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Investment in Unconsolidated Entities (Details 3) (USD $)
 3 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 13, 2015
Jan. 15, 2015
Dec. 31, 2014
Feb. 24, 2015
Schedule of Equity Method Investments            
Share of net income, net of amortization of our excess investment $ 64,872,000us-gaap_IncomeLossFromEquityMethodInvestments $ 57,078,000us-gaap_IncomeLossFromEquityMethodInvestments        
Equity investment 2,158,205,000us-gaap_EquityMethodInvestments       2,378,800,000us-gaap_EquityMethodInvestments  
Seritage Growth Properties | Forecast            
Schedule of Equity Method Investments            
Payments to acquire equity method investment     33,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= spg_SeritageGrowthPropertiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		      
Houston Galleria            
Schedule of Equity Method Investments            
Joint venture ownership percentage           50.40%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_HoustonGalleriaMember
Hudson's Bay Company (HBC) Joint Venture | Forecast            
Schedule of Equity Method Investments            
Joint venture ownership percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
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= spg_HudsonBayCompanyJointVentureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		          
Hudson's Bay Company (HBC) Joint Venture | Maximum | Forecast            
Schedule of Equity Method Investments            
Contribution to form joint venture 178,500,000us-gaap_PaymentsToAcquireInterestInJointVenture
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= spg_HudsonBayCompanyJointVentureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		          
Contributions for improvements to properties 100,000,000us-gaap_PaymentsForCapitalImprovements
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= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_HudsonBayCompanyJointVentureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		          
Hudson's Bay Company (HBC) Joint Venture | Hudson Bay Company | Forecast            
Schedule of Equity Method Investments            
Number of properties contributed to form joint venture 42spg_NumberOfPropertiesContributedToFormJointVenture
/ dei_LegalEntityAxis
= spg_HudsonBayCompanyMember
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= spg_HudsonBayCompanyJointVentureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		          
Joint venture ownership percentage 80.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= spg_HudsonBayCompanyMember
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= spg_HudsonBayCompanyJointVentureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		          
Sears Joint Venture            
Schedule of Equity Method Investments            
Contribution to form joint venture     114,000,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_SearsJointVentureMember		      
Joint venture ownership percentage     50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_SearsJointVentureMember		      
Sears Joint Venture | Minimum            
Schedule of Equity Method Investments            
Percentage of property space subject to recapture     50.00%spg_PercentageOfPropertySpaceSubjectToRecapture
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= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_SearsJointVentureMember		      
Sears Joint Venture | Sears            
Schedule of Equity Method Investments            
Number of properties contributed to form joint venture     10spg_NumberOfPropertiesContributedToFormJointVenture
/ dei_LegalEntityAxis
= spg_SearsHoldingsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_SearsJointVentureMember		      
Joint venture ownership percentage     50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= spg_SearsHoldingsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_SearsJointVentureMember		      
Klepierre | Corio            
Schedule of Equity Method Investments            
Ordinary share conversion ratio       1.14us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
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= spg_CorioMember
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McArthurGlen Group            
Schedule of Equity Method Investments            
Number of properties 5us-gaap_NumberOfRealEstateProperties
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Equity investment 581,400,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_McArthurGlenGroupMember		       677,100,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_McArthurGlenGroupMember		  
McArthurGlen Group | Minimum            
Schedule of Equity Method Investments            
Joint venture ownership percentage 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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= spg_McArthurGlenGroupMember		          
McArthurGlen Group | Maximum            
Schedule of Equity Method Investments            
Joint venture ownership percentage 90.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_McArthurGlenGroupMember		          
McArthurGlen Group | Roermond Designer Outlet            
Schedule of Equity Method Investments            
Joint venture ownership percentage         90.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
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= spg_RoermondDesignerOutletMember
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= spg_McArthurGlenGroupMember		  
Europe | Klepierre            
Schedule of Equity Method Investments            
Shares owned 57,634,148us-gaap_InvestmentOwnedBalanceShares
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Joint venture ownership percentage 18.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		     28.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
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= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		    
Quoted market price per share (in dollars per share) $ 49.48spg_EquityMethodInvestmentQuotedMarketValuePerShare
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= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		          
Share of net income, net of amortization of our excess investment 6,100,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 4,800,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		        
Total revenues 332,500,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
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= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 367,300,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		        
Total operating income 141,600,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 166,700,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
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Consolidated net income 72,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 52,900,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spg_KlepierreMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		        
Europe | McArthurGlen Group | Premium Outlets            
Schedule of Equity Method Investments            
Number of properties 5us-gaap_NumberOfRealEstateProperties
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= us-gaap_EuropeMember		          
Europe | McArthurGlen Group | Development project            
Schedule of Equity Method Investments            
Number of properties 1us-gaap_NumberOfRealEstateProperties
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/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
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/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		          
Mortgage Maturing 2017 | McArthurGlen Group | Roermond Designer Outlet            
Schedule of Equity Method Investments            
Debt refinanced         85,100,000us-gaap_RepaymentsOfDebt
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Interest rate on debt (as a percent)         5.12%us-gaap_DebtInstrumentInterestRateStatedPercentage
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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= spg_McArthurGlenGroupMember		  
Mortgage Maturing 2021 | McArthurGlen Group | Roermond Designer Outlet            
Schedule of Equity Method Investments            
Debt issued to refinance previous mortgage         218,900,000us-gaap_DebtInstrumentFaceAmount
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= spg_RoermondDesignerOutletMember
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= spg_McArthurGlenGroupMember		  
Interest rate on debt (as a percent)         1.86%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= spg_MortgageMaturing2021Member
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= spg_RoermondDesignerOutletMember
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= spg_McArthurGlenGroupMember		  
Mortgages | Houston Galleria            
Schedule of Equity Method Investments            
Debt refinanced           821,000,000us-gaap_RepaymentsOfDebt
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= spg_HoustonGalleriaMember
Interest rate on debt (as a percent)           5.44%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= us-gaap_MortgagesMember
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= spg_HoustonGalleriaMember
Mortgage Maturing 2025 | Houston Galleria            
Schedule of Equity Method Investments            
Debt issued to refinance previous mortgage           $ 1,200,000,000us-gaap_DebtInstrumentFaceAmount
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= spg_HoustonGalleriaMember
Interest rate on debt (as a percent)           3.55%us-gaap_DebtInstrumentInterestRateStatedPercentage
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