Investments in Unconsolidated Entities and International Investments - Combined Balance Sheets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
ASSETS:
Investment properties, at cost	$ 37,903,758	$ 37,932,366
Less - accumulated depreciation	15,804,885	15,621,127
Investment properties, at cost, net	22,098,873	22,311,239
Cash and cash equivalents	514,929	533,936
Tenant receivables and accrued revenue, net	819,829	919,654
Right-of-use assets, net	501,910	504,119
Deferred costs and other assets	1,130,747	1,121,011
Total assets	33,451,427	33,777,379
Liabilities and Partners' Deficit:
Mortgages	25,169,837	25,321,022
Accounts payable, accrued expenses, intangibles, and deferred revenues	1,208,643	1,433,216
Lease liabilities	504,684	506,931
Other liabilities	525,849	540,912
Total liabilities	29,160,555	29,376,654
Preferred units	558,305	547,740
Total liabilities and partners' deficit	33,451,427	33,777,379
Unconsolidated properties | Equity Method Investees excluding Klepierre and TRG and other platform investments
Our Share of:
Partners' deficit	(1,260,901)	(1,207,396)
Add: Excess Investment	1,267,144	1,283,645
Our net Investment in unconsolidated entities, at equity	6,243	76,249
Unconsolidated properties | Equity Method Investees excluding Klepierre and TRG and other platform investments
ASSETS:
Investment properties, at cost	19,533,151	19,724,242
Less - accumulated depreciation	8,255,410	8,330,891
Investment properties, at cost, net	11,277,741	11,393,351
Cash and cash equivalents	1,392,710	1,481,287
Tenant receivables and accrued revenue, net	517,657	591,369
Right-of-use assets, net	161,471	154,561
Deferred costs and other assets	369,541	394,691
Total assets	13,719,120	14,015,259
Liabilities and Partners' Deficit:
Mortgages	15,075,434	15,223,710
Accounts payable, accrued expenses, intangibles, and deferred revenues	823,553	995,392
Lease liabilities	149,194	158,372
Other liabilities	414,084	383,018
Total liabilities	16,462,265	16,760,492
Preferred units	67,450	67,450
Partners' deficit	(2,810,595)	(2,812,683)
Total liabilities and partners' deficit	$ 13,719,120	$ 14,015,259
Unconsolidated properties | Maximum
Our Share of:
Estimated life of investment property	40 years