Summary of Significant Accounting Policies - Reclassification Out Of AOCI, Simon Property Group, L.P. (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Significant Accounting Policies
Total accumulated other comprehensive income (loss)	$ (243,800)		$ (243,800)		$ (221,600)
Interest expense	(226,424)	$ (212,210)	(678,382)	$ (629,725)
Simon Property Group, L.P.
Significant Accounting Policies
Total accumulated other comprehensive income (loss)	(280,500)		(280,500)		$ (254,900)
Interest expense	(226,424)	(212,210)	(678,382)	(629,725)
Accumulated derivative gains (losses), net | Simon Property Group, L.P. | Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
Interest expense	$ 1,289	$ 671	$ 4,168	$ 1,869