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Leases - Summary of Lease Income Types Relating to Lease Payments (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Operating Leased Assets [Line Items] |
Total lease revenue | $ 2,608,103
Residential Leases [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 2,534,779
Retail Lease [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 73,324
Residential and Retail Rent [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 2,486,189
Residential and Retail Rent [Member] | Residential Leases [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 2,414,201
Residential and Retail Rent [Member] | Retail Lease [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 71,988
Utility Recoveries (RUBS Income) [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 68,576
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 67,659
Utility Recoveries (RUBS Income) [Member] | Retail Lease [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 917
Parking Rent [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 37,905
Parking Rent [Member] | Residential Leases [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 37,557
Parking Rent [Member] | Retail Lease [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 348
Storage Rent [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 3,816
Storage Rent [Member] | Residential Leases [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 3,745
Storage Rent [Member] | Retail Lease [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 71
Pet Rent [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | 11,617
Pet Rent [Member] | Residential Leases [Member] |
Operating Leased Assets [Line Items] |
Total lease revenue | $ 11,617

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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=eqr_UtilityRecoveriesMember
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: |