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Leases - Summary of Lease Income Types Relating to Lease Payments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Operating Leased Assets [Line Items] |  |
Total lease revenue | $ 642,854 | $ 1,896,059
Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 624,281 | 1,841,133
Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 18,573 | 54,926
Residential and Retail Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 629,473 | 1,856,365
Residential and Retail Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 611,020 | 1,801,749
Residential and Retail Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 18,453 | 54,616
Parking Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 9,505 | 28,133
Parking Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 9,405 | 27,874
Parking Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 100 | 259
Storage Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 960 | 2,847
Storage Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 940 | 2,796
Storage Rent [Member] | Retail Lease [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 20 | 51
Pet Rent [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | 2,916 | 8,714
Pet Rent [Member] | Residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Total lease revenue | $ 2,916 | $ 8,714

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- Definition Operating lease lease income (loss). + References No definition available. + Details
Name: | eqr_OperatingLeaseLeaseIncomeLoss
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: |