$EQR
EQUITY RESIDENTIAL Stock $eqr

$eqr Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000156459022005566 Filed on February 17, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$645.1M	$2.464B	$613.4M
YoY Change	5.17%	-4.19%	-10.26%
Cost Of Revenue	$235.4M	$948.8M	$223.5M
YoY Change	5.32%	3.53%	-1.41%
Gross Profit	$409.7M	$1.515B	$389.9M
YoY Change	5.09%	-8.46%	-14.65%
Gross Profit Margin	63.51%	61.49%	63.56%
Selling, General & Admin	$13.40M	$56.51M	$11.10M
YoY Change	20.76%	16.99%	-4.31%
% of Gross Profit	3.27%	3.73%	2.85%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$222.2M	$838.3M	$201.8M
YoY Change	10.13%	2.12%	-6.1%
% of Gross Profit	54.24%	55.32%	51.76%
Operating Expenses	$235.6M	$894.8M	$212.9M
YoY Change	10.68%	2.95%	-6.0%
Operating Profit	$174.1M	$1.676B	$177.0M
YoY Change	-1.64%	27.15%	-23.14%
Interest Expense	-$71.93M	-$255.5M	-$117.5M
YoY Change	-38.78%	-30.58%	14.86%
% of Operating Profit	-41.32%	-15.25%	-66.38%
Other Income/Expense, Net	-$8.367M	-$19.28M	-$9.200M
YoY Change	-9.05%	10.14%	31.43%
Pretax Income	$561.6M	$1.401B	$264.2M
YoY Change	112.56%	50.26%	-11.7%
Income Tax	$236.0K	$915.0K	$400.0K
% Of Pretax Income	0.04%	0.07%	0.15%
Net Earnings	$527.0M	$1.333B	$252.9M
YoY Change	108.37%	45.88%	-12.73%
Net Earnings / Revenue	81.68%	54.09%	41.23%
Basic Earnings Per Share		$3.56
Diluted Earnings Per Share	$1.353M	$3.54	$680.0K
COMMON SHARES
Basic Shares Outstanding		373.8M
Diluted Shares Outstanding		388.1M

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$123.8M	$123.8M	$43.00M
YoY Change	187.98%	187.98%	-6.52%
Cash & Equivalents	$123.8M	$123.8M	$42.59M
Short-Term Investments	$0.00
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$123.8M	$123.8M	$43.00M
YoY Change	187.98%	187.98%	-6.52%
LONG-TERM ASSETS
Property, Plant & Equipment	$20.39B	$20.39B	$19.84B
YoY Change	2.77%	2.77%	-4.46%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$127.4M	$127.4M	$52.78M
YoY Change	141.46%	140.47%	1.04%
Other Assets	$236.4M	$236.4M	$57.00M
YoY Change	314.74%	314.74%	-19.72%
Total Long-Term Assets	$21.05B	$21.05B	$20.24B
YoY Change	3.96%	3.96%	-4.18%
TOTAL ASSETS
Total Short-Term Assets	$123.8M	$123.8M	$43.00M
Total Long-Term Assets	$21.05B	$21.05B	$20.24B
Total Assets	$21.17B	$21.17B	$20.29B
YoY Change	4.35%	4.35%	-4.18%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$107.0M	$107.0M	$107.0M
YoY Change	0.01%	0.01%	13.83%
Accrued Expenses	$381.8M	$139.0M	$372.0M
YoY Change	2.65%	-62.64%	-0.8%
Deferred Revenue
YoY Change
Short-Term Debt	$315.0M	$315.0M	$415.0M
YoY Change	-24.09%	-24.09%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.104B	$860.7M	$1.187B
YoY Change	-7.03%	-27.49%	56.8%
LONG-TERM LIABILITIES
Long-Term Debt	$8.026B	$8.269B	$7.653B
YoY Change	4.88%	8.05%	-15.53%
Other Long-Term Liabilities	$353.1M	$353.1M	$345.0M
YoY Change	2.35%	2.35%	-0.58%
Total Long-Term Liabilities	$8.380B	$8.622B	$7.998B
YoY Change	4.77%	7.81%	-14.98%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.104B	$860.7M	$1.187B
Total Long-Term Liabilities	$8.380B	$8.622B	$7.998B
Total Liabilities	$9.483B	$10.21B	$9.184B
YoY Change	3.25%	4.64%	-9.64%
SHAREHOLDERS EQUITY
Retained Earnings	$1.827B		$1.400B
YoY Change	30.53%		0.95%
Common Stock	$3.755M		$3.723M
YoY Change	0.86%		0.16%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$10.95B	$10.95B	$10.53B
YoY Change
Total Liabilities & Shareholders Equity	$21.17B	$21.17B	$20.29B
YoY Change	4.35%	4.35%	-4.18%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$527.0M	$1.333B	$252.9M
YoY Change	108.37%	45.88%	-12.73%
Depreciation, Depletion And Amortization	$222.2M	$838.3M	$201.8M
YoY Change	10.13%	2.12%	-6.1%
Cash From Operating Activities	$282.0M	$1.260B	$231.2M
YoY Change	21.96%	-0.42%	-36.27%
INVESTING ACTIVITIES
Capital Expenditures	-$767.2M	-$2.071B	-$117.2M
YoY Change	554.59%	375.83%	-75.73%
Acquisitions
YoY Change
Other Investing Activities	$642.2M	$1.637B	$364.4M
YoY Change	76.22%	48.94%	-1.33%
Cash From Investing Activities	-$125.0M	-$434.6M	$247.1M
YoY Change	-150.6%	-165.5%	-317.52%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net		$7.465M
YoY Change		-3.79%
Cash From Financing Activities	-23.45M	-565.1M	-613.8M
YoY Change	-96.18%	-70.97%	183.12%
NET CHANGE
Cash From Operating Activities	282.0M	1.260B	231.2M
Cash From Investing Activities	-125.0M	-434.6M	247.1M
Cash From Financing Activities	-23.45M	-565.1M	-613.8M
Net Change In Cash	133.5M	260.5M	-135.5M
YoY Change	-198.51%	-1608.36%	-518.21%
FREE CASH FLOW
Cash From Operating Activities	$282.0M	$1.260B	$231.2M
Capital Expenditures	-$767.2M	-$2.071B	-$117.2M
Free Cash Flow	$1.049B	$3.331B	$348.4M
YoY Change	201.14%	95.87%	-58.81%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-13647000
CY2021	eqr	Historical Volatility Estimation Period HistoricalVolatilityEstimationPeriod	P5Y
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsMember
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsMember
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsMember
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsMember
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsMember
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsMember
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsMember
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsMember
CY2021Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesMember
CY2020Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesMember
CY2021	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P5Y4M13D
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P4Y9M3D
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P8Y8M15D
CY2021Q4	eqr	Employee Share Purchase Plan Issuance Price Minimum EmployeeSharePurchasePlanIssuancePriceMinimum	53.13
CY2020Q4	eqr	Employee Share Purchase Plan Issuance Price Minimum EmployeeSharePurchasePlanIssuancePriceMinimum	46.23
CY2021	eqr	Gain Loss On Sales Of Land Parcels GainLossOnSalesOfLandParcels	5000
CY2021Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	8354282000
CY2021Q4	eqr	Employee Share Purchase Plan Issuance Price Maximum EmployeeSharePurchasePlanIssuancePriceMaximum	71.04
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019Q4	eqr	Employee Share Purchase Plan Issuance Price Minimum EmployeeSharePurchasePlanIssuancePriceMinimum	59.56
CY2021	dei	Auditor Firm AuditorFirmId	42
CY2021	dei	Auditor Name AuditorName	Ernst and Young LLP
CY2021	dei	Auditor Location AuditorLocation	Chicago, Illinois, USA
CY2021Q4	us-gaap	Number Of Units In Real Estate Property NumberOfUnitsInRealEstateProperty	80407
CY2021Q4	us-gaap	Land Land	5814790000
CY2020Q4	us-gaap	Land Land	5785367000
CY2021Q4	eqr	Depreciable Property DepreciableProperty	22370811000
CY2020Q4	eqr	Depreciable Property DepreciableProperty	20920654000
CY2021Q4	us-gaap	Development In Process DevelopmentInProcess	24307000
CY2020Q4	us-gaap	Development In Process DevelopmentInProcess	411134000
CY2021Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	62998000
CY2020Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	86170000
CY2021Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	28272906000
CY2020Q4	eqr	Employee Share Purchase Plan Issuance Price Maximum EmployeeSharePurchasePlanIssuancePriceMaximum	63.84
CY2020Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	27203325000
CY2020Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	7859657000
CY2019Q4	eqr	Employee Share Purchase Plan Issuance Price Maximum EmployeeSharePurchasePlanIssuancePriceMaximum	72.91
CY2021Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	19918624000
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	19343668000
CY2021Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	127448000
CY2020Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	52782000
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	123832000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	42591000
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	236404000
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	57137000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	10954948000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	10525651000
CY2021Q4	eqr	Operating And Finance Lease Right Of Use Asset OperatingAndFinanceLeaseRightOfUseAsset	474713000
CY2020Q4	eqr	Operating And Finance Lease Right Of Use Asset OperatingAndFinanceLeaseRightOfUseAsset	499287000
CY2021Q4	us-gaap	Other Assets OtherAssets	288220000
CY2020Q4	us-gaap	Other Assets OtherAssets	291426000
CY2021Q4	us-gaap	Assets Assets	21169241000
CY2020Q4	us-gaap	Assets Assets	20286891000
CY2021Q4	us-gaap	Secured Debt SecuredDebt	2191201000
CY2020Q4	us-gaap	Secured Debt SecuredDebt	2293890000
CY2021Q4	us-gaap	Notes Payable NotesPayable	5835222000
CY2020Q4	us-gaap	Notes Payable NotesPayable	5335536000
CY2021Q4	eqr	Line Of Credit And Commercial Paper LineOfCreditAndCommercialPaper	315030000
CY2020Q4	eqr	Line Of Credit And Commercial Paper LineOfCreditAndCommercialPaper	414830000
CY2021Q4	eqr	Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable	107013000
CY2020Q4	eqr	Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable	107366000
CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	69510000
CY2020Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	65896000
CY2021Q4	eqr	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	312335000
CY2020Q4	eqr	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	329130000
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	353102000
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	345064000
CY2021Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	66141000
CY2020Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	60480000
CY2021Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	233502000
CY2020Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	232262000
CY2021Q4	us-gaap	Liabilities Liabilities	9483056000
CY2020Q4	us-gaap	Liabilities Liabilities	9184454000
CY2021Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	498977000
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	338951000
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	745600
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	745600
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	745600
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	745600
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	37280000
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	37280000
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	372302000
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	3755000
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	3723000
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CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	9128599000
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1827063000
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1399715000
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-34272000
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-43666000
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	1843570000
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	1785522000
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	16769000
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	52757000
CY2020	us-gaap	Depreciation Depreciation	820832000
CY2021Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	214094000
CY2020Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	233162000
CY2021Q4	eqr	Noncontrolling Interests Partially Owned Properties NoncontrollingInterestsPartiallyOwnedProperties	18166000
CY2020Q4	eqr	Noncontrolling Interests Partially Owned Properties NoncontrollingInterestsPartiallyOwnedProperties	4673000
CY2021Q4	us-gaap	Minority Interest MinorityInterest	232260000
CY2020Q4	us-gaap	Minority Interest MinorityInterest	237835000
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	11187208000
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	10763486000
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	21169241000
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	20286891000
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2463997000
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2571705000
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CY2019	us-gaap	Depreciation Depreciation	831083000
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CY2019	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	366139000
CY2019	eqr	Cost Of Property Management CostOfPropertyManagement	95344000
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CY2020	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	531807000
CY2020	eqr	Cost Of Property Management CostOfPropertyManagement	93825000
CY2021	eqr	Cost Of Property Management CostOfPropertyManagement	98155000
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CY2021	us-gaap	Interest Expense Debt InterestExpenseDebt	272473000
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CY2019	eqr	Amortization Of Deferred Financing Costs AmortizationOfDeferredFinancingCosts	11670000
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CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1190000
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CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-9394000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-35087000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-21188000
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1406108000
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	64183000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1341925000
CY2021	us-gaap	Profit Loss ProfitLoss	1396714000
CY2021	us-gaap	Depreciation Depreciation	838272000
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	8737000
CY2021	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-154000
CY2021	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	5302000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	913636000
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3090000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1329760000
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	910546000
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	967287000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.56
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.45
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.61
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	373833000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	371791000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	370461000
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.45
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.60
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	388089000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	385874000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	386333000
CY2021	us-gaap	Profit Loss ProfitLoss	1396714000
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	50084000
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	946314000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	1332850000
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	958259000
CY2020	us-gaap	Profit Loss ProfitLoss	962501000
CY2019	us-gaap	Profit Loss ProfitLoss	1009708000
CY2020	us-gaap	Depreciation Depreciation	820832000
CY2019	us-gaap	Depreciation Depreciation	831083000
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	8939000
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	11670000
CY2020	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-71000
CY2019	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	11780000
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-71000
CY2020	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	5231000
CY2019	eqr	Gain Loss On Sales Of Land Parcels GainLossOnSalesOfLandParcels	2044000
CY2021	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	9382000
CY2021	eqr	Operating And Finance Lease Right Of Use Asset Amortization OperatingAndFinanceLeaseRightOfUseAssetAmortization	13266000
CY2019	eqr	Operating And Finance Lease Right Of Use Asset Amortization OperatingAndFinanceLeaseRightOfUseAssetAmortization	11764000
CY2021	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	23432000
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	1805000
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-287000
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-6278000
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	5116000
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	4230000
CY2021	eqr	Increase Decrease In Lease Liabilities IncreaseDecreaseInLeaseLiabilities	-5122000
CY2020	eqr	Increase Decrease In Lease Liabilities IncreaseDecreaseInLeaseLiabilities	-2204000
CY2019	eqr	Increase Decrease In Lease Liabilities IncreaseDecreaseInLeaseLiabilities	-2269000
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	4286000
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-8751000
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	13382000
CY2021	us-gaap	Increase Decrease In Security Deposits IncreaseDecreaseInSecurityDeposits	5661000
CY2020	us-gaap	Increase Decrease In Security Deposits IncreaseDecreaseInSecurityDeposits	-9582000
CY2019	us-gaap	Increase Decrease In Security Deposits IncreaseDecreaseInSecurityDeposits	2804000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1260184000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1265536000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1456984000
CY2021	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	1712131000
CY2020	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	48898000
CY2019	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	1518878000
CY2021	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	206421000
CY2020	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	230332000
CY2019	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	195692000
CY2021	eqr	Payments For Capital Expenditures To Real Estate PaymentsForCapitalExpendituresToRealEstate	151019000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	27810000
CY2020	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	35075000
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	24449000
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	15381000
CY2020	eqr	Operating And Finance Lease Right Of Use Asset Amortization OperatingAndFinanceLeaseRightOfUseAssetAmortization	11682000
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	16769000
CY2021	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	6526000
CY2019	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	5529000
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3398000
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	65945000
CY2021	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	56000
CY2021	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	1072183000
CY2020	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	531807000
CY2021	eqr	Gain Loss On Sales Of Land Parcels GainLossOnSalesOfLandParcels	5000
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-26150000
CY2020	us-gaap	Gain Loss On Sale Of Derivatives GainLossOnSaleOfDerivatives	-50000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	23174000
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-5906000
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	53021000
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	470000
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	3614000
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-956000
CY2019	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	21176000
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3284000
CY2020	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	1113972000
CY2019	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	1064619000
CY2020	eqr	Payments For Capital Expenditures To Real Estate PaymentsForCapitalExpendituresToRealEstate	135979000
CY2019	eqr	Payments For Capital Expenditures To Real Estate PaymentsForCapitalExpendituresToRealEstate	178423000
CY2021	eqr	Non Real Estate Capital Additions NonRealEstateCapitalAdditions	1696000
CY2020	eqr	Non Real Estate Capital Additions NonRealEstateCapitalAdditions	20100000
CY2019	eqr	Non Real Estate Capital Additions NonRealEstateCapitalAdditions	4955000
CY2021	eqr	Payments Of Interest Capitalized For Real Estate And Unconsolidated Entities Under Development PaymentsOfInterestCapitalizedForRealEstateAndUnconsolidatedEntitiesUnderDevelopment	15932000
CY2020	eqr	Payments Of Interest Capitalized For Real Estate And Unconsolidated Entities Under Development PaymentsOfInterestCapitalizedForRealEstateAndUnconsolidatedEntitiesUnderDevelopment	10165000
CY2019	eqr	Payments Of Interest Capitalized For Real Estate And Unconsolidated Entities Under Development PaymentsOfInterestCapitalizedForRealEstateAndUnconsolidatedEntitiesUnderDevelopment	6884000
CY2021	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	1707747000
CY2021	eqr	Payments To Acquire Equity Method Investments Other PaymentsToAcquireEquityMethodInvestmentsOther	31257000
CY2020	eqr	Payments To Acquire Equity Method Investments Other PaymentsToAcquireEquityMethodInvestmentsOther	5775000
CY2019	eqr	Payments To Acquire Equity Method Investments Other PaymentsToAcquireEquityMethodInvestmentsOther	9604000
CY2021	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	1516000
CY2020	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	1636000
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	78262000
CY2021	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	168291000
CY2020	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	773000
CY2019	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	269000
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	191398000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-434620000
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	663586000
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-771824000
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	6446000
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2923000
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	19812000
CY2021	us-gaap	Proceeds From Secured Notes Payable ProceedsFromSecuredNotesPayable	58428000
CY2020	us-gaap	Proceeds From Secured Notes Payable ProceedsFromSecuredNotesPayable	519204000
CY2019	us-gaap	Proceeds From Secured Notes Payable ProceedsFromSecuredNotesPayable	295771000
CY2021	eqr	Mortgage Notes Payable Lump Sum Pay Offs MortgageNotesPayableLumpSumPayOffs	156815000
CY2020	eqr	Mortgage Notes Payable Lump Sum Pay Offs MortgageNotesPayableLumpSumPayOffs	160522000
CY2019	eqr	Mortgage Notes Payable Lump Sum Pay Offs MortgageNotesPayableLumpSumPayOffs	743021000
CY2021	eqr	Repayments Of Mortgage Notes Payable RepaymentsOfMortgageNotesPayable	7465000
CY2020	eqr	Repayments Of Mortgage Notes Payable RepaymentsOfMortgageNotesPayable	7759000
CY2019	eqr	Repayments Of Mortgage Notes Payable RepaymentsOfMortgageNotesPayable	6808000
CY2021	us-gaap	Proceeds From Unsecured Notes Payable ProceedsFromUnsecuredNotesPayable	497470000
CY2019	us-gaap	Proceeds From Unsecured Notes Payable ProceedsFromUnsecuredNotesPayable	1194468000
CY2020	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	750000000
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1050000000
CY2021	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	10000000
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1870000000
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	6010000000
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	10000000
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1890000000
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	5990000000
CY2021	us-gaap	Proceeds From Issuance Of Commercial Paper ProceedsFromIssuanceOfCommercialPaper	7590200000
CY2020	us-gaap	Proceeds From Issuance Of Commercial Paper ProceedsFromIssuanceOfCommercialPaper	7450997000
CY2019	us-gaap	Proceeds From Issuance Of Commercial Paper ProceedsFromIssuanceOfCommercialPaper	15944800000
CY2021	us-gaap	Repayments Of Commercial Paper RepaymentsOfCommercialPaper	7690000000
CY2020	us-gaap	Repayments Of Commercial Paper RepaymentsOfCommercialPaper	8034000000
CY2019	us-gaap	Repayments Of Commercial Paper RepaymentsOfCommercialPaper	15446150000
CY2020	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	1240000
CY2019	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	41616000
CY2019	eqr	Payments Of Prepaid Finance Ground Lease PaymentsOfPrepaidFinanceGroundLease	34734000
CY2021	eqr	Finance Ground Lease Principal Payments FinanceGroundLeasePrincipalPayments	365000
CY2021	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	4265000
CY2020	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	4508000
CY2021	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	17964000
CY2020	us-gaap	Profit Loss ProfitLoss	962501000
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3090000
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3090000
CY2019	us-gaap	Profit Loss ProfitLoss	1009708000
CY2020	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	6869000
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	100000
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	2621000
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	3116000
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	85445000
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	12275000
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	77785000
CY2021	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	428000
CY2019	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	991000
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-63000
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-63000
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-80000
CY2021	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	1394000
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	417000
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	7337000
CY2020	us-gaap	Proceeds From Partnership Contribution ProceedsFromPartnershipContribution	13000
CY2019	us-gaap	Proceeds From Partnership Contribution ProceedsFromPartnershipContribution	2000
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	900468000
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	883938000
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	831111000
CY2021	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	3090000
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	3090000
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	3090000
CY2021	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	31316000
CY2020	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	32403000
CY2019	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	29615000
CY2021	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	5802000
CY2020	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	11719000
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	7078000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-565056000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1946393000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-684474000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	260508000
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-17271000
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	686000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	99728000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	116999000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	116313000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	360236000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	99728000
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	123832000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	42591000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	45753000
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	236404000
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	57137000
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	71246000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	360236000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	99728000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	116999000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	252838000
CY2020	us-gaap	Interest Paid Net InterestPaidNet	320854000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	342048000
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1179000
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1038000
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-585000
CY2021	eqr	Amortization Of Deferred Financing Costs Investment In Real Estate Net AmortizationOfDeferredFinancingCostsInvestmentInRealEstateNet	353000
CY2020	eqr	Amortization Of Deferred Financing Costs Investment In Real Estate Net AmortizationOfDeferredFinancingCostsInvestmentInRealEstateNet	240000
CY2019	eqr	Amortization Of Deferred Financing Costs Investment In Real Estate Net AmortizationOfDeferredFinancingCostsInvestmentInRealEstateNet	120000
CY2021	eqr	Amortization Of Deferred Financing Costs Other Assets AmortizationOfDeferredFinancingCostsOtherAssets	2338000
CY2020	eqr	Amortization Of Deferred Financing Costs Other Assets AmortizationOfDeferredFinancingCostsOtherAssets	2338000
CY2019	eqr	Amortization Of Deferred Financing Costs Other Assets AmortizationOfDeferredFinancingCostsOtherAssets	2987000
CY2021	eqr	Amortization Of Deferred Financing Costs Mortgage Notes Payable Net AmortizationOfDeferredFinancingCostsMortgageNotesPayableNet	2743000
CY2020	eqr	Amortization Of Deferred Financing Costs Mortgage Notes Payable Net AmortizationOfDeferredFinancingCostsMortgageNotesPayableNet	1815000
CY2019	eqr	Amortization Of Deferred Financing Costs Mortgage Notes Payable Net AmortizationOfDeferredFinancingCostsMortgageNotesPayableNet	3934000
CY2021	eqr	Amortization Of Deferred Financing Costs Notes Net AmortizationOfDeferredFinancingCostsNotesNet	4009000
CY2020	eqr	Amortization Of Deferred Financing Costs Notes Net AmortizationOfDeferredFinancingCostsNotesNet	5026000
CY2019	eqr	Amortization Of Deferred Financing Costs Notes Net AmortizationOfDeferredFinancingCostsNotesNet	4869000
CY2021	eqr	Amortization Of Discounts And Premiums On Debt Mortgage Notes Payable AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable	2764000
CY2020	eqr	Amortization Of Discounts And Premiums On Debt Mortgage Notes Payable AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable	2234000
CY2019	eqr	Amortization Of Discounts And Premiums On Debt Mortgage Notes Payable AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable	8618000
CY2021	eqr	Amortization Of Discounts And Premiums On Debt Notes Net AmortizationOfDiscountsAndPremiumsOnDebtNotesNet	2538000
CY2020	eqr	Amortization Of Discounts And Premiums On Debt Notes Net AmortizationOfDiscountsAndPremiumsOnDebtNotesNet	2997000
CY2019	eqr	Amortization Of Discounts And Premiums On Debt Notes Net AmortizationOfDiscountsAndPremiumsOnDebtNotesNet	3162000
CY2021	eqr	Amortization Of Deferred Settlements On Derivative Instruments Other Liabilities AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities	12000
CY2020	eqr	Amortization Of Deferred Settlements On Derivative Instruments Other Liabilities AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities	12000
CY2019	eqr	Amortization Of Deferred Settlements On Derivative Instruments Other Liabilities AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities	12000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-9394000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-35087000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-21188000
CY2021	eqr	Write Off Pursuit Costs Investment In Real Estate WriteOffPursuitCostsInvestmentInRealEstate	5918000
CY2020	eqr	Write Off Pursuit Costs Investment In Real Estate WriteOffPursuitCostsInvestmentInRealEstate	6566000
CY2019	eqr	Write Off Pursuit Costs Investment In Real Estate WriteOffPursuitCostsInvestmentInRealEstate	5451000
CY2021	eqr	Write Off Of Pursuit Costs Other Assets WriteOffOfPursuitCostsOtherAssets	582000
CY2020	eqr	Write Off Of Pursuit Costs Other Assets WriteOffOfPursuitCostsOtherAssets	271000
CY2019	eqr	Write Off Of Pursuit Costs Other Assets WriteOffOfPursuitCostsOtherAssets	62000
CY2021	eqr	Write Off Of Pursuit Costs Accounts Payable And Accrued Expenses WriteOffOfPursuitCostsAccountsPayableAndAccruedExpenses	26000
CY2020	eqr	Write Off Of Pursuit Costs Accounts Payable And Accrued Expenses WriteOffOfPursuitCostsAccountsPayableAndAccruedExpenses	32000
CY2019	eqr	Write Off Of Pursuit Costs Accounts Payable And Accrued Expenses WriteOffOfPursuitCostsAccountsPayableAndAccruedExpenses	16000
CY2021	eqr	Income Loss From Equity Method Investments Merger IncomeLossFromEquityMethodInvestmentsMerger	2122000
CY2020	eqr	Income Loss From Equity Method Investments Merger IncomeLossFromEquityMethodInvestmentsMerger	1995000
CY2019	eqr	Income Loss From Equity Method Investments Merger IncomeLossFromEquityMethodInvestmentsMerger	-67268000
CY2021	eqr	Other Liabilities Loss From Investments In Unconsolidated Entities Merger OtherLiabilitiesLossFromInvestmentsInUnconsolidatedEntitiesMerger	1276000
CY2020	eqr	Other Liabilities Loss From Investments In Unconsolidated Entities Merger OtherLiabilitiesLossFromInvestmentsInUnconsolidatedEntitiesMerger	1289000
CY2019	eqr	Other Liabilities Loss From Investments In Unconsolidated Entities Merger OtherLiabilitiesLossFromInvestmentsInUnconsolidatedEntitiesMerger	1323000
CY2019	eqr	Unrealized Gain Loss On Derivative Instruments Other Assets UnrealizedGainLossOnDerivativeInstrumentsOtherAssets	2002000
CY2019	eqr	Unrealized Gain Loss On Derivative Instruments Notes Net UnrealizedGainLossOnDerivativeInstrumentsNotesNet	2277000
CY2020	eqr	Unrealized Gain Loss On Derivative Instruments Other Liabilities UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities	1240000
CY2019	eqr	Unrealized Gain Loss On Derivative Instruments Other Liabilities UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities	29486000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1190000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-33765000
CY2021	eqr	Investment In Real Estate Net Under Development InvestmentInRealEstateNetUnderDevelopment	15318000
CY2020	eqr	Investment In Real Estate Net Under Development InvestmentInRealEstateNetUnderDevelopment	10165000
CY2019	eqr	Investment In Real Estate Net Under Development InvestmentInRealEstateNetUnderDevelopment	6884000
CY2021	eqr	Investments In Unconsolidated Entities Under Development InvestmentsInUnconsolidatedEntitiesUnderDevelopment	-614000
CY2021	eqr	Investment In Real Estate Net Unconsolidated Entities Other InvestmentInRealEstateNetUnconsolidatedEntitiesOther	1395000
CY2021	eqr	Investments In Unconsolidated Entities InvestmentsInUnconsolidatedEntities	30642000
CY2020	eqr	Investments In Unconsolidated Entities InvestmentsInUnconsolidatedEntities	4275000
CY2019	eqr	Investments In Unconsolidated Entities InvestmentsInUnconsolidatedEntities	7504000
CY2021	eqr	Investments In Unconsolidated Entities Other Liabilities InvestmentsInUnconsolidatedEntitiesOtherLiabilities	2010000
CY2020	eqr	Investments In Unconsolidated Entities Other Liabilities InvestmentsInUnconsolidatedEntitiesOtherLiabilities	1500000
CY2019	eqr	Investments In Unconsolidated Entities Other Liabilities InvestmentsInUnconsolidatedEntitiesOtherLiabilities	2100000
CY2021	eqr	Debt Financing Costs Other Assets DebtFinancingCostsOtherAssets	229000
CY2020	eqr	Debt Financing Costs Other Assets DebtFinancingCostsOtherAssets	-231000
CY2019	eqr	Debt Financing Costs Other Assets DebtFinancingCostsOtherAssets	-6909000
CY2021	eqr	Debt Financing Costs Mortgage Notes Payable Net DebtFinancingCostsMortgageNotesPayableNet	-2344000
CY2020	eqr	Debt Financing Costs Mortgage Notes Payable Net DebtFinancingCostsMortgageNotesPayableNet	-2692000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	116999000
CY2019	eqr	Initial Measurement And Reclassifications Lease Liabilities InitialMeasurementAndReclassificationsLeaseLiabilities	333603000
CY2019	eqr	Debt Financing Costs Mortgage Notes Payable Net DebtFinancingCostsMortgageNotesPayableNet	-2354000
CY2021	eqr	Debt Financing Costs Notes Net DebtFinancingCostsNotesNet	-4331000
CY2019	eqr	Debt Financing Costs Notes Net DebtFinancingCostsNotesNet	-10549000
CY2021	eqr	Initial Measurement And Reclassifications Right Of Use Assets InitialMeasurementAndReclassificationsRightOfUseAssets	-11308000
