Equity - Common Stock and Unit Issuances and Repurchases (Details) $ / shares in Units, $ in Millions				12 Months Ended
	Feb. 08, 2024 USD ($)	Sep. 07, 2023 shares	May 09, 2022 USD ($)	Dec. 31, 2023 USD ($) Vote item director $ / shares shares	Dec. 31, 2022 USD ($) person $ / shares shares	Dec. 31, 2021 shares
Equity
Minimum number of additional classes or series of common stock that the Board is authorized to reclassify from excess common stock | item				1
Exchange of limited partner units, (in shares)					2,680	58,571
Redemption of units				114,241	14,740	15,705
Common stock authorized for repurchase | $			$ 2,000.0
Period common stock is authorized to repurchase			2 years
Shares repurchased (in shares)				1,273,733	1,830,022
Average share price repurchased (in dollars per share) | $ / shares				$ 110.38	$ 98.57
Subsequent Event
Equity
Common stock authorized for repurchase | $	$ 2,000.0
Period common stock is authorized to repurchase	24 months
Simon Property Group, L.P.
Equity
Redemption of units				114,241	14,740	15,705
TRG
Equity
Ownership interest acquired (as a percent)		4.00%
TRG | Simon Property Group, L.P.
Equity
Number of units issued in connection with acquisition		1,725,000
Class B common stock
Equity
Common stock, shares outstanding				8,000	8,000
Number of voting trusts which are subject to outstanding shares common stock | Vote				2
Common Stock.
Equity
Number of votes entitled per share to holders of common stock | Vote				1
Limited Partners | Simon Property Group, L.P.
Equity
Exchange of limited partner units, (in shares)					2,680
Redemption of units				114,241	14,740
Number of limited partners whose common stock redeemed				11	3
Value of units redeemed | $				$ 13.5	$ 1.9
Number of limited partners who received common stock | person					2
Maximum | Class B common stock
Equity
Number of members of board of directors elected under entitlement of right | director				4