Per Share and Per Unit Data (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic		$ 445,860	$ 437,605
Net Income attributable to Common Stockholders - Diluted		$ 445,860	$ 437,605
Weighted Average Shares Outstanding - Basic and Diluted		328,514,497	306,504,084
Dividends
Dividends declared per common share (in dollars per share)	$ 1.30
Dividend payable		$ 489,396		$ 486,922
Simon Property Group, L.P.
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic		510,085	$ 504,263
Net Income attributable to Common Stockholders - Diluted		$ 510,085	$ 504,263
Weighted Average Shares Outstanding - Basic and Diluted		375,836,653	353,191,960
Dividends
Distribution declared per unit (in dollars per share)	$ 1.30
Dividend payable		$ 489,396		$ 486,922