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Leases - Summary of Lease Income Types Relating to Lease Payments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Operating Leased Assets [Line Items] |  |
Total lease revenue | $ 629,156 | $ 1,253,205
Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 611,389 | 1,216,852
Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 17,767 | 36,353
Residential and Retail Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 615,902 | 1,226,892
Residential and Retail Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 598,209 | 1,190,729
Residential and Retail Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 17,693 | 36,163
Parking Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 9,419 | 18,628
Parking Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 9,332 | 18,469
Parking Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 87 | 159
Storage Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 924 | 1,887
Storage Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 937 | 1,856
Storage Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | (13) | 31
Pet Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 2,911 | 5,798
Pet Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | $ 2,911 | $ 5,798

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- Definition Operating lease lease income (loss). + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | us-gaap_TypeOfArrangementAxis=eqr_ResidentialLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=eqr_RetailLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=eqr_ResidentialAndRetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ParkingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=eqr_StorageRentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=eqr_PetRentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |