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v3.20.1

Leases - Summary of Lease Income Types Relating to Lease Payments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Operating Leased Assets [Line Items] |  |
Total lease revenue | $ 662,032 | $ 640,697
Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 643,594 | 621,908
Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 18,438 | 18,789
Residential and Retail Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 630,574 | 610,990
Residential and Retail Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 612,480 | 592,520
Residential and Retail Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 18,094 | 18,470
Utility Recoveries (RUBS Income) [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 17,646 | 16,648
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 17,418 | 16,445
Utility Recoveries (RUBS Income) [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 228 | 203
Parking Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 9,930 | 9,209
Parking Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 9,833 | 9,137
Parking Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 97 | 72
Storage Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 981 | 963
Storage Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 962 | 919
Storage Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 19 | 44
Pet Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 2,901 | 2,887
Pet Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | $ 2,901 | $ 2,887

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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
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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
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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
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: |