CY2019	eqr	Initial Measurement And Reclassifications Right Of Use Assets InitialMeasurementAndReclassificationsRightOfUseAssets	489517000
CY2019	eqr	Initial Measurement And Reclassifications Other Assets InitialMeasurementAndReclassificationsOtherAssets	184116000
CY2021	eqr	Initial Measurement And Reclassifications Lease Liabilities InitialMeasurementAndReclassificationsLeaseLiabilities	-11308000
CY2019	eqr	Initial Measurement And Reclassifications Other Liabilities InitialMeasurementAndReclassificationsOtherLiabilities	28202000
CY2021	eqr	Non Cash Share Distribution From Unconsolidated Entities Investments In Unconsolidated Entities NonCashShareDistributionFromUnconsolidatedEntitiesInvestmentsInUnconsolidatedEntities	1430000
CY2021	eqr	Non Cash Share Distribution From Unconsolidated Entities Changes In Other Assets NonCashShareDistributionFromUnconsolidatedEntitiesChangesInOtherAssets	-1430000
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	310
CY2021Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	10
CY2021Q4	us-gaap	Number Of Units In Real Estate Property NumberOfUnitsInRealEstateProperty	80407
CY2021	eqr	Lease Intangibles Average Term LeaseIntangiblesAverageTerm	P6M
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020	eqr	Remaining Amount Of Alternative Minimum Tax Refund Received RemainingAmountOfAlternativeMinimumTaxRefundReceived	1600000
CY2021	eqr	State And Local Income Franchise And Excise Tax Benefit StateAndLocalIncomeFranchiseAndExciseTaxBenefit	915000
CY2020	eqr	State And Local Income Franchise And Excise Tax Benefit StateAndLocalIncomeFranchiseAndExciseTaxBenefit	852000
CY2020Q4	eqr	Units Outstanding UnitsOutstanding	13858073
CY2019	eqr	State And Local Income Franchise And Excise Tax Benefit StateAndLocalIncomeFranchiseAndExciseTaxBenefit	963000
CY2019	eqr	Alternative Minimum Tax Credit Refund Benefit AlternativeMinimumTaxCreditRefundBenefit	-3244000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	915000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	852000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2281000
CY2019	eqr	Income Tax Refund Claims Or Receives IncomeTaxRefundClaimsOrReceives	1600000
CY2019	eqr	Term To Refund Carryover Amount TermToRefundCarryoverAmount	P4Y
CY2019	eqr	Refund Percentage Available In First Year RefundPercentageAvailableInFirstYear	0.50
CY2019	eqr	Remaining Tax Carryover Amount RemainingTaxCarryoverAmount	1600000
CY2021	eqr	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	1.40791
CY2020	eqr	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	1.34739
CY2019	eqr	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	1.39604
CY2021	eqr	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	0.73687
CY2020	eqr	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	0.77923
CY2019	eqr	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	0.61243
CY2021	eqr	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	0.26522
CY2020	eqr	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	0.24838
CY2019	eqr	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	0.23403
CY2021	eqr	Tax Treatment Of Dividends And Distributions Per Common Share Or Unit Outstanding TaxTreatmentOfDividendsAndDistributionsPerCommonShareOrUnitOutstanding	2.41000
CY2020	eqr	Tax Treatment Of Dividends And Distributions Per Common Share Or Unit Outstanding TaxTreatmentOfDividendsAndDistributionsPerCommonShareOrUnitOutstanding	2.37500
CY2019	eqr	Tax Treatment Of Dividends And Distributions Per Common Share Or Unit Outstanding TaxTreatmentOfDividendsAndDistributionsPerCommonShareOrUnitOutstanding	2.24250
CY2021Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.6025
CY2020Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.6025
CY2019Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.5675
CY2021	eqr	Alternative Minimum Tax Preference Adjustment Per Share AlternativeMinimumTaxPreferenceAdjustmentPerShare	0.06
CY2021	eqr	Alternative Minimum Tax Preference Adjustment Disclosed Under Treasury Regulation Year One Per Share AlternativeMinimumTaxPreferenceAdjustmentDisclosedUnderTreasuryRegulationYearOnePerShare	0.02650
CY2021	eqr	Alternative Minimum Tax Preference Adjustment Disclosed Under Treasury Regulation Year Three Per Share AlternativeMinimumTaxPreferenceAdjustmentDisclosedUnderTreasuryRegulationYearThreePerShare	0.00584
CY2021Q4	eqr	Land And Depreciable Property Net LandAndDepreciablePropertyNet	13200000000
CY2020Q4	eqr	Land And Depreciable Property Net LandAndDepreciablePropertyNet	13800000000
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="text-align:justify;margin-top:18pt;margin-bottom:0pt;text-indent:2.27%;font-style:italic;font-family:Times New Roman;font-size:10pt;font-weight:normal;text-transform:none;font-variant: normal;">Use of Estimates</p> <p style="text-align:justify;margin-top:6pt;margin-bottom:0pt;text-indent:4.54%;font-family:Times New Roman;font-size:10pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">In preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. </p>
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="text-align:justify;margin-top:18pt;margin-bottom:0pt;text-indent:2.27%;font-style:italic;font-family:Times New Roman;font-size:10pt;font-weight:normal;text-transform:none;font-variant: normal;">Reclassifications</p> <p style="text-align:justify;margin-top:6pt;margin-bottom:0pt;text-indent:4.54%;font-family:Times New Roman;font-size:10pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Certain reclassifications considered necessary for a fair presentation have been made to the prior period financial statements in order to conform to the current year presentation. These reclassifications have not changed the results of operations or equity/capital.</p>
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	372302000
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	371670884
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	369405161
CY2021	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	1354208
CY2020	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	122505
CY2019	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	313940
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1710692
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	239695
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1745050
CY2021	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	70702
CY2020	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	90196
CY2019	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	48131
CY2021	eqr	Restricted Share Grants Net RestrictedShareGrantsNet	89593
CY2020	eqr	Restricted Share Grants Net RestrictedShareGrantsNet	178720
CY2019	eqr	Restricted Share Grants Net RestrictedShareGrantsNet	158602
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	375527195
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	372302000
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	371670884
CY2019Q4	eqr	Units Outstanding UnitsOutstanding	13731315
CY2019Q4	eqr	Units Outstanding UnitsOutstanding	13731315
CY2018Q4	eqr	Units Outstanding UnitsOutstanding	13904035
CY2021	eqr	Issuance Of Ltips IssuanceOfLtips	155162
CY2020	eqr	Issuance Of Ltips IssuanceOfLtips	249263
CY2019	eqr	Issuance Of Ltips IssuanceOfLtips	141220
CY2021	eqr	Shares Issued During Period Shares Conversion Of Units To Common Shares SharesIssuedDuringPeriodSharesConversionOfUnitsToCommonShares	1354208
CY2020	eqr	Shares Issued During Period Shares Conversion Of Units To Common Shares SharesIssuedDuringPeriodSharesConversionOfUnitsToCommonShares	122505
CY2019	eqr	Shares Issued During Period Shares Conversion Of Units To Common Shares SharesIssuedDuringPeriodSharesConversionOfUnitsToCommonShares	313940
CY2021Q4	eqr	Units Outstanding UnitsOutstanding	12659027
CY2020Q4	eqr	Units Outstanding UnitsOutstanding	13858073
CY2021Q4	eqr	Common Shares And Units Outstanding CommonSharesAndUnitsOutstanding	388186222
CY2020Q4	eqr	Common Shares And Units Outstanding CommonSharesAndUnitsOutstanding	386160073
CY2019Q4	eqr	Common Shares And Units Outstanding CommonSharesAndUnitsOutstanding	385402199
CY2021Q4	eqr	Units Ownership Interest In Operating Partnership UnitsOwnershipInterestInOperatingPartnership	0.033
CY2020Q4	eqr	Units Ownership Interest In Operating Partnership UnitsOwnershipInterestInOperatingPartnership	0.036
CY2019Q4	eqr	Units Ownership Interest In Operating Partnership UnitsOwnershipInterestInOperatingPartnership	0.036
CY2020Q4	eqr	Redeemable Limited Partners RedeemableLimitedPartners	338951000
CY2020Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	338951000
CY2019Q4	eqr	Redeemable Limited Partners RedeemableLimitedPartners	463400000
CY2019Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	463400000
CY2018Q4	eqr	Redeemable Limited Partners RedeemableLimitedPartners	379106000
CY2018Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	379106000
CY2021	eqr	Limited Partners Change In Redemption Value LimitedPartnersChangeInRedemptionValue	158598000
CY2021	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	158598000
CY2020	eqr	Limited Partners Change In Redemption Value LimitedPartnersChangeInRedemptionValue	-125224000
