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Real Estate and Accumulated Depreciation - Overall Summary and Encumbrances Reconciliation (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Real Estate and Accumulated Depreciation [Line Items]        
Number of Units in Real Estate Property       109,652
Overall summary of real estate and accumulated depreciation        
Accumulated Depreciation $ (5,432,805,000) $ (4,807,709,000) $ (4,912,221,000) $ (6,084,616,000)
Changes in total real estate        
Balance, beginning of year 27,675,383,000 26,800,948,000 21,008,429,000  
Acquisitions and development 964,645,000 1,121,423,000 9,273,492,000  
Improvements 186,104,000 191,243,000 139,950,000  
Dispositions and other (283,435,000) (438,231,000) (3,620,923,000)  
Balance, end of year 28,542,697,000 27,675,383,000 26,800,948,000  
Changes in accumulated depreciation        
Balance, beginning of year (5,432,805,000) (4,807,709,000) (4,912,221,000)  
Depreciation 765,895,000 758,861,000 1,013,353,000  
Dispositions and other (114,084,000) (133,765,000) (1,117,865,000)  
Balance, end of year (6,084,616,000) $ (5,432,805,000) $ (4,807,709,000)  
EQR-Fanwell 2007 LP [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 300,000,000
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract]        
Number of Properties Encumbered       4
EQR-Fanwell 2007 LP [Member] | Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 0
EQR-Fanwell 2007 LP [Member] | Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       300,000,000
EQR-Wellfan 2008 LP [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 550,000,000
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract]        
Number of Properties Encumbered       10
EQR-Wellfan 2008 LP [Member] | Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 0
EQR-Wellfan 2008 LP [Member] | Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       550,000,000
Fannie Mae Pool 3 [Domain]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 462,400,525
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract]        
Number of Properties Encumbered       5
Fannie Mae Pool 3 [Domain] | Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 24,223,525
Fannie Mae Pool 3 [Domain] | Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       438,177,000
Archstone Master Property [Domain]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 800,000,000
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract]        
Number of Properties Encumbered       13
Archstone Master Property [Domain] | Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 0
Archstone Master Property [Domain] | Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 800,000,000
Portfolio Entity Encumbrances [Member]        
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract]        
Number of Properties Encumbered       32
Individual Property Encumbrances [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 2,451,484,639
Individual Property Encumbrances [Member] | Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       319,205,053
Individual Property Encumbrances [Member] | Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       2,132,279,586
Real Estate Held For Sale-Individual Property Encumbrances [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       140,985,116
Real Estate Held For Sale-Individual Property Encumbrances [Member] | Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       0
Real Estate Held For Sale-Individual Property Encumbrances [Member] | Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 140,985,116
Investment in Real Estate - Wholly Owned Unencumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       211
Units       52,513
Investment in Real Estate, Gross       $ 17,437,812,582
Accumulated Depreciation (3,224,397,212)     (3,224,397,212)
Investment in Real Estate Net       14,213,415,370
Encumbrances       $ 0
Changes in accumulated depreciation        
Balance, end of year (3,224,397,212)      
Investment in Real Estate - Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       87
Units       23,686
Investment in Real Estate, Gross       $ 7,054,964,658
Accumulated Depreciation (1,464,311,726)     (1,464,311,726)
Investment in Real Estate Net       5,590,652,932
Encumbrances       $ 4,220,456,586
Changes in accumulated depreciation        
Balance, end of year (1,464,311,726)      
Investment in Real Estate - Wholly Owned Properties [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       298
Units       76,199
Investment in Real Estate, Gross       $ 24,492,777,240
Accumulated Depreciation (4,688,708,938)     (4,688,708,938)
Investment in Real Estate Net       19,804,068,302
Encumbrances       $ 4,220,456,586
