Investments in Unconsolidated Entities and International Investments - Unconsolidated Property Transactions (Details) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
	Sep. 07, 2023	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investment in Unconsolidated Entities
Payments for acquisitions									$ 27,712
Total revenue		$ 1,480,710				$ 1,410,948		$ 4,381,566	4,131,398
Operating (loss) income before other items		767,769				694,234		2,257,050	2,014,883
Consolidated net income (loss)		546,671				680,762		1,957,262	1,757,522
Gain (loss) on disposal, exchange, or revaluation of equity interests						158,192		414,769	194,629
TRG
Investment in Unconsolidated Entities
Total revenue		181,214				170,475		522,743	503,300
Operating (loss) income before other items		74,835				64,134		208,902	200,828
Consolidated net income (loss)		45,448				(79,515)		195,266	(8,840)
Our share of net income (loss)		37,829				(64,927)		163,408	(9,863)
Amortization of Excess Investment		(49,299)				28,883		(212,081)	(65,897)
Other Platform Investments
Investment in Unconsolidated Entities
Total revenue		2,657,141				3,265,353		8,075,212	9,414,604
Operating (loss) income before other items		(74,524)				257,104		(343,127)	342,353
Consolidated net income (loss)		(109,444)				136,745		(507,154)	8,379
Our share of net income (loss)		(20,315)				11,615		(118,137)	(18,122)
Amortization of Excess Investment		(692)				(1,665)		(2,076)	(4,994)
Simon Property Group, L.P.
Investment in Unconsolidated Entities
Payments for acquisitions									27,712
Total revenue		1,480,710				1,410,948		4,381,566	4,131,398
Operating (loss) income before other items		767,769				694,234		2,257,050	2,014,883
Consolidated net income (loss)		$ 546,671				680,762		1,957,262	1,757,522
Gain (loss) on disposal, exchange, or revaluation of equity interests						$ 158,192		$ 414,769	$ 194,629
Jamestown
Investment in Unconsolidated Entities
Ownership interest (as a percent)		50.00%						50.00%
TRG
Investment in Unconsolidated Entities
Ownership interest (as a percent)	84.00%	84.00%						84.00%
Payments for acquisitions	$ 199,600
Ownership interest acquired (as a percent)	4.00%
Aggregate investment in ventures		$ 2,870,048			$ 3,049,719			$ 2,870,048
TRG | Series A Cumulative Preferred Shares
Investment in Unconsolidated Entities
Preferred stock stated dividend rate (as a percent)	6.38%
Issuance of preferred units	$ 362,500
TRG | Simon Property Group, L.P.
Investment in Unconsolidated Entities
Number of units issued in connection with acquisition (in units)	1,725,000
Aggregate investment in ventures		$ 2,870,048			3,049,719			$ 2,870,048
JC Penney
Investment in Unconsolidated Entities
Ownership interest (as a percent)		41.67%						41.67%
SPARC Group
Investment in Unconsolidated Entities
Ownership interest (as a percent)		33.30%				33.30%		33.30%	33.30%
Loans to related party			$ 50,000	$ 100,000
Proceeds from reimbursement of loans funded			$ 50,000
Aggregate investment in ventures		$ 40,000			$ 169,200			$ 40,000
Guarantee provided		$ 50,000						$ 50,000
Gain (loss) on disposal, exchange, or revaluation of equity interests						$ 145,800
Deferred Taxes						$ 36,900			$ 36,900
Phoenix Retail, LLC
Investment in Unconsolidated Entities
Ownership interest (as a percent)			39.40%
Payments for acquisitions			$ 0
ABG
Investment in Unconsolidated Entities
Ownership interest (as a percent)					9.60%	11.70%			11.70%
Gain (loss) on disposal, exchange, or revaluation of equity interests					$ 10,300	$ 12,400	$ 36,400
Deferred Taxes					2,600	$ 3,100	$ 9,100		$ 3,100
Proceeds from sale or disposal of real estate assets				1,200,000	300,200
Pre-tax gain				414,800	157,100
Tax expense				$ 103,700	$ 39,300
RGG
Investment in Unconsolidated Entities
Ownership interest (as a percent)		45.00%						45.00%