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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) (USD $) In Thousands, unless otherwise specified | Total | Additional Paid-in Capital [Member] | PREFERRED SHARES | COMMON SHARES, $0.01 PAR VALUE | RETAINED EARNINGS | Accumulated Other Comprehensive (Loss) | OPERATING PARTNERSHIP | Partially Owned Properties [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, Noncontrolling Interest at Dec. 31, 2014 | $ 339,320 us-gaap_MinorityInterest |  |  |  |  |  | $ 214,411 us-gaap_MinorityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | $ 124,909 us-gaap_MinorityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember
Beginning Balance, Parent at Dec. 31, 2014 | 10,368,456 us-gaap_StockholdersEquity | 8,536,340 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 50,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 3,629 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,950,639 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (172,152)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Preferred Shares [Abstract] |  |  |  |  |  |  |  |
Partial redemption of 8.29% Series K Cumulative Redeemable | (9,820)us-gaap_TreasuryStockValueAcquiredParValueMethod |  | (9,820)us-gaap_TreasuryStockValueAcquiredParValueMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |
Common Share Issuance: |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  | 3,712 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 1 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (3,713)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |
Exercise of share options |  | 32,205 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 8 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  | 1,927 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
Restricted Shares |  | 6,720 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 2 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Share options |  | 997 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
ESPP discount |  | 412 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  | (2,307)eqr_SupplementalExecutiveRetirementPlanSerp / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership | 41,763 us-gaap_MinorityInterestChangeInRedemptionValue | (41,763)us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  | 872 us-gaap_MinorityInterestPeriodIncreaseDecrease / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | (872)us-gaap_MinorityInterestPeriodIncreaseDecrease / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |
Net income attributable to controlling interests | 182,522 us-gaap_NetIncomeLoss |  |  |  | 182,522 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Common Share distributions |  |  |  |  | (201,032)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Preferred Share distributions |  |  |  |  | (891)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Premium on redemption of Preferred Shares | (2,789)us-gaap_RedemptionPremium |  |  |  | (2,789)us-gaap_RedemptionPremium / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Other comprehensive (loss) income – derivative instruments: |  |  |  |  |  |  |  |
Unrealized holding (losses) arising during the period | (11,788)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  | (11,788)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Losses reclassified into earnings from other comprehensive income | (4,338)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  |  |  | 4,338 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Currency translation adjustments arising during the period | (420)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  |  | (420)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  | 1 eqr_ContributionValueLongTermIncentivePlanUnit / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |
Equity Compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 9,963 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |
Net (income) attributable to Noncontrolling Interests - Operating Partnership | (7,059)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |  | 7,059 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (7,913)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | (2,891)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember
Change in carrying value | (630)us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease |  |  |  |  |  | 630 us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties | 643 eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties |  |  |  |  |  |  | 643 eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember
Ending Balance, Noncontrolling Interest at Mar. 31, 2015 | 342,227 us-gaap_MinorityInterest |  |  |  |  |  | 219,566 us-gaap_MinorityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | 122,661 us-gaap_MinorityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember
Ending Balance, Parent at Mar. 31, 2015 | $ 10,331,362 us-gaap_StockholdersEquity | $ 8,539,115 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 40,180 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 3,640 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,928,449 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (180,022)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |

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