CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive income:
Net income	$ 277,846	$ 223,846	$ 708,402	$ 562,804
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period		12,026	(33,765)	24,021
Losses reclassified into earnings from other comprehensive income	5,757	4,595	14,659	13,902
Other comprehensive income (loss)	5,757	16,621	(19,106)	37,923
Comprehensive income	283,603	240,467	689,296	600,727
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(10,946)	(9,519)	(27,096)	(23,848)
Comprehensive income attributable to controlling interests	272,657	230,948	662,200	576,879
ERPOP [Member]
Comprehensive income:
Net income	277,846	223,846	708,402	562,804
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period		12,026	(33,765)	24,021
Losses reclassified into earnings from other comprehensive income	5,757	4,595	14,659	13,902
Other comprehensive income (loss)	5,757	16,621	(19,106)	37,923
Comprehensive income	283,603	240,467	689,296	600,727
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(830)	(750)	(2,450)	(1,939)
Comprehensive income attributable to controlling interests	$ 282,773	$ 239,717	$ 686,846	$ 598,788