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Debt Lines of Credit (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Maturity Date | Sep. 01, 2014 |  |  |  |
Long-term Line of Credit | $ 115,000,000 us-gaap_LineOfCredit | $ 333,000,000 us-gaap_LineOfCredit |  |  |
A 175 billion LOC [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unsecured revolving credit facility |  |  | 1,750,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = eqr_A175BillionLocMember |  |
Remaining borrowing capacity | 2,350,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = eqr_A175BillionLocMember |  |  |  |
Amount restricted/dedicated to support letters of credit | 34,900,000 us-gaap_LineOfCreditFacilityIncreaseDecreaseOtherNet / us-gaap_LineOfCreditFacilityAxis = eqr_A175BillionLocMember |  |  |  |
Weighted average interest rate on revolving letter of credit | 1.26%eqr_WeightedAverageInterestRateRevolvingCreditFacility / us-gaap_LineOfCreditFacilityAxis = eqr_A175BillionLocMember |  |  |  |
A 250 billion LOC [Member] [Domain] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unsecured revolving credit facility | 2,500,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = eqr_A250BillionLocMemberDomain |  |  |  |
500.0 million ability to increase |  | 500,000,000 eqr_AbilityToIncreaseLineOfCredit / us-gaap_LineOfCreditFacilityAxis = eqr_A250BillionLocMemberDomain |  |  |
Line Of Credit Facility Commitment Fee | 15 Basis Points |  |  |  |
Line of Credit Maturity | Apr. 01, 2018 |  |  |  |
Remaining borrowing capacity |  | 2,120,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = eqr_A250BillionLocMemberDomain |  |  |
Amount restricted/dedicated to support letters of credit |  | 43,800,000 us-gaap_LineOfCreditFacilityIncreaseDecreaseOtherNet / us-gaap_LineOfCreditFacilityAxis = eqr_A250BillionLocMemberDomain |  |  |
Weighted average interest rate on revolving letter of credit |  | 0.95%eqr_WeightedAverageInterestRateRevolvingCreditFacility / us-gaap_LineOfCreditFacilityAxis = eqr_A250BillionLocMemberDomain |  |  |
$1.25 billion LOC [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unsecured revolving credit facility |  |  | 1,750,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = eqr_A125BillionLocMember | 1,250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = eqr_A125BillionLocMember |
500.0 million ability to increase |  |  |  | 500,000,000 eqr_AbilityToIncreaseLineOfCredit / us-gaap_LineOfCreditFacilityAxis = eqr_A125BillionLocMember |
Line of Credit Maturity |  |  |  | Jul. 13, 2014 |
Increase to Line of Credit |  |  | 500,000,000 eqr_IncreaseToLineOfCredit / us-gaap_LineOfCreditFacilityAxis = eqr_A125BillionLocMember |  |
Line of Credit Facility, Commitment Fee Percentage |  |  | 0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = eqr_A125BillionLocMember |  |
$1.425 Billion LOC [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  | 1,425,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = eqr_A1425BillionLocMember
Line of Credit Maturity |  |  |  |  | Feb. 01, 2012
Write Off Of Unamortized Deferred Financing Costs |  |  |  | $ 200,000 eqr_WriteOffOfUnamortizedDeferredFinancingCosts / us-gaap_LineOfCreditFacilityAxis = eqr_A1425BillionLocMember |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus 1.75% |  |  |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | A 250 billion LOC [Member] [Domain] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus 1.05% |  |  |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | $1.25 billion LOC [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR plus 1.15% |  |

X
- Definition Represents the amount by which available borrowings on the unsecured revolving credit facility may be increased. The available borrowings may be increased by adding additional banks to the facility or obtaining the agreement of existing banks to increase their commitments. + References No definition available. + Details
Name: | eqr_AbilityToIncreaseLineOfCredit
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount by which available borrowings on the unsecured revolving credit facility was increased. The available borrowings may be increased by adding additional banks to the facility or obtaining the agreement of existing banks to increase their commitments. + References No definition available. + Details
Name: | eqr_IncreaseToLineOfCredit
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | eqr_LineOfCreditFacilityCommitmentFee
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the line of credit is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, quarter, etc.). + References No definition available. + Details
Name: | eqr_LineOfCreditMaturity
Namespace Prefix: | eqr_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average interest rate on the revolving line of credit during the period. + References No definition available. + Details
Name: | eqr_WeightedAverageInterestRateRevolvingCreditFacility
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents charges to interest expense related to the extinguishment of borrowing before maturity. + References No definition available. + Details
Name: | eqr_WriteOffOfUnamortizedDeferredFinancingCosts
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net increase or decrease in the carrying amount of the credit facility for the period for reasons other than accrued, but unpaid interest, additional borrowings, repayments, and forgiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

X
- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=eqr_A1425BillionLocMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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