Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Net income - diluted Net Income (Loss) Available to Common Stockholders, Diluted Unconsolidated investments Payments to Acquire Businesses and Interest in Affiliates Document Fiscal Year Focus Document Fiscal Year