Summary of Significant Accounting Policies - Reclassification Out Of AOCI, Simon Property Group, L.P. (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Significant Accounting Policies
Total accumulated other comprehensive income (loss)	$ (250,900)		$ (250,900)		$ (221,600)
Interest expense	(221,338)	$ (218,086)	(451,960)	$ (417,515)
Simon Property Group, L.P.
Significant Accounting Policies
Total accumulated other comprehensive income (loss)	(288,500)		(288,500)		$ (254,900)
Interest expense	(221,338)	(218,086)	(451,960)	(417,515)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Simon Property Group, L.P. | Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
Interest expense	$ 1,268	$ 697	$ 2,879	$ 1,198