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CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP - USD ($)
$ in Thousands
Total
ERPOP [Member]
Preferred Stock [Member]
ERPOP [Member]
GENERAL PARTNER [Member]
ERPOP [Member]
LIMITED PARTNERS [Member]
ERPOP [Member]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]
ERPOP [Member]
DISTRIBUTIONS [Member]
ERPOP [Member]
PARTIALLY OWNED PROPERTIES [Member]
ERPOP [Member]
Balance, beginning of year at Dec. 31, 2021     $ 37,280 $ 10,951,940 $ 214,094 $ (34,272)    
Balance, beginning of year at Dec. 31, 2021               $ 18,166
Conversion of OP Units held by Limited Partners into OP Units held by General Partner       11,923 (11,923)      
Issuance of OP Units       139,623        
Exercise of EQR share options       25,069        
EQR's Employee Share Purchase Plan (ESPP)       4,178        
EQR restricted shares       11,595 1      
EQR share options       2,321        
EQR ESPP discount       796        
Net income available to Units - General Partner   $ 773,821   773,821        
OP Units - General Partner distributions       (942,047)        
Offering costs       (783)        
Supplemental Executive Retirement Plan (SERP)       (269)        
Acquisition of Noncontrolling Interest - Partially Owned Properties       (27,383)        
Change in market value of Redeemable Limited Partners       176,490        
Unrealized holding gains (losses) arising during the year $ 20,654 20,654       20,654    
Losses reclassified into earnings from other comprehensive income 11,071 11,071       11,071    
Equity compensation associated with Units - Limited Partners         19,104      
Net income available to Units - Limited Partners   26,310     26,310      
Units - Limited Partners distributions         (30,407)      
Change in carrying value of Redeemable Limited Partners         4,214      
Adjustment for Limited Partners ownership in Operating Partnership       11,432 (11,432)      
Distributions declared per Unit outstanding             $ 2.50  
Net income attributable to Noncontrolling Interests 806,995 806,995           3,774
Contributions by Noncontrolling Interests               603
Distributions to Noncontrolling Interests               (18,469)
Acquisitions of Noncontrolling Interests - Partially Owned Properties               (4,795)
Balance, end of year at Dec. 31, 2022     37,280 11,138,706 209,961 (2,547)    
Balance, end of year at Dec. 31, 2022               (721)
Conversion of OP Units held by Limited Partners into OP Units held by General Partner       23,948 (23,948)      
Exercise of EQR share options       23,632        
EQR's Employee Share Purchase Plan (ESPP)       3,517        
EQR restricted shares       12,486 1      
EQR share options       4,628        
EQR ESPP discount       644        
OP Units repurchased and retired (49,100)     49,105        
Net income available to Units - General Partner   832,348   832,348        
OP Units - General Partner distributions       (1,004,904)        
Supplemental Executive Retirement Plan (SERP)       32,078        
Acquisition of Noncontrolling Interest - Partially Owned Properties       (900)        
Change in market value of Redeemable Limited Partners       7,667        
Unrealized holding gains (losses) arising during the year 4,514 4,514       4,514    
Losses reclassified into earnings from other comprehensive income 3,737 3,737       3,737    
Equity compensation associated with Units - Limited Partners         16,430      
Net income available to Units - Limited Partners   26,710     26,710      
Units - Limited Partners distributions         (30,107)      
Change in carrying value of Redeemable Limited Partners         21,358      
Adjustment for Limited Partners ownership in Operating Partnership       18,099 (18,099)      
Distributions declared per Unit outstanding             2.65  
Net income attributable to Noncontrolling Interests 868,488 868,488           6,340
Contributions by Noncontrolling Interests               9
Distributions to Noncontrolling Interests               (5,818)
Acquisitions of Noncontrolling Interests - Partially Owned Properties               (2,837)
Consolidation of previously unconsolidated entities               4,021
Balance, end of year at Dec. 31, 2023     37,280 11,042,844 202,306 5,704    
Balance, end of year at Dec. 31, 2023               994
Partial redemption     (20,125)          
Conversion of OP Units held by Limited Partners into OP Units held by General Partner       8,770 (8,770)      
Exercise of EQR share options       23,000        
EQR's Employee Share Purchase Plan (ESPP)       3,522        
EQR restricted shares       13,907 2      
EQR share options       3,441        
EQR ESPP discount       711        
OP Units repurchased and retired (38,500)     38,474        
Net income available to Units - General Partner   1,032,774   1,032,774        
OP Units - General Partner distributions       (1,023,922)        
Supplemental Executive Retirement Plan (SERP)       (594)        
Acquisition of Noncontrolling Interest - Partially Owned Properties       1,120        
Change in market value of Redeemable Limited Partners       (49,366)        
Unrealized holding gains (losses) arising during the year (3,989) (3,989)       (3,989)    
Losses reclassified into earnings from other comprehensive income 2,499 2,499       2,499    
Equity compensation associated with Units - Limited Partners         15,462      
Net income available to Units - Limited Partners   28,932     28,932      
Units - Limited Partners distributions         (30,583)      
Change in carrying value of Redeemable Limited Partners         51      
Adjustment for Limited Partners ownership in Operating Partnership       5,458 (5,458)      
Distributions declared per Unit outstanding             $ 2.70  
Net income attributable to Noncontrolling Interests $ 1,070,975 $ 1,070,975           6,212
Contributions by Noncontrolling Interests               583
Distributions to Noncontrolling Interests               (3,258)
Acquisitions of Noncontrolling Interests - Partially Owned Properties               (4,249)
Other               (1,000)
Balance, end of year at Dec. 31, 2024     $ 17,155 $ 11,023,191 $ 201,942 $ 4,214    
Balance, end of year at Dec. 31, 2024               $ (718)