Per Share and Per Unit Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic	$ 437,605	$ 548,475
Net Income attributable to Common Stockholders - Diluted	$ 437,605	$ 548,475
Weighted Average Shares Outstanding - Basic and Diluted	306,504,084	308,978,053
Simon Property Group, L.P.
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic	$ 504,263	$ 631,551
Net Income attributable to Common Stockholders - Diluted	$ 504,263	$ 631,551
Weighted Average Shares Outstanding - Basic and Diluted	353,191,960	355,778,250