Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
May. 31, 2010	Mar. 31, 2015
Insurance
Insurance proceeds funded by insurers	$ 50
Minimum insurance coverage	50
Additional insurance proceeds	$ 150
Positive Outcome of Litigation \| Maximum
Insurance
Summary judgment of additional insurance coverage available under excess insurance policy		$ 150

Represents the maximum amount of additional insurance proceeds to be received from insurance provider.

No definition available.

Name:	spg_AdditionalProceedsFromInsuranceSettlementOperatingActivitiesMaximum
Namespace Prefix:	spg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of minimum insurance coverage provided by single insurance provider.

+ References

No definition available.

+ Details

Name:	spg_MinimumInsuranceCoverageBySingleInsuranceProvider
Namespace Prefix:	spg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

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

- Definition

The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to operating activities. It excludes insurance settlements classified as investing cash flows, for example, insurance settlements related to fixed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 16
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3337-108585

+ Details

Name:	us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_GainContingenciesByNatureAxis=us-gaap_PositiveOutcomeOfLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: