XML 84 R38.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Business (Details) | Mar. 31, 2015
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Noncontrolling Interest, Ownership Percentage by Parent | 96.20%us-gaap_MinorityInterestOwnershipPercentageByParent
Number of Real Estate Properties | 389 us-gaap_NumberOfRealEstateProperties
Number of States in which Entity Operates | 12 us-gaap_NumberOfStatesInWhichEntityOperates
Number of Units in Real Estate Property | 108,793 us-gaap_NumberOfUnitsInRealEstateProperty
Consolidated Properties [Member] |
Number of Real Estate Properties | 362 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = us-gaap_ConsolidatedPropertiesMember
Number of Units in Real Estate Property | 97,825 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstatePropertiesAxis = us-gaap_ConsolidatedPropertiesMember
Master-Leased Properties [Member] |
Number of Real Estate Properties | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = eqr_MasterLeasedPropertiesMember
Number of Units in Real Estate Property | 853 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstatePropertiesAxis = eqr_MasterLeasedPropertiesMember
Partially Owned Properties [Member] |
Number of Real Estate Properties | 19 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Number of Units in Real Estate Property | 3,771 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Unconsolidated Properties [Member] |
Number of Real Estate Properties | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = us-gaap_UnconsolidatedPropertiesMember
Number of Units in Real Estate Property | 1,281 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstatePropertiesAxis = us-gaap_UnconsolidatedPropertiesMember
Military Housing [Member] |
Number of Real Estate Properties | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = eqr_MilitaryHousingMember
Number of Units in Real Estate Property | 5,063 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstatePropertiesAxis = eqr_MilitaryHousingMember

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=eqr_MilitaryHousingMember
Namespace Prefix: |
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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: | us-gaap_RealEstatePropertiesAxis=us-gaap_UnconsolidatedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |