Significant Accounting Policies - Reclassification Out Of AOCI, Simon Property Group, L.P. (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Significant Accounting Policies
Total accumulated other comprehensive income (loss)	$ (195,300)		$ (195,300)		$ (175,100)
(Loss) gain on acquisition of controlling interest, sale or disposal of, or recovery on, assets and interests in unconsolidated entities and impairment, net	(17,875)		(16,384)	$ 93,057
Interest expense	(187,316)	$ (200,419)	(372,473)	(402,435)
Simon Property Group, L.P.
Significant Accounting Policies
Total accumulated other comprehensive income (loss)	(223,600)		(223,600)		$ (200,200)
(Loss) gain on acquisition of controlling interest, sale or disposal of, or recovery on, assets and interests in unconsolidated entities and impairment, net	(17,875)		(16,384)	93,057
Interest expense	(187,316)	(200,419)	(372,473)	(402,435)
Currency translation adjustments. | Simon Property Group, L.P. | Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
(Loss) gain on acquisition of controlling interest, sale or disposal of, or recovery on, assets and interests in unconsolidated entities and impairment, net				5,660
Accumulated derivative gains (losses), net | Simon Property Group, L.P. | Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
Interest expense	$ 401	$ 475	$ 789	$ 958