The number of properties owned via an International joint venture.

No definition available.

Name:	spg_InternationalJointVentureProperties
Namespace Prefix:	spg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of properties owned via a joint venture in which daily operations are managed by groups other than the entity.

+ References

No definition available.

+ Details

Name:	spg_JointVenturePropertiesManagedByOthers
Namespace Prefix:	spg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of properties owned via a joint venture in which daily operations are managed by the entity.

+ References

No definition available.

+ Details

Name:	spg_JointVenturePropertiesManagedNumber
Namespace Prefix:	spg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of properties owned via a joint venture and accounted for using the equity method of accounting.

+ References

No definition available.

+ Details

Name:	spg_JointVenturePropertiesNumber
Namespace Prefix:	spg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=spg_EuropeanJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=spg_PremiumOutletCentersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_RealEstatePropertiesAxis=us-gaap_WhollyOwnedPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=us-gaap_PartiallyOwnedPropertiesMember
Namespace Prefix:
Data Type:	na
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Period Type:

Basis of Presentation (Details) - property	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Real Estate Properties
Total number of joint venture properties	80
Number of joint venture properties managed by the entity	58
Number of International joint venture properties	19
Number of joint venture properties managed by others	22
Ownership interest:
Ownership percentage in the Operating Partnership	85.70%	85.50%
European Joint Venture \| Premium Outlets
Real Estate Properties
Number of properties	5
Weighted average
Ownership interest:
Ownership percentage in the Operating Partnership	85.60%		85.50%
Wholly owned properties
Real Estate Properties
Number of properties	135
Partially owned properties
Real Estate Properties
Number of properties	13