Per Share and Per Unit Data (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Feb. 07, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic		$ 503,241	$ 679,936	$ 617,257	$ 445,860	$ 271,483	$ 145,926	$ 254,213	$ 437,605	$ 2,246,294	$ 1,109,227	$ 2,098,247
Net Income attributable to Common Stockholders - Diluted										$ 2,246,294	$ 1,109,227	$ 2,098,247
Weighted Average Shares Outstanding - Basic		328,619,248	328,619,163	328,594,136	328,514,497	316,595,345	305,913,431	305,882,326	306,504,084	328,587,137	308,737,625	307,950,112
Weighted Average Shares Outstanding - Diluted		328,619,248	328,619,163	328,594,136	328,514,497	316,595,345	305,913,431	305,882,326	306,504,084	328,587,137	308,737,625	307,950,112
Dividends
Total dividends/distributions paid per common share/unit										$ 5.85	$ 6.00	$ 8.30
Percent taxable as ordinary income										93.10%	97.40%	100.00%
Percent taxable as long-term capital gains										6.90%	2.60%	0.00%
Total percentage of dividends paid										100.00%	100.00%	100.00%
Subsequent Event
Dividends
Dividends declared per common share (in dollars per share)	$ 1.65
Simon Property Group, L.P.
Per Share And Per Unit Data
Net Income attributable to Common Stockholders - Basic		$ 575,596	$ 777,740	$ 706,087	$ 510,085	$ 311,238	$ 168,086	$ 292,863	$ 504,263	$ 2,569,508	$ 1,276,450	$ 2,416,945
Net Income attributable to Common Stockholders - Diluted										$ 2,569,508	$ 1,276,450	$ 2,416,945
Weighted Average Shares Outstanding - Basic		375,872,212	375,882,318	375,875,290	375,836,653	363,050,401	352,420,845	352,410,392	353,191,960	375,866,759	355,281,882	354,724,019
Weighted Average Shares Outstanding - Diluted		375,872,212	375,882,318	375,875,290	375,836,653	363,050,401	352,420,845	352,410,392	353,191,960	375,866,759	355,281,882	354,724,019
Simon Property Group, L.P. | Subsequent Event
Dividends
Distribution declared per unit (in dollars per share)	$ 1.65