Significant Accounting Policies - Reclassification Out Of AOCI, Simon Property Group, L.P. (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Significant Accounting Policies
Total accumulated other comprehensive income (loss)	$ (229,000)		$ (229,000)		$ (199,500)
Interest expense	(218,086)	$ (187,316)	(417,515)	$ (372,473)
Simon Property Group, L.P.
Significant Accounting Policies
Total accumulated other comprehensive income (loss)	(262,000)		(262,000)		$ (228,300)
Interest expense	(218,086)	(187,316)	(417,515)	(372,473)
Accumulated derivative gains (losses), net | Simon Property Group, L.P. | Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
Interest expense	$ 697	$ 401	$ 1,198	$ 789