Debt - Narrative (Details) $ in Thousands			9 Months Ended
	Jan. 12, 2022 USD ($)	Jan. 11, 2022 USD ($)	Sep. 30, 2022 USD ($) item property	Dec. 31, 2021 USD ($)
Debt
Long-term debt			$ 24,640,370	$ 25,321,022
Simon Property Group, L.P.
Debt
Long-term debt			24,640,370	25,321,022
Secured Debt | Mortgages
Debt
Long-term debt			$ 5,300,000	$ 5,300,000
Debt covenants
Number of non-recourse mortgage notes under which the Company and subsidiaries are borrowers | item			38
Number of properties pledged as collateral | item			41
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			$ 19,300,000
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			1,200,000
Credit facility, weighted average amount outstanding			171,200
Letters of credit outstanding			10,000
Unsecured Debt | Credit Facility and Term Facility | Simon Property Group, L.P.
Debt
Maximum borrowing capacity			5,000,000
Additional borrowing capacity			$ 1,000,000
Unsecured Debt | Credit Facility | SOFR
Debt
Interest rate (as a percent)			1.00%
Unsecured Debt | Credit Facility | Simon Property Group, L.P.
Debt
Credit facility, amount outstanding			$ 125,000
Maximum borrowing capacity			$ 4,000,000
Additional extension period | item			2
Debt extension period			6 months
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. | SOFR
Debt
Interest rate (as a percent)			0.725%
Unsecured Debt | Credit Facility | Minimum | Simon Property Group, L.P.
Debt
Interest rate (as a percent)			0.00%
Facility fee (in percentage)			0.10%
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			95.00%
Interest rate (as a percent)			0.40%
Facility fee (in percentage)			0.30%
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
Credit facility, amount repaid	$ 1,050,000
Optional expanded maximum borrowing capacity			$ 4,500,000
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | SOFR
Debt
Interest rate (as a percent)			0.725%
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | USD | Fed Funds Effective Rate
Debt
Interest rate on debt (as a percent)			0.50%
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | USD | SOFR
Debt
Interest rate (as a percent)			1.00%
Unsecured Debt | Supplemental Facility | Minimum | Simon Property Group, L.P.
Debt
Interest rate (as a percent)			0.65%
Facility fee (in percentage)			0.10%
Unsecured Debt | Supplemental Facility | Minimum | Simon Property Group, L.P. | USD | Base Rate
Debt
Interest rate (as a percent)			0.00%
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P.
Debt
Interest rate (as a percent)			1.40%
Facility fee (in percentage)			0.30%
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P. | SOFR
Debt
Percentage of borrowings in currencies other than the U.S. dollar			100.00%
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P. | USD | Base Rate
Debt
Interest rate (as a percent)			0.40%