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Equity (Details) (USD $)
In Billions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended
Apr. 02, 2015
Mar. 31, 2015
item
Equity    
Period common stock is authorized to repurchase 24 months  
Partnership agreement of Operating Partnership    
Equity    
Common stock, shares issued   483,154us-gaap_CommonStockSharesIssued
/ spg_TypeOfAgreementAxis
= spg_PartnershipAgreementMember
The number of limited partners who received common stock in exchange for an equal number of units, during the period.   5spg_NumberOfLimitedPartnersIssuedSharesOfCommonStock
/ spg_TypeOfAgreementAxis
= spg_PartnershipAgreementMember
Maximum    
Equity    
Common stock authorized for repurchase 2.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember