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Transactions With Related Parties (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |
Indirect Ownership Interest Percentage | 1.00%eqr_IndirectOwnershipInterestPercentage |  |
Amount Incurred For leased office space | $ 2.5 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty | $ 1.7 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty | $ 1.3 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty

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- Definition The parent entity's indirect ownership interest in various entities contained within a wholly owned qualified REIT subsidiary that was setup for tax purposes. + References No definition available. + Details
Name: | eqr_IndirectOwnershipInterestPercentage
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration