Per Share and Per Unit Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic	$ 544,254	$ 556,267	$ 1,588,053	$ 1,723,925
Net Income attributable to Common Stockholders - Diluted	$ 544,254	$ 556,267	$ 1,588,053	$ 1,723,925
Weighted Average Shares Outstanding - Basic and Diluted	307,275,230	309,294,045	308,314,456	309,739,557
Simon Property Group, L.P.
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic	$ 627,074	$ 640,402	$ 1,829,014	$ 1,984,527
Net Income attributable to Common Stockholders - Diluted	$ 627,074	$ 640,402	$ 1,829,014	$ 1,984,527
Weighted Average Shares Outstanding - Basic and Diluted	354,038,110	356,073,080	355,096,211	356,562,262