTwoYearMember
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Data Type:	na
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Name:	us-gaap_PlanNameAxis=spg_LongTermIncentivePerformanceProgramThreeYearMember
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Data Type:	na
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Name:	us-gaap_PlanNameAxis=spg_LongTermIncentivePerformanceProgram2011Member
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