XML 108 R87.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 2,425,800 | $ 2,744,965 | $ 2,614,748
Operating income |  |  |  |  |  |  |  |  | 856,086 | 1,009,238 | 921,644
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 4,479,586 | 907,621 | 657,101
Discontinued operations, net |  |  |  |  |  |  |  |  | 518 | 397 | 1,582
Net income |  |  |  |  |  |  |  |  | 4,480,104 | 908,018 | 658,683
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 4,289,072 | $ 863,277 | $ 627,163
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 11.75 | $ 2.37 | $ 1.74
Weighted average Common Shares outstanding |  |  |  |  |  |  |  |  | 365,002 | 363,498 | 361,181
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 11.68 | $ 2.36 | $ 1.73
Weighted average Common Shares outstanding |  |  |  |  |  |  |  |  | 381,992 | 380,620 | 377,735
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 605,489 | $ 606,074 | $ 595,154 | $ 619,083 | $ 703,193 | $ 696,289 | $ 679,112 | $ 666,371 |  |  |
Operating income | 224,070 | 209,373 | 206,018 | 216,625 | 287,058 | 257,594 | 246,255 | 218,331 |  |  |
Income (loss) from continuing operations | 301,987 | 217,246 | 228,365 | 3,731,988 | 213,673 | 205,375 | 298,504 | 190,069 |  |  |
Discontinued operations, net | 394 | 246 | 35 | (157) | 47 | 81 | 114 | 155 |  |  |
Net income | 302,381 | 217,492 | 228,400 | 3,731,831 | 213,720 | 205,456 | 298,618 | 190,224 |  |  |
Net income available to Common Shares | $ 276,477 | $ 207,543 | $ 218,067 | $ 3,586,985 | $ 202,989 | $ 195,859 | $ 285,587 | $ 178,842 |  |  |
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares | $ 0.76 | $ 0.57 | $ 0.60 | $ 9.84 | $ 0.56 | $ 0.54 | $ 0.79 | $ 0.49 |  |  |
Weighted average Common Shares outstanding | 365,256 | 365,109 | 365,047 | 364,592 | 363,828 | 363,579 | 363,476 | 363,098 |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares | $ 0.75 | $ 0.56 | $ 0.59 | $ 9.76 | $ 0.55 | $ 0.53 | $ 0.78 | $ 0.49 |  |  |
Weighted average Common Shares outstanding | 381,860 | 382,373 | 382,065 | 382,243 | 381,220 | 380,663 | 380,491 | 380,327 |  |  |
ERPOP [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 2,425,800 | $ 2,744,965 | $ 2,614,748
Operating income |  |  |  |  |  |  |  |  | 856,086 | 1,009,238 | 921,644
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 4,479,586 | 907,621 | 657,101
Discontinued operations, net |  |  |  |  |  |  |  |  | 518 | 397 | 1,582
Net income |  |  |  |  |  |  |  |  | 4,480,104 | 908,018 | 658,683
Net income available to Units |  |  |  |  |  |  |  |  | $ 4,460,583 | $ 897,518 | $ 651,994
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 11.75 | $ 2.37 | $ 1.74
Weighted average Units outstanding |  |  |  |  |  |  |  |  | 378,829 | 377,074 | 374,899
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares |  |  |  |  |  |  |  |  | $ 11.68 | $ 2.36 | $ 1.73
Weighted average Common Shares outstanding |  |  |  |  |  |  |  |  | 381,992 | 380,620 | 377,735
ERPOP [Member] | Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 605,489 | $ 606,074 | $ 595,154 | $ 619,083 | $ 703,193 | $ 696,289 | $ 679,112 | $ 666,371 |  |  |
Operating income | 224,070 | 209,373 | 206,018 | 216,625 | 287,058 | 257,594 | 246,255 | 218,331 |  |  |
Income (loss) from continuing operations | 301,987 | 217,246 | 228,365 | 3,731,988 | 213,673 | 205,375 | 298,504 | 190,069 |  |  |
Discontinued operations, net | 394 | 246 | 35 | (157) | 47 | 81 | 114 | 155 |  |  |
Net income | 302,381 | 217,492 | 228,400 | 3,731,831 | 213,720 | 205,456 | 298,618 | 190,224 |  |  |
Net income available to Units | $ 287,546 | $ 215,896 | $ 226,847 | $ 3,730,294 | $ 211,039 | $ 203,637 | $ 296,941 | $ 185,901 |  |  |
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares | $ 0.76 | $ 0.57 | $ 0.60 | $ 9.84 | $ 0.56 | $ 0.54 | $ 0.79 | $ 0.49 |  |  |
Weighted average Units outstanding | 379,081 | 379,008 | 378,934 | 378,289 | 377,380 | 377,147 | 377,063 | 376,696 |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income available to Common Shares | $ 0.75 | $ 0.56 | $ 0.59 | $ 9.76 | $ 0.55 | $ 0.53 | $ 0.78 | $ 0.49 |  |  |
Weighted average Units outstanding | 381,860 | 382,373 | 382,065 | 382,243 | 381,220 | 380,663 | 380,491 | 380,327 |  |  |

X
- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period) and noncontrolling interests. + References No definition available. + Details
Name: | eqr_NetIncomeLossAvailableToCommonStockholderBasic
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unaudited Quarterly Financial Data. + References No definition available. + Details
Name: | eqr_UnauditedQuarterlyFinancialDataLineItems
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The average number of units issued and outstanding that are used in calculating diluted earnings per unit determined based on the timing of issuance of units in the period. + References No definition available. + Details
Name: | eqr_WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingDiluted
Namespace Prefix: | eqr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_EarningsPerShareBasic
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareBasicAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_EarningsPerShareDiluted
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareDilutedAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(12)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1012-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721523-107759 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 + Details
Name: | us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The consolidated profit or loss for the period including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 + Details
Name: | us-gaap_ProfitLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Weighted average number of limited partnership and general partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership and general partnership units have been outstanding to the total time in that period. Includes, for example, the number of units distributed to unit holders whereby unit holders have the ability to elect to receive the unit holders' entire distribution in cash or units of equivalent value or there is a potential limitation on the total amount of cash that all unit holders can elect to receive in aggregate. + References No definition available. + Details
Name: | us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
Name: | us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=eqr_ERPOPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |