Amount of gain (loss) on conversion of debt instrument.

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This item represents the amount of the entity's share of net income loss reported by the joint ventures in which the entity has an ownership interest.

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Represents the quoted market price per share of an identified investment accounted for under the equity method of accounting for those investments in common stock for which a quoted market price is available.

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The number of real estate properties owned and consolidated by entity as of the balance sheet date.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Indicates name of component or group of components disposed of or classified as held-for-sale representing strategic shift that has or will have major effect on operation and financial result.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Investment in Unconsolidated Entities and International Investments - European Investments (Details) $ / shares in Units, $ in Thousands, € in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2026 USD ($) property $ / shares shares	Mar. 31, 2026 USD ($) shares	Mar. 31, 2026 EUR (€) shares	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) property $ / shares shares	Sep. 30, 2025 USD ($)	Dec. 31, 2025 property
Investment in Unconsolidated Entities
Total revenue	$ 1,814,556			$ 1,601,572	$ 5,362,247	$ 4,573,043
Operating income before other items	804,450			812,914	2,390,710	2,284,727
Consolidated net income (loss)	565,294			702,696	1,707,959	1,824,237
Gain (loss) due to disposal, exchange, or revaluation of equity interests, net	$ (8,259)			(8,871)	$ (26,588)	71,636
Klepierre \| Disposed by Sales
Investment in Unconsolidated Entities
Gain (loss) on disposition of assets/interests				$ 8,300		$ (1,300)
Discontinued Operation, Name [Extensible Enumeration]				spg:ShoppingCentersMember		spg:ShoppingCentersMember
European Joint Venture \| Designer Outlet properties
Investment in Unconsolidated Entities
Number of properties \| property	12				12		12
European Joint Venture \| Designer Outlet properties \| Minimum
Investment in Unconsolidated Entities
Ownership interest (as a percent)	23.00%				23.00%
European Joint Venture \| Designer Outlet properties \| Maximum
Investment in Unconsolidated Entities
Ownership interest (as a percent)	94.00%				94.00%
European Property Management and Development \| Designer Outlet properties
Investment in Unconsolidated Entities
Ownership interest (as a percent)	50.00%				50.00%
Europe \| Klepierre
Investment in Unconsolidated Entities
Total revenue	$ 401,741			$ 393,175	$ 1,209,293	$ 1,135,742
Operating income before other items	212,994			204,594	631,729	569,968
Consolidated net income (loss)	165,458			140,915	476,319	369,135
Our share of net income (loss)	30,469			30,877	83,994	71,789
Amortization of excess Investment	$ (3,484)			$ 1,883	$ (10,545)	$ (8,125)
Europe \| Designer Outlet properties
Investment in Unconsolidated Entities
Number of properties consolidated by entity \| property	8				8
Europe \| Klepierre
Investment in Unconsolidated Entities
Shares owned \| shares	59,280,541				59,280,541
Ownership interest (as a percent)	20.70%				20.70%
Quoted market price per share (in dollars per share) \| $ / shares	$ 40.24				$ 40.24
Europe \| Klepierre \| Exchangeable Debt
Investment in Unconsolidated Entities
Number of shares exchanged to settle the conversion \| shares		4,074,711	4,074,711
Amount of debt converted \| €			€ 110.3
Gain (loss) on acquisition of controlling interest		$ 64,300