Document and Entity Information Document Information [Table] Legal Entity [Axis] All Entities [Member] Represents information pertaining to Simon Property Group, L.P., a limited partnership and Simon Property Group Inc.'s majority-owned Operating Partnership subsidiary. Simon Property Group, L.P. Simon Property Group, L.P Class of Stock [Axis] Class of Stock [Domain] Common Class A [Member] Common stock Common Class B [Member] Class B common stock Represents the information about series J redeemable preferred stock. Series J Redeemable Preferred Stock [Member] Series J Redeemable Preferred Stock Document Information [Line Items] Document Information Document Type Document Quarterly Report Document Period End Date Document Transition Report Entity Registrant Name Entity Incorporation, State or Country Code Securities Act File Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Entity Listing, Par Value Per Share Consolidated Balance Sheets Statement [Table] Outstanding nonredeemable series J preferred stock or outstanding series J preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Series J Preferred stock Series J cumulative redeemable preferred stock Investment, Name [Axis] Investment, Name [Domain] Unconsolidated Investments excluding Klepierre and Taubman Realty Group. Unconsolidated Investments excluding Klepierre and TRG Other unconsolidated entities Represents activity related to Klepierre. Klepierre Klepierre Statement Statement Assets [Abstract] ASSETS: Real Estate Investment Property, at Cost Investment properties, at cost Investment properties, at cost Real Estate Investment Property, Accumulated Depreciation Less - accumulated depreciation Real Estate Investment Property, Net Investment properties, at cost, net Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Accounts and Financing Receivable, after Allowance for Credit Loss Tenant receivables and accrued revenue, net Equity Method Investments Investment, at equity Our net Investment in unconsolidated entities, at equity Operating Lease, Right-of-Use Asset Right-of-use assets, net Deferred Costs and Other Assets Deferred costs and other assets Assets Total assets Liabilities [Abstract] LIABILITIES: Long-Term Debt Mortgages Mortgages and unsecured indebtedness Long-term debt The summation of accounts payable, accrued expenses, intangibles, and deferred revenues. Accounts Payable, Accrued Expenses, Intangibles, and Deferred Revenues Accounts payable, accrued expenses, intangibles, and deferred revenues Accounts payable, accrued expenses, intangibles, and deferred revenues Cash Distributions and Losses in Partnerships and Joint Ventures, at Equity. Cash Distributions and Losses in Partnerships and Joint Ventures, at Equity Cash distributions and losses in unconsolidated entities, at equity Dividends Payable Dividend payable Operating Lease, Liability Operating lease liabilities Lease liabilities Other Liabilities Other liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Preferred units Limited partners' preferred interest in the Operating Partnership and noncontrolling redeemable interests Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] EQUITY: Equity, Attributable to Parent [Abstract] Simon Property Group, Inc.'s Stockholders' Equity or Simon Property Group, L.P. Partners' Equity All types, classes, and series of stock. Capital stock Capital stock (850,000,000 total shares authorized, $0.0001 par value, 238,000,000 shares of excess common stock, 100,000,000 authorized shares of preferred stock): Preferred Stock, Value, Issued Series J 83/8% cumulative redeemable preferred stock, 1,000,000 shares authorized, 796,948 issued and outstanding with a liquidation value of $39,847 Common Stock, Value, Outstanding Common stock, $0.0001 par value, 511,990,000 shares authorized, 343,060,687 and 343,060,687 issued and outstanding, respectively Additional Paid in Capital Capital in excess of par value Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Treasury Stock, Common, Value Common stock held in treasury, at cost, 18,778,775 and 17,844,817 shares, respectively Equity, Attributable to Parent Total stockholders' equity Partners' Capital [Abstract] Partners' Equity Preferred Units, Preferred Partners' Capital Accounts Preferred units, 796,948 units outstanding. Liquidation value of $39,847 General Partners' Capital Account General Partner, 324,289,912 and 325,223,870 units outstanding, respectively Limited Partners' Capital Account Limited Partners, 56,063,958 and 55,689,714 units outstanding, respectively Partners' Capital Partners' deficit Total partners' equity Equity, Attributable to Noncontrolling Interest Noncontrolling interests Total noncontrolling interests reflected in equity Partners' Capital Attributable to Noncontrolling Interest Nonredeemable noncontrolling interests in properties, net Equity, Including Portion Attributable to Noncontrolling Interest Balance Balance Total equity Partners' Capital, Including Portion Attributable to Noncontrolling Interest Balance Balance Total equity Liabilities and Equity Total liabilities and equity The number of shares of capital stock authorized. Capital Stock, Shares Authorized Capital stock, total shares authorized Face amount or stated value of all types and classes of stock per share. Capital Stock, Par Value Per Share Capital stock, par value (in dollars per share) The number of shares of capital stock authorized less