Debt - Narrative (Details) $ in Thousands, € in Millions									6 Months Ended
	Apr. 28, 2023 USD ($) property	Mar. 14, 2023 USD ($)	Nov. 17, 2022 USD ($)	Nov. 17, 2022 EUR (€)	Nov. 16, 2022 USD ($)	Nov. 16, 2022 EUR (€)	Jan. 12, 2022 USD ($)	Jan. 11, 2022 USD ($)	Jun. 30, 2023 USD ($) item property	Jun. 01, 2023 USD ($)	Mar. 13, 2023 USD ($)	Mar. 08, 2023 USD ($)	Jan. 10, 2023 EUR (€)	Dec. 31, 2022 USD ($)
Debt
Long-term debt									$ 24,990,480					$ 24,960,286
Simon Property Group, L.P.
Debt
Long-term debt									24,990,480					24,960,286
Secured Debt | Mortgages
Debt
Long-term debt									$ 5,100,000					$ 5,500,000
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									$ 18,900,000
Amount of debt redeemed											$ 500,000
Debt repaid			$ 777,100	€ 750.0
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 February 2032 | Simon Property Group, L.P.
Debt
Debt issued								$ 700,000
Interest rate on debt (as a percent)								2.65%
Unsecured Debt | Senior Unsecured Notes Maturing January 2024 | Simon Property Group, L.P. | SOFR
Debt
Interest rate (as a percent)								0.43%
Debt issued								$ 500,000
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									7,400,000
Maximum amount outstanding during period									1,100,000
Credit facility, weighted average amount outstanding									1,000,000
Letters of credit outstanding									10,000
Unsecured Debt | Credit Facility and Term Facility | Simon Property Group, L.P.
Debt
Maximum borrowing capacity		$ 6,000,000
Additional borrowing capacity		1,000,000
Unsecured Debt | Credit Facility | Simon Property Group, L.P.
Debt
Credit facility, amount outstanding									305,000
Maximum borrowing capacity		$ 5,000,000							$ 5,000,000		$ 4,000,000
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
Amount drawn					$ 779,000	€ 750.0
Credit facility, amount outstanding									$ 816,400
Maximum borrowing capacity									3,500,000
Credit facility, amount repaid							$ 1,050,000
Optional expanded maximum borrowing capacity									$ 4,500,000
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%