Changes in accumulated depreciation        
Balance, end of year (4,688,708,938)      
Investment in Real Estate - Partially Owned Unencumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       9
Units       1,661
Investment in Real Estate, Gross       $ 262,146,372
Accumulated Depreciation (96,031,075)     (96,031,075)
Investment in Real Estate Net       166,115,297
Encumbrances       $ 0
Changes in accumulated depreciation        
Balance, end of year (96,031,075)      
Investment in Real Estate - Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       10
Units       2,110
Investment in Real Estate, Gross       $ 427,427,967
Accumulated Depreciation (120,665,999)     (120,665,999)
Investment in Real Estate Net       306,761,968
Encumbrances       $ 343,428,578
Changes in accumulated depreciation        
Balance, end of year (120,665,999)      
NONCONTROLLING INTERESTS – PARTIALLY OWNED PROPERTIES        
Overall summary of real estate and accumulated depreciation        
Properties       19
Units       3,771
Investment in Real Estate, Gross       $ 689,574,339
Accumulated Depreciation (216,697,074)     (216,697,074)
Investment in Real Estate Net       472,877,265
Encumbrances       $ 343,428,578
Changes in accumulated depreciation        
Balance, end of year (216,697,074)      
Total Consolidated Investment in Real Estate [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       317
Units       79,970
Investment in Real Estate, Gross       $ 25,182,351,579
Accumulated Depreciation (4,905,406,012)     (4,905,406,012)
Investment in Real Estate Net       20,276,945,567
Encumbrances       4,563,885,164
Changes in accumulated depreciation        
Balance, end of year (4,905,406,012)      
Total Consolidated Investment in Real Estate [Member] | Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       343,428,578
Total Consolidated Investment in Real Estate [Member] | Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 4,220,456,586
Real Estate Held For Sale - Wholly Owned Unencumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       68
Units       21,494
Investment in Real Estate, Gross       $ 3,118,799,507
Accumulated Depreciation (1,075,431,644)     (1,075,431,644)
Investment in Real Estate Net       2,043,367,863
Encumbrances       $ 0
Changes in accumulated depreciation        
Balance, end of year (1,075,431,644)      
Real Estate Held For Sale - Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       4
Units       1,768
Investment in Real Estate, Gross       $ 241,545,360
Accumulated Depreciation (103,778,656)     (103,778,656)
Investment in Real Estate Net       137,766,704
Encumbrances       $ 140,985,116
Changes in accumulated depreciation        
Balance, end of year (103,778,656)      
Total Real Estate Held For Sale [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       72
Units       23,262
Investment in Real Estate, Gross       $ 3,360,344,867
Accumulated Depreciation (1,179,210,300)     (1,179,210,300)
Investment in Real Estate Net       2,181,134,567
Encumbrances       $ 140,985,116
Changes in accumulated depreciation        
Balance, end of year (1,179,210,300)      
Unencumbered Properties [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       288
Units       75,668
Investment in Real Estate, Gross       $ 20,818,758,461
Accumulated Depreciation (4,395,859,931)     (4,395,859,931)
Investment in Real Estate Net       16,422,898,530
Encumbrances       $ 0
Changes in accumulated depreciation        
Balance, end of year (4,395,859,931)      
Encumbered Properties [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       101
Units       27,564
Investment in Real Estate, Gross       $ 7,723,937,985
Accumulated Depreciation (1,688,756,381)     (1,688,756,381)
Investment in Real Estate Net       6,035,181,604
Encumbrances       $ 4,704,870,280
Changes in accumulated depreciation        
Balance, end of year (1,688,756,381)      
Total Investment in Real Estate and Real Estate Held For Sale [Member]        
Overall summary of real estate and accumulated depreciation        
Properties       389
Units       103,232
Investment in Real Estate, Gross       $ 28,542,696,446
Accumulated Depreciation (6,084,616,312)     (6,084,616,312)
Investment in Real Estate Net       22,458,080,134
Encumbrances       4,704,870,280
Changes in accumulated depreciation        
Balance, end of year $ (6,084,616,312)      
Total Investment in Real Estate and Real Estate Held For Sale [Member] | Partially Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       343,428,578
Total Investment in Real Estate and Real Estate Held For Sale [Member] | Wholly Owned Encumbered [Member]        
Overall summary of real estate and accumulated depreciation        
Encumbrances       $ 4,361,441,702