the number of shares of capital stock issued. Capital Stock, Shares of Excess Common Stock Capital stock, shares of excess common stock The number of shares of preferred stock authorized as part of the total number of shares of capital stock. Capital Stock, Authorized Shares of Preferred Stock Capital stock, authorized shares of preferred stock Preferred Stock, Dividend Rate, Percentage Preferred stock stated dividend rate (as a percent) Preferred Stock, Shares Authorized Series J 8 3/8% cumulative redeemable preferred stock, shares authorized Preferred Stock, Shares Issued Series J 8 3/8% cumulative redeemable preferred stock, shares issued Preferred Stock, Shares Outstanding Series J 8 3/8% cumulative redeemable preferred stock, shares outstanding Preferred Units, Outstanding Preferred units, units outstanding Preferred Stock, Liquidation Preference, Value Preferred units, Liquidation value (in dollars) Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Treasury Stock, Common, Shares Common stock held in treasury, shares General Partners' Capital Account, Units Outstanding General Partner, units outstanding Limited Partners' Capital Account, Units Outstanding Limited Partners, units outstanding Consolidated Statements of Operations and Comprehensive Income Revenues [Abstract] REVENUE: Operating Lease, Lease Income Lease income Lease Income Revenue, comprised of base and incentive revenue, from operating and managing another entity's business during the reporting period; plus revenues not otherwise specified. Management Fees and Other Revenues Management fees and other revenues Management fees and other revenues Other Income Other income Other Income Revenues Total revenue Total revenue Costs and Expenses [Abstract] EXPENSES: OPERATING EXPENSES: Direct Costs of Leased and Rented Property or Equipment Property operating Property Operating Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Depreciation and amortization Real Estate Tax Expense Real estate taxes Real estate taxes Cost of Property Repairs and Maintenance Repairs and maintenance Repairs and maintenance Marketing and Advertising Expense Advertising and promotion Advertising and promotion Home and Regional Office Costs. Home and Regional Office Costs Home and regional office costs Home and regional office costs General and Administrative Expense General and administrative General and administrative Other Cost and Expense, Operating Other Costs and Expenses Total operating expenses Operating Income (Loss) Operating income (loss) before other items OPERATING INCOME BEFORE OTHER ITEMS Operating income before other items Interest Expense, Nonoperating Interest expense Amount of gain (loss) on disposal, exchange or revaluation of equity interests. Gain (Loss) on Disposal Exchange Or Evaluation of Equity Interests Loss due to disposal, exchange, or revaluation of equity interests, net Loss due to disposal, exchange, or revaluation of equity interests, net Gain (loss) due to disposal, exchange, or revaluation of equity interests, net Amount of current income tax expense (benefit) and deferred income tax expense (benefit) and other taxes pertaining to continuing operations. Income Tax Expense (Benefit) And Other Income and other tax benefit Income (Loss) from Equity Method Investments Equity in income of unconsolidated entities (Loss) income from unconsolidated entities Income from Unconsolidated Entities Amount of unrealized gain (loss) on investment in equity security measured at fair value and derivative instruments, net. Unrealized Gains Losses In F V Equity Instruments And Derivative Instruments Unrealized losses (gains) in fair value of publicly traded equity instruments and derivative instrument, net Unrealized gains (losses) in fair value of publicly traded equity instruments and derivative instrument, net In a business combination achieved in stages, this element represents the amount of gain or loss recognized by the entity as a result of re-measuring to fair value the equity interest in the acquiree it held before the business combination. Also includes the difference between the carrying value and the sales price for consolidated investment property and equity method investments and impairment, net. Acquisition Of Controlling Interest Sale Or Disposal Of Or Recovery On Assets And Interests In Unconsolidated Entities Gain Or Loss And Impairment Net Gain on acquisition of controlling interests, sale or disposal of, or recovery on, assets and interests in unconsolidated entities and impairment, net Gain on acquisition of controlling interest, sale or disposal of, or recovery on, assets and interests in unconsolidated entities and impairment, net Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Consolidated Net Income CONSOLIDATED NET INCOME Consolidated net income (loss) Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to noncontrolling interests Net income attributable to noncontrolling interests Preferred Stock Dividends and Other Adjustments Preferred dividends Net Income (Loss) Available to Common Stockholders, Basic Net Income attributable to Common Stockholders - Basic NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS Partnership Income [Abstract] NET INCOME ATTRIBUTABLE TO UNITHOLDERS ATTRIBUTABLE TO: Net Income (Loss) Allocated to General Partners General Partner Net Income (Loss) Allocated to Limited Partners Limited Partners Earnings Per Share, Basic [Abstract] BASIC AND DILUTED EARNINGS PER COMMON SHARE: Earnings Per Share, Basic Net income attributable to common stockholders - basic (in dollars per share) Earnings Per Share, Diluted Net income attributable to common stockholders - diluted (in dollars per share) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Unrealized gain (loss) on derivative hedge agreements Unrealized gain (loss) on hedging activities Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Net gain reclassified from accumulated other comprehensive loss into earnings Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Currency translation adjustments Gross appreciation or the gross loss in value of the total unsold securities at the end of an accounting period, after tax, plus other increases (decreases) in other comprehensive income not otherwise identified. Changes in Available for Sale Securities and Other Changes in available-for-sale securities and other Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to common stockholders Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile consolidated net income to net cash provided by operating activities The cash flow add back for the noncash expense of depreciation and amortization. Depreciation and Amortization, Cash Flows Depreciation and amortization Straight Line Rent Straight-line lease income Proceeds from Equity Method Investment, Distribution Distributions of income from unconsolidated entities Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities Increase (Decrease) in Accounts and Notes Receivable Tenant receivables and accrued revenue, net Increase (Decrease) in Prepaid Expense and Other Assets Deferred costs and other assets The net change during the reporting period in accounts payable, accrued expenses, intangibles, deferred revenues and other liabilities. Increase (Decrease) in Accounts Payable, Accrued Expenses, Intangibles, Deferred Revenues, and Other Liabilities Accounts payable, accrued expenses, intangibles, deferred revenues and other Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Payments to Acquire Real Estate and Real Estate Joint Ventures Acquisitions Repayment of Notes Receivable from Related Parties Repayments of loans to related parties Payments to Acquire Productive Assets Capital expenditures, net Cash inflow and outflow from acquisitions and from consolidation and deconsolidation of properties. Cash from Acquisitions and Cash Impact of Property Consolidation and Deconsolidation Cash impact from the consolidation of properties Payments to Acquire Interest in Subsidiaries and Affiliates Investments in unconsolidated entities Payments to Acquire Investments Purchase of equity instruments Proceeds from Sale, Maturity and Collection of Investments Proceeds from sale of equity instruments Proceeds from Equity Method Investment, Distribution, Return of Capital Distributions of capital from unconsolidated entities and other Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: The cash outflow from the issuance of common stock, units, and other types of equity, net of transaction costs. Proceeds From Issuance Or Sale Of Common Stock Or Units And Other Net Of Issuance Costs Proceeds from sales of common stock and other, net of transaction costs Payment, Tax Withholding, Share-Based Payment Arrangement Purchase of shares related to stock grant recipients' tax withholdings This element represents the redemption of limited partner's unit during the reporting period. Redemption of Limited Partner Units Redemption of limited partner units Payments for Repurchase of Common Stock Purchase of treasury stock The cash outflow to acquire general partner units. Payments For Purchase Of General Partner Units Purchase of general partner units Payments to Noncontrolling Interests Distributions to noncontrolling interest holders in properties Proceeds from Noncontrolling Interests Contributions from noncontrolling interest holders in properties Distributions from earnings to preferred unit holders. Distributions to Preferred Unit Holders, Financing Activities Preferred distributions of the Operating Partnership Amount of cash outflow in the form of ordinary dividends to common and preferred shareholders of the parent entity. Payments of Ordinary Dividends, Common Stock and Preferred Stock Preferred dividends and distributions to stockholders Payments of Ordinary Dividends, Noncontrolling Interest Distributions to limited partners Proceeds from Debt, Net of Issuance Costs Proceeds from issuance of debt, net of transaction costs Repayments of Long-Term Debt Repayments of debt Amount of debt redeemed Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect DECREASE IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents CASH AND CASH EQUIVALENTS, end of period CASH AND CASH EQUIVALENTS, beginning of period Consolidated Statements of Equity Partner Type [Axis] Partner Type of Partners' Capital Account, Name [Domain] General Partner [Member] General Partner Limited Partner [Member] Limited Partner Equity Components [Axis] Equity Component [Domain] Preferred Stock [Member] Preferred Stock Common Stock [Member] Common Stock AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) Additional Paid-in Capital [Member] Capital in Excess of Par Value Retained Earnings [Member] Accumulated Deficit Treasury Stock, Common [Member] Common Stock Held in Treasury Noncontrolling Interest [Member] Noncontrolling Interests