Per Share and Per Unit Data (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 29, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic		$ 254,213	$ 495,324	$ 691,818	$ 1,043,799
Net Income attributable to Common Stockholders - Diluted		$ 254,213	$ 495,324	$ 691,818	$ 1,043,799
Weighted Average Shares Outstanding - Basic and Diluted		305,882,326	308,708,798	306,193,205	308,842,682
Dividends
Dividends declared per common share (in dollars per share)	$ 1.30
Dividend payable		$ 458,150		$ 458,150
Simon Property Group, L.P.
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic		292,863	$ 570,389	797,125	$ 1,201,940
Net Income attributable to Common Stockholders - Diluted		$ 292,863	$ 570,389	$ 797,125	$ 1,201,940
Weighted Average Shares Outstanding - Basic and Diluted		352,410,392	355,491,396	352,801,176	355,634,031
Dividends
Distribution declared per unit (in dollars per share)	$ 1.30
Dividend payable		$ 458,150		$ 458,150