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The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement for cash outflows paid to third parties in connection with debt origination. Includes both continuing operations and discontinued operations.

No definition available.

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Balance Type:	debit
Period Type:	duration

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Net of tax effect of the reclassification adjustment for deferred gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges included in other liabilities that was charged against earnings during the period.

No definition available.

Name:	eqr_AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities
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Balance Type:	debit
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Name:	eqr_AmortizationOfDiscountsAndPremiumsOnDebtAbstract
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The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the mortgage notes payable during the period.

No definition available.

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The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the unsecured notes during the period.

No definition available.

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The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the line of credit and commercial paper during the period.

No definition available.

Name:	eqr_AmortizationofDiscountsandPremiumsonLineofCreditandCommercialPapernet
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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

No definition available.

Name:	eqr_Distributionsfromunconsolidatedentitiesinvestmentsinunconsolidatedentities
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This item represents disclosure of the amount of dividends or other distributions received from certain corporate joint ventures; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

No definition available.

Name:	eqr_Distributionsfromunconsolidatedentitiesotherliabilities
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Name:	eqr_DistributionsfromunconsolidatedentitiesreturnoncapitalAbstract
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The cash outflow from the distribution of an entity's earnings in the form of dividends to the limited partners in an operating partnership.

No definition available.

Name:	eqr_DistributionsLimitedPartners
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Balance Type:	credit
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The cash outflow from the return on capital for the noncontrolling partners in partially owned properties.

No definition available.

Name:	eqr_DistributionsMinorityInterestsPartiallyOwnedProperties
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The difference between the book value and the sale price of land parcels sold within the period.

No definition available.

Name:	eqr_GainLossOnSaleOfLandParcels
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Represents the charge against earnings for the indirect costs incurred from a material business comibnation such as severance and retention bonuses.

No definition available.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied and represents the indirect costs incurred from a material business combination such as severance and retention bonuses.

No definition available.

Name:	eqr_IncomeLossfromInvestmentsinUnconsolidatedEntitiesAdjustment
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with insurance, taxes or miscellaneous operating activities.

No definition available.

Name:	eqr_IncreaseDecreaseInMortgageDeposits
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Balance Type:	credit
Period Type:	duration

Name:	eqr_InterestCapitalizedForRealEstateAndUnconsolidatedEntitiesUnderDevelopmentAbstract
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The amount of interest that was capitalized to construction in progress for properties under development during the period.

No definition available.

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Data Type:	xbrli:monetaryItemType
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The amount of interest that was capitalized to construction in progress for unconsolidated entities under development during the period.

No definition available.

Name:	eqr_InterestCapitalizedForUnconsolidatedEntitiesUnderDevelopment
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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The value of unconsolidated entities real estate assumed by the Company during the reporting period.

No definition available.

Name:	eqr_Investmentsinunconsolidatedentities
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	eqr_InvestmentsinunconsolidatedentitiesAbstract
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Data Type:	xbrli:stringItemType
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The value of other liabilities assumed by the Company for investments in unconsolidated entities during the reporting period.

No definition available.

Name:	eqr_Investmentsinunconsolidatedentitiesotherliabilities
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	eqr_LossFromInvestmentsInUnconsolidatedEntitiesAbstract
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Period Type:	duration

The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with debt obligations.

No definition available.

Name:	eqr_MortgageDepositsFinancingActivities
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

No definition available.

Name:	eqr_MortgageDepositsInvestingActivities
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The cash out flow from the lump sum payment of collateralized debt obligations (backed by pledge, mortgage or other lien in the entity's assets).

No definition available.

Name:	eqr_MortgageNotesPayableLumpSumPayoffs
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Balance Type:	credit
Period Type:	duration

Name:	eqr_OtherAbstract
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Represents the accrual of indirect costs incurred from a material business comibnation such as severance and retention bonuses.

No definition available.

Name:	eqr_OtherLiabilitiesLossFromInvestmentsInUnconsolidatedEntitiesMerger
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The cash outflow to reacquire OP Units during the period.

No definition available.

Name:	eqr_PaymentsForRepurchaseOfOpUnits
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The cash outflow from the distribution of an entity's earnings in the form of dividends to the general partner.

No definition available.

Name:	eqr_PaymentsOfDividendsGeneralPartner
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The cash outflow for the return on capital for preference units.

No definition available.

Name:	eqr_PaymentsOfDividendsPreferenceUnits
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The cash outflow for acquisition of or capital improvements of property, plant and equipment not otherwise defined in the taxonomy.

No definition available.

Name:	eqr_PaymentsToAcquireOtherCapitalAssets
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Data Type:	xbrli:monetaryItemType
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The cash inflow from distributions of capital received from unconsolidated joint ventures ( i.e proportionate share of proceeds and/or gain/loss from property sales).

No definition available.

Name:	eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries
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Data Type:	xbrli:monetaryItemType
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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity.

No definition available.

Name:	eqr_ProceedsFromUnsecuredLineOfCredit
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Data Type:	xbrli:monetaryItemType
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The cash outflow to repay long-term debt that is wholly or partially secured by collateral.

No definition available.

Name:	eqr_RepaymentsOfMortgageNotesPayable
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	eqr_UnrealizedGainLossOnDerivativeInstrumentsAbstract
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in unsecured notes for the period.

No definition available.

Name:	eqr_UnrealizedGainLossOnDerivativeInstrumentsNotesNet
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The increases (decreases) in the market value of derivative instruments designated and qualifying as cash flow hedging instruments that was recognized in other assets during the current period.

No definition available.

Name:	eqr_UnrealizedGainLossOnDerivativeInstrumentsOtherAssets
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The increases (decreases) in the market value of derivative instruments designated and qualifying as cash flow hedging instruments that was recognized in other liabilities during the current period.

No definition available.

Name:	eqr_UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities
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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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The amount of expense charged against earnings by an Entity to record deferred gains and losses on hedge instruments. Examples include gain on economic hedges, amortization of gain on designated fair value hedge and so forth.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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-Glossary Cash Equivalents

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

Name:	us-gaap_EquityMethodInvestmentDividendsOrDistributions
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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as operating activities. This may include cash restricted for regulatory purposes.

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The increase (decrease) during the reporting period in security deposits.

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Amount of interest capitalized during the period.

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-Glossary Allowance for Funds Used during Construction

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

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Net cash outflow or inflow from the amount given in advance to show intention to complete the acquisition piece of land, anything permanently fixed to it, including buildings, structures on it, and so forth.

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The net cash outflow or inflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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The cash outflow for loan and debt issuance costs.

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Payments to develop real estate assets is the process of adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements; and are generally classified as cash flow from investing activities.

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The cash inflow from borrowing by issuing commercial paper.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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The cash inflow from the capital received in cash from a partner in a partnership during the period.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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The cash outflow due to repaying amounts borrowed by issuing commercial paper.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.

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