Debt - Narrative (Details) € / shares in Units, $ in Thousands, € in Millions					9 Months Ended
	Sep. 19, 2024 USD ($)	Nov. 17, 2023 USD ($)	Nov. 17, 2023 EUR (€)	Apr. 28, 2023 USD ($) property	Sep. 30, 2024 USD ($) property item	Oct. 01, 2024 USD ($)	Sep. 26, 2024 USD ($)	Sep. 13, 2024 USD ($)	Feb. 01, 2024 USD ($)	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					$ 25,417,558					$ 26,033,423
Simon Property Group, L.P.
Debt
Long-term debt					25,417,558					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					$ 5,100,000					$ 5,200,000
Debt covenants
Number of non-recourse mortgage notes under which the Company and subsidiaries are borrowers | item					35
Number of properties pledged as collateral | property					38
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 | Senior Unsecured Notes 2.00 Due September 13 2024 | Simon Property Group, L.P.
Debt
Amount of debt redeemed								$ 1,000,000
Interest rate on debt (as a percent)								2.00%
Unsecured Debt | Senior Unsecured Notes 4.75 Due September 26 2034 | Simon Property Group, L.P.
Debt
Debt issued							$ 1,000,000
Interest rate on debt (as a percent)							4.75%
Unsecured Debt | Senior Unsecured Notes 3.38 Due October 1 2024 | Simon Property Group, L.P. | Subsequent Event
Debt
Amount of debt redeemed						$ 900,000
Interest rate on debt (as a percent)						3.38%
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					325,100
Credit facility, weighted average amount outstanding					306,300
Letters of credit outstanding					58,600
Unsecured Debt | Credit Facility | Simon Property Group, L.P.
Debt
Credit facility, amount outstanding					325,100
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. | Secured Overnight Financing Rate (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. | Secured Overnight Financing Rate (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. | Secured Overnight Financing Rate (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. | Secured Overnight Financing Rate (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. | Secured Overnight Financing Rate (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. | Secured Overnight Financing Rate (SOFR)
Debt
Interest rate (as a percent)					1.40%