CY2020	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-125224000
CY2019	eqr	Limited Partners Change In Redemption Value LimitedPartnersChangeInRedemptionValue	82283000
CY2019	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	82283000
CY2021	eqr	Limited Partners Change In Carrying Value LimitedPartnersChangeInCarryingValue	1428000
CY2021	eqr	Minority Interest Change In Carrying Value MinorityInterestChangeInCarryingValue	1428000
CY2020	eqr	Limited Partners Change In Carrying Value LimitedPartnersChangeInCarryingValue	775000
CY2020	eqr	Minority Interest Change In Carrying Value MinorityInterestChangeInCarryingValue	775000
CY2019	eqr	Limited Partners Change In Carrying Value LimitedPartnersChangeInCarryingValue	2011000
CY2019	eqr	Minority Interest Change In Carrying Value MinorityInterestChangeInCarryingValue	2011000
CY2021Q4	eqr	Redeemable Limited Partners RedeemableLimitedPartners	498977000
CY2021Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	498977000
CY2020Q4	eqr	Redeemable Limited Partners RedeemableLimitedPartners	338951000
CY2020Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	338951000
CY2019Q4	eqr	Redeemable Limited Partners RedeemableLimitedPartners	463400000
CY2020Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	339000000.0
CY2019Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	463400000
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000
CY2021Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	13000000.0
	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0
	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0
CY2021Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	13000000.0
CY2021Q4	us-gaap	Land Land	5814790000
CY2020Q4	us-gaap	Land Land	5785367000
CY2021Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	19632284000
CY2020Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	18464484000
CY2021Q4	us-gaap	Fixtures And Equipment Gross FixturesAndEquipmentGross	2220203000
CY2020Q4	us-gaap	Fixtures And Equipment Gross FixturesAndEquipmentGross	1970033000
CY2021Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	518324000
CY2020Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	486137000
CY2021Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	28272906000
CY2020Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	27203325000
CY2021Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	8354282000
CY2020Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	7859657000
CY2021Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	19918624000
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	19343668000
CY2021	eqr	Properties Acquired PropertiesAcquired	17
CY2021	eqr	Property Units Acquired PropertyUnitsAcquired	4747
CY2021	us-gaap	Asset Acquisition Consideration Transferred AssetAcquisitionConsiderationTransferred	1709379000
CY2020	eqr	Properties Acquired PropertiesAcquired	1
CY2020	eqr	Property Units Acquired PropertyUnitsAcquired	158
CY2020	us-gaap	Asset Acquisition Consideration Transferred AssetAcquisitionConsiderationTransferred	48860000
CY2021	eqr	Disposed Properties DisposedProperties	14
CY2021	eqr	Disposed Units DisposedUnits	3053
CY2021	eqr	Proceeds From Sale Of Property ProceedsFromSaleOfProperty	1716775000
CY2021	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	1100000000
CY2020	eqr	Disposed Properties DisposedProperties	6
CY2020	eqr	Disposed Units DisposedUnits	2231
CY2020	eqr	Proceeds From Sale Of Property ProceedsFromSaleOfProperty	1122371000
CY2020	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	531800000
CY2020	eqr	Gain Loss On Sales Of Land Parcels GainLossOnSalesOfLandParcels	34200000
CY2021Q4	eqr	Units Contracted To Be Disposed UnitsContractedToBeDisposed	490
CY2021Q4	eqr	Sales Price For Commitments To Dispose SalesPriceForCommitmentsToDispose	331150000
CY2021Q4	eqr	Properties Contracted To Be Disposed PropertiesContractedToBeDisposed	2
CY2021Q4	us-gaap	Sale Leaseback Transaction Net Book Value SaleLeasebackTransactionNetBookValue	191196000
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	127448000
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	52782000
CY2021Q4	us-gaap	Replacement Reserve Escrow ReplacementReserveEscrow	11156000
CY2020Q4	us-gaap	Replacement Reserve Escrow ReplacementReserveEscrow	9877000
CY2021Q4	us-gaap	Debt Instrument Cumulative Sinking Fund Payments DebtInstrumentCumulativeSinkingFundPayments	19104000
CY2020Q4	us-gaap	Debt Instrument Cumulative Sinking Fund Payments DebtInstrumentCumulativeSinkingFundPayments	14168000
CY2021Q4	eqr	Escrow Deposits For Mortgage And Replacement Reserves EscrowDepositsForMortgageAndReplacementReserves	30260000
CY2020Q4	eqr	Escrow Deposits For Mortgage And Replacement Reserves EscrowDepositsForMortgageAndReplacementReserves	24045000
CY2021Q4	eqr	Tax Deferred Exchange Proceeds TaxDeferredExchangeProceeds	166362000
CY2021Q4	eqr	Earnest Money On Pending Acquisitions EarnestMoneyOnPendingAcquisitions	2000000
CY2021Q4	eqr	Restricted Deposits On Real Estate Investments RestrictedDepositsOnRealEstateInvestments	284000
CY2020Q4	eqr	Restricted Deposits On Real Estate Investments RestrictedDepositsOnRealEstateInvestments	307000
CY2021Q4	eqr	Resident Security And Utility Deposits ResidentSecurityAndUtilityDeposits	35663000
CY2020Q4	eqr	Resident Security And Utility Deposits ResidentSecurityAndUtilityDeposits	31412000
CY2021Q4	eqr	Other Restricted Cash OtherRestrictedCash	1835000
CY2020Q4	eqr	Other Restricted Cash OtherRestrictedCash	1373000
CY2021Q4	us-gaap	Restricted Cash RestrictedCash	206144000
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	33092000
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	236404000
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	57137000
CY2021	eqr	Operating Lease Lease Income Loss OperatingLeaseLeaseIncomeLoss	2364447000
CY2020	eqr	Operating Lease Lease Income Loss OperatingLeaseLeaseIncomeLoss	2464790000
CY2019	eqr	Operating Lease Lease Income Loss OperatingLeaseLeaseIncomeLoss	2593829000
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2463997000
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2571705000
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2700691000
CY2021Q4	eqr	Holding Percentage Of Residential Security Deposits Of Net Receivables HoldingPercentageOfResidentialSecurityDepositsOfNetReceivables	0.482
CY2021	eqr	Operating Lease Lease Income Bad Debt Net From Resident Payments OperatingLeaseLeaseIncomeBadDebtNetFromResidentPayments	34800000
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	474713000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	499287000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	312335000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	329130000
CY2021	eqr	Increase Decrease In Lease Liabilities Due To Change In Classification IncreaseDecreaseInLeaseLiabilitiesDueToChangeInClassification	11300000
CY2021	eqr	Increase Decrease In Rou Assets IncreaseDecreaseInROUAssets	11300000
CY2021	eqr	Finance Lease Right Of Use Asset Amortization Capitalized FinanceLeaseRightOfUseAssetAmortizationCapitalized	351000
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1391000
CY2021	eqr	Finance Lease Interest Expense Capitalized FinanceLeaseInterestExpenseCapitalized	452000
CY2020	eqr	Finance Lease Interest Expense Capitalized FinanceLeaseInterestExpenseCapitalized	1029000
CY2019	eqr	Finance Lease Interest Expense Capitalized FinanceLeaseInterestExpenseCapitalized	225000
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1464000
CY2021	us-gaap	Lease Cost LeaseCost	29587000
CY2020	us-gaap	Lease Cost LeaseCost	31489000
CY2019	us-gaap	Lease Cost LeaseCost	31549000
CY2021	us-gaap	Operating Lease Payments Use OperatingLeasePaymentsUse	383000
CY2020	us-gaap	Operating Lease Payments Use OperatingLeasePaymentsUse	567000
CY2019	us-gaap	Operating Lease Payments Use OperatingLeasePaymentsUse	188000
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1898000
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	34734000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	23201000
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P25Y2M12D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P18Y8M12D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P19Y8M12D
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.028
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.030
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.030
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	2463000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2662000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2880000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2946000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2959000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	88209000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	102119000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	15090000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	14998000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	15131000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	14957000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	14843000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	831456000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	906475000
