Debt - Narrative (Details) € / shares in Units, $ in Thousands, € in Millions				3 Months Ended
	Nov. 17, 2023 USD ($)	Nov. 17, 2023 EUR (€)	Apr. 28, 2023 USD ($) property	Mar. 31, 2024 USD ($) item property	Feb. 01, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 14, 2023 USD ($)	Nov. 14, 2023 EUR (€) € / shares	Nov. 09, 2023 USD ($)	Jun. 01, 2023 USD ($)	Mar. 13, 2023 USD ($)	Mar. 08, 2023 USD ($)	Jan. 10, 2023 EUR (€)
Debt
Long-term debt				$ 25,519,340		$ 26,033,423
Simon Property Group, L.P.
Debt
Long-term debt				25,519,340		26,033,423
Senior unsecured 3.50 percent bonds exchangeable into ordinary shares | Simon Property Group, L.P.
Debt
Debt issued							$ 808,000	€ 750.0
Interest rate on debt (as a percent)							3.50%	3.50%
Ordinary shares of common price | € / shares								€ 27.2092
Secured Debt | Mortgages
Debt
Long-term debt				$ 5,300,000		$ 5,200,000
Debt covenants
Number of non-recourse mortgage notes under which the Company and subsidiaries are borrowers | item				36
Number of properties pledged as collateral | property				39
Number of cross-defaulted and cross-collateralized mortgage pools | item				2
Total number of properties pledged as collateral for cross defaulted and cross collateralized mortgages | property				5
Unsecured Debt | Senior unsecured notes | Simon Property Group, L.P.
Debt
Long-term debt				$ 20,100,000
Unsecured Debt | Senior Unsecured Notes 2.75% due 2023 | Simon Property Group, L.P.
Debt
Amount of debt redeemed										$ 600,000
Interest rate on debt (as a percent)										2.75%
Unsecured Debt | Senior Unsecured Notes Maturing March 2033 | Simon Property Group, L.P.
Debt
Debt issued												$ 650,000
Interest rate on debt (as a percent)												5.50%
Unsecured Debt | Senior Unsecured Notes Maturing March 2053 | Simon Property Group, L.P.
Debt
Debt issued												$ 650,000
Interest rate on debt (as a percent)												5.85%
Unsecured Debt | Senior Unsecured Notes Maturing January 2024 | Simon Property Group, L.P.
Debt
Amount of debt redeemed											$ 500,000
Unsecured Debt | Senior Unsecured Notes 6.65 Due January 15 2054 | Simon Property Group, L.P.
Debt
Debt issued									$ 500,000
Interest rate on debt (as a percent)									6.65%
Unsecured Debt | Senior Unsecured Notes 3.75 Due February 1 2024 | Simon Property Group, L.P.
Debt
Amount of debt redeemed					$ 600,000
Interest rate on debt (as a percent)					3.75%
Unsecured Debt | Senior Unsecured Notes 6.25 Due January 15 2034 | Simon Property Group, L.P.
Debt
Debt issued									$ 500,000
Interest rate on debt (as a percent)									6.25%
Unsecured Debt | Commercial Paper | Simon Property Group, L.P.
Debt
Long-term debt				0
Maximum borrowing capacity				2,000,000
Unsecured Debt | Credit Facilities | Simon Property Group, L.P.
Debt
Available borrowing capacity				8,100,000
Maximum amount outstanding during period				305,000
Credit facility, weighted average amount outstanding				305,000
Letters of credit outstanding				58,600
Unsecured Debt | Credit Facility | Simon Property Group, L.P.
Debt
Credit facility, amount outstanding				305,000
Maximum borrowing capacity				5,000,000
Additional borrowing capacity				1,000,000
Optional expanded maximum borrowing capacity				$ 6,000,000
Additional extension period | item				2
Debt extension period				6 months
Debt issued			$ 180,000
Number of properties unencumbered from debt borrowing | property			2
Unsecured Debt | Credit Facility | Simon Property Group, L.P. | Fed Funds Effective Rate
Debt
Interest rate (as a percent)				0.50%
Unsecured Debt | Credit Facility | Simon Property Group, L.P. | Adjusted Term One-Month SOFR
Debt
Interest rate (as a percent)				1.00%
Unsecured Debt | Credit Facility | Simon Property Group, L.P. | SOFR
Debt
Interest rate (as a percent)				0.725%
Unsecured Debt | Credit Facility | Minimum | Simon Property Group, L.P.
Debt
Facility fee (in percentage)				0.10%
Unsecured Debt | Credit Facility | Minimum | Simon Property Group, L.P. | Base Rate
Debt
Interest rate (as a percent)				0.00%
Unsecured Debt | Credit Facility | Minimum | Simon Property Group, L.P. | SOFR
Debt
Interest rate (as a percent)				0.65%
Unsecured Debt | Credit Facility | Maximum | Simon Property Group, L.P.
Debt
Percentage of borrowings in currencies other than the U.S. dollar				97.00%
Facility fee (in percentage)				0.30%
Unsecured Debt | Credit Facility | Maximum | Simon Property Group, L.P. | Base Rate
Debt
Interest rate (as a percent)				0.40%
Unsecured Debt | Credit Facility | Maximum | Simon Property Group, L.P. | SOFR
Debt
Interest rate (as a percent)				1.40%
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P.
Debt
Maximum borrowing capacity				$ 3,500,000
Optional expanded maximum borrowing capacity				$ 4,500,000
Credit facility, amount repaid	$ 815,400	€ 750.0
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | Interest rate swap
Debt
Notional Amount | €													€ 750.0
Fixed exchange rate													3.81%
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | Fed Funds Effective Rate
Debt
Interest rate (as a percent)				0.50%
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | Adjusted Term One-Month SOFR
Debt
Interest rate (as a percent)				1.00%
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | SOFR
Debt
Interest rate (as a percent)				0.725%
Unsecured Debt | Supplemental Facility | Minimum | Simon Property Group, L.P.
Debt
Facility fee (in percentage)				0.10%
Unsecured Debt | Supplemental Facility | Minimum | Simon Property Group, L.P. | Base Rate
Debt
Interest rate (as a percent)				0.00%
Unsecured Debt | Supplemental Facility | Minimum | Simon Property Group, L.P. | SOFR
Debt
Interest rate (as a percent)				0.65%
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P.
Debt
Percentage of borrowings in currencies other than the U.S. dollar				100.00%
Facility fee (in percentage)				0.30%
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P. | Base Rate
Debt
Interest rate (as a percent)				0.40%
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P. | SOFR
Debt
Interest rate (as a percent)				1.40%