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Real Estate and Lease Intangibles - Real Estate Starwood Disposition (Details) - Property | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Real Estate [Line Items] |  |
Properties disposed | 5 | 99
Disposed Units | 1,194 | 29,776
Starwood Portfolio [Member] |  |
Real Estate [Line Items] |  |
Properties disposed |  | 72
Disposed Units |  | 23,262
South Florida | Starwood Portfolio [Member] |  |
Real Estate [Line Items] |  |
Properties disposed |  | 33
Disposed Units |  | 10,742
Denver | Starwood Portfolio [Member] |  |
Real Estate [Line Items] |  |
Properties disposed |  | 18
Disposed Units |  | 6,635
Washington D.C. | Starwood Portfolio [Member] |  |
Real Estate [Line Items] |  |
Properties disposed |  | 10
Disposed Units |  | 3,020
Seattle | Starwood Portfolio [Member] |  |
Real Estate [Line Items] |  |
Properties disposed |  | 8
Disposed Units |  | 1,721
Los Angeles | Starwood Portfolio [Member] |  |
Real Estate [Line Items] |  |
Properties disposed |  | 3
Disposed Units |  | 1,144

X
- Definition The total number of rental properties that the Company disposed of to unaffiliated parties during the period. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of rental units associated with rental properties that the company disposed of to unaffiliated third parties during the period. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Period Type: |

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

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- Details
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Namespace Prefix: |
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Period Type: |

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