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	58561000
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	56754000
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	51295000
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	45091000
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	37283000
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	135922000
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	384906000
CY2021Q4	eqr	Lessee Operating And Financing Lease Liability Payments Due LesseeOperatingAndFinancingLeaseLiabilityPaymentsDue	1008594000
CY2021Q4	eqr	Lessee Operating And Financing Lease Liability Undiscounted Excess Amount LesseeOperatingAndFinancingLeaseLiabilityUndiscountedExcessAmount	-696259000
CY2021Q4	eqr	Operating And Financing Lease Liability OperatingAndFinancingLeaseLiability	312335000
CY2020Q4	us-gaap	Secured Debt SecuredDebt	2293890000
CY2021	us-gaap	Proceeds From Secured Notes Payable ProceedsFromSecuredNotesPayable	58428000
CY2021	eqr	Mortgage Notes Payable Lump Sum Pay Offs MortgageNotesPayableLumpSumPayOffs	156815000
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7465000
CY2021	eqr	Amortization Of Discounts And Premiums On Debt Mortgage Notes Payable AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable	2764000
CY2021	eqr	Amortization Of Deferred Financing Costs Net Mortgage Notes Payable Net AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet	399000
CY2021Q4	us-gaap	Secured Debt SecuredDebt	2191201000
CY2019Q4	us-gaap	Secured Debt SecuredDebt	1941610000
CY2020	us-gaap	Proceeds From Secured Notes Payable ProceedsFromSecuredNotesPayable	519204000
CY2020	eqr	Mortgage Notes Payable Lump Sum Pay Offs MortgageNotesPayableLumpSumPayOffs	160522000
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7759000
CY2020	eqr	Amortization Of Discounts And Premiums On Debt Mortgage Notes Payable AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable	2234000
CY2020	eqr	Amortization Of Deferred Financing Costs Net Mortgage Notes Payable Net AmortizationOfDeferredFinancingCostsNetMortgageNotesPayableNet	-877000
CY2020Q4	us-gaap	Secured Debt SecuredDebt	2293890000
CY2021Q4	eqr	Historical Cost Net Of Accumulated Depreciation Of Encumbered Properties HistoricalCostNetOfAccumulatedDepreciationOfEncumberedProperties	2700000000
CY2020Q4	eqr	Historical Cost Net Of Accumulated Depreciation Of Encumbered Properties HistoricalCostNetOfAccumulatedDepreciationOfEncumberedProperties	2900000000
CY2021	eqr	Effective Date Of Securities Under Shelf Registration Statement EffectiveDateOfSecuritiesUnderShelfRegistrationStatement	2019-06
CY2021	eqr	Expiry Date Of Securities Remaining Under Shelf Registration Statement ExpiryDateOfSecuritiesRemainingUnderShelfRegistrationStatement	2022-06
CY2020	us-gaap	Debt Instrument Maturity Date DebtInstrumentMaturityDate	2024-11-01
CY2019Q4	eqr	Commercial Paper Maximum Available CommercialPaperMaximumAvailable	1000000000.0
CY2021Q4	eqr	Commercial Paper Maximum Available CommercialPaperMaximumAvailable	1000000000.0
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	601025000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	5385670000
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	8421172000
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	79719000
CY2021Q4	us-gaap	Commercial Paper CommercialPaper	315100000
CY2021	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	23400000
CY2021Q4	us-gaap	Marketable Securities MarketableSecurities	0
CY2021Q4	eqr	Total Secured And Unsecured Debt TotalSecuredAndUnsecuredDebt	8341453000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1329088000
CY2021Q4	us-gaap	Other Liabilities Fair Value Disclosure OtherLiabilitiesFairValueDisclosure	164650000
CY2021Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	498977000
CY2020Q4	eqr	Fair Value Of Serp Investments FairValueOfSerpInvestments	160293000
CY2020Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	338951000
CY2019	us-gaap	Increase Decrease In Fair Value Of Interest Rate Fair Value Hedging Instruments1 IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1	2277000
CY2019	us-gaap	Increase Decrease In Fair Value Of Hedged Item In Interest Rate Fair Value Hedge1 IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1	-2277000
CY2021	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-9394000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-1190000
CY2020	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-35087000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-33765000
CY2019	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-21188000
CY2021	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-34300000
CY2020	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-43700000
CY2021Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	10600000
CY2019Q3	eqr	Number Of Interest Rate Swaps Matured NumberOfInterestRateSwapsMatured	6
CY2021	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1396714000
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	962501000
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1009708000
CY2021	us-gaap	Income Loss Attributable To Noncontrolling Interest IncomeLossAttributableToNoncontrollingInterest	45900000
CY2020	us-gaap	Income Loss Attributable To Noncontrolling Interest IncomeLossAttributableToNoncontrollingInterest	34010000
CY2019	us-gaap	Income Loss Attributable To Noncontrolling Interest IncomeLossAttributableToNoncontrollingInterest	36034000
CY2021	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	17964000
CY2020	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	14855000
CY2019	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	3297000
CY2021	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3090000
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3090000
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3090000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1329760000
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	910546000
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	967287000
CY2021	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1396714000
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	962501000
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1009708000
CY2021	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	17964000
CY2020	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	14855000
CY2019	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	3297000
CY2021	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3090000
CY2021	eqr	Share Based Compensation Arrangements By Share Based Payment Award Percent Of Award Target Performance Metric ShareBasedCompensationArrangementsByShareBasedPaymentAwardPercentOfAwardTargetPerformanceMetric	0.50
CY2021Q4	eqr	Percentage Of Dividend Payments PercentageOfDividendPayments	0.10
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3090000
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3090000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1375660000
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	944556000
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1003321000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	373833000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	371791000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	370461000
CY2021	eqr	Dilutive Op Units DilutiveOpUnits	12263000
CY2020	eqr	Dilutive Op Units DilutiveOpUnits	13003000
CY2019	eqr	Dilutive Op Units DilutiveOpUnits	12907000
CY2021	eqr	Dilutive Securities Options DilutiveSecuritiesOptions	1924000
CY2020	eqr	Dilutive Securities Options DilutiveSecuritiesOptions	1080000
CY2019	eqr	Dilutive Securities Options DilutiveSecuritiesOptions	2965000
CY2021	eqr	At The Market Forward Sales AtTheMarketForwardSales	69000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	388089000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	385874000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	386333000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.56
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.45
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.61
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.45
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.60
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	9539478
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.213
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.152
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.163
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0323
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0304
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0310
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0050
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0132
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0243
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice	67.48
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice	83.08
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice	72.02
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	7.96
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	7.23
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	8.06
CY2021	eqr	Individual Potential Target Award Minimum IndividualPotentialTargetAwardMinimum	0
CY2021	eqr	Individual Potential Target Award Maximum IndividualPotentialTargetAwardMaximum	2
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	27810000
CY2021	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1430000
CY2021	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	1038000
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30278000
CY2021	eqr	Share Incentive Plans Dividends Incurred ShareIncentivePlansDividendsIncurred	2015000
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	23174000
CY2020	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1527000
CY2020	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	1743000
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	26444000
CY2020	eqr	Share Incentive Plans Dividends Incurred ShareIncentivePlansDividendsIncurred	3027000
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	24449000
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1450000
CY2019	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	3266000
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	29165000
CY2019	eqr	Share Incentive Plans Dividends Incurred ShareIncentivePlansDividendsIncurred	1804000
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	8600000
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y4M13D
CY2021Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	4387833
CY2021Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	60.65
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	130999000
CY2021Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	3710888
CY2021Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	58.70
CY2021Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	118015000
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	666334
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	71.33
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue	12775000
CY2021Q4	eqr	Market Value Of Common Shares MarketValueOfCommonShares	90.50
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	4985668
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	55.12
CY2021	eqr	Share Based Compensation Arrangement By Share Based Payment Award Value Of Common Shares That Can Be Acquired By Employee And Trustees Under Employees Share Purchase Plan ShareBasedCompensationArrangementByShareBasedPaymentAwardValueOfCommonSharesThatCanBeAcquiredByEmployeeAndTrusteesUnderEmployeesSharePurchasePlan	100000
CY2021Q4	eqr	Sharebasedcompensationarrangementbysharebasedpaymentawardnumberofsharesauthorizedafteramendment Sharebasedcompensationarrangementbysharebasedpaymentawardnumberofsharesauthorizedafteramendment	7000000
CY2021Q4	eqr	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Purchase Under Employee Share Purchase Plan ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForPurchaseUnderEmployeeSharePurchasePlan	2553434
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Purchase Date ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate	0.85
CY2019	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	400000
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod	70702
CY2021	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	4265000
CY2021	eqr	Maximum Eligible Compensation Percentage For Defined Contribution Plan By Employer MaximumEligibleCompensationPercentageForDefinedContributionPlanByEmployer	0.04
CY2021	eqr	Defined Contribution Plan Vesting Period DefinedContributionPlanVestingPeriod	P5Y
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4900000
CY2014Q3	eqr	Stock Registered During Period Shares Dividend Reinvestment Plan StockRegisteredDuringPeriodSharesDividendReinvestmentPlan	4790000
CY2021	eqr	Equity Method Investment Period EquityMethodInvestmentPeriod	P3Y
CY2021Q4	eqr	Percentage Of Expected Non Recourse Construction Debt PercentageOfExpectedNonRecourseConstructionDebt	0.60
CY2021Q4	eqr	Initial Minimum Co Investment Of Combined Equity InitialMinimumCoInvestmentOfCombinedEquity	750000000.0
CY2021	eqr	Number Of Joint Venture Agreements NumberOfJointVentureAgreements	3
CY2021	eqr	Number Of Joint Venture Agreements NumberOfJointVentureAgreements	3
CY2021	eqr	Number Of Deferred Compensation Agreement With Former Executive Officer NumberOfDeferredCompensationAgreementWithFormerExecutiveOfficer	1
CY2021	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	100000
CY2020	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	500000
CY2020	eqr	Real Estate Acquisitions And Development RealEstateAcquisitionsAndDevelopment	298847000
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	27203325000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	773000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	1013000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	732000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	732000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	732000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	4023000
CY2021Q4	eqr	Defined Benefit Plan Expected Future Benefit Payments DefinedBenefitPlanExpectedFutureBenefitPayments	8005000
CY2021Q4	eqr	Number Of Customer NumberOfCustomer	0
CY2020Q4	eqr	Number Of Customer NumberOfCustomer	0
CY2019Q4	eqr	Number Of Customer NumberOfCustomer	0
CY2020	eqr	Number Of Units In Same Store Properties NumberOfUnitsInSameStoreProperties	74077
CY2021	eqr	Number Of Units In Same Store Properties NumberOfUnitsInSameStoreProperties	74077
CY2019	eqr	Number Of Units In Same Store Properties NumberOfUnitsInSameStoreProperties	73585
CY2020	eqr	Number Of Units In Same Store Properties NumberOfUnitsInSameStoreProperties	74077
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	27533607000
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	26511022000
CY2021	eqr	Real Estate Acquisitions And Development RealEstateAcquisitionsAndDevelopment	1912579000
CY2020	us-gaap	Real Estate Improvements RealEstateImprovements	154433000
CY2019	eqr	Real Estate Acquisitions And Development RealEstateAcquisitionsAndDevelopment	1704320000
CY2021	us-gaap	Real Estate Improvements RealEstateImprovements	152715000
CY2019	us-gaap	Real Estate Improvements RealEstateImprovements	180944000
CY2021	eqr	Real Estate Dispositions And Other RealEstateDispositionsAndOther	995713000
CY2020	eqr	Real Estate Dispositions And Other RealEstateDispositionsAndOther	783562000
CY2019	eqr	Real Estate Dispositions And Other RealEstateDispositionsAndOther	862679000
CY2021Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	28272906000
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	27203325000
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	27533607000
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	7859657000
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	7276786000
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	6696281000
CY2021	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	838272000
CY2020	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	820832000
CY2019	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	831083000
CY2021	eqr	Real Estate Accumulated Depreciation Dispositions And Other RealEstateAccumulatedDepreciationDispositionsAndOther	343647000
CY2020	eqr	Real Estate Accumulated Depreciation Dispositions And Other RealEstateAccumulatedDepreciationDispositionsAndOther	237961000
CY2019	eqr	Real Estate Accumulated Depreciation Dispositions And Other RealEstateAccumulatedDepreciationDispositionsAndOther	250578000
CY2021Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	8354282000
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	7859657000
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	7276786000
CY2021Q4	eqr	Land And Depreciable Property Net LandAndDepreciablePropertyNet	13200000000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	641089000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	458200000
CY2021	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	48534000
CY2021Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	499000000.0
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	6100000

Files In Submission

Name	View Source	Status
0001564590-22-005566-index-headers.html	Edgar Link	pending
0001564590-22-005566-index.html	Edgar Link	pending
0001564590-22-005566.txt	Edgar Link	pending
0001564590-22-005566-xbrl.zip	Edgar Link	pending
eqr-10k_20211231.htm	Edgar Link	pending
eqr-10k_20211231_htm.xml	Edgar Link	completed
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$EQR
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2021 Q4 Form 10-K Financial Statement

#000156459022005566 Filed on February 17, 2022

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$EQR EQUITY RESIDENTIAL Stock $eqr

2021 Q4 Form 10-K Financial Statement

#000156459022005566 Filed on February 17, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EQR
EQUITY RESIDENTIAL Stock $eqr