Per Share and Per Unit Data (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Oct. 23, 2020	Sep. 29, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic			$ 145,926	$ 544,254	$ 837,744	$ 1,588,053
Net Income attributable to Common Stockholders - Diluted			$ 145,926	$ 544,254	$ 837,744	$ 1,588,053
Weighted Average Shares Outstanding - Basic and Diluted			305,913,431	307,275,230	306,099,266	308,314,456
Dividends
Dividends declared per common share (in dollars per share)	$ 1.30	$ 1.30
Dividend/Distribution payable			$ 458,144		$ 458,144
Simon Property Group, L.P.
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic			168,086	$ 627,074	965,210	$ 1,829,014
Net Income attributable to Common Stockholders - Diluted			$ 168,086	$ 627,074	$ 965,210	$ 1,829,014
Weighted Average Shares Outstanding - Basic and Diluted			352,420,845	354,038,110	352,673,474	355,096,211
Dividends
Distribution declared per unit (in dollars per share)		$ 1.30
Dividend/Distribution payable			$ 458,144		$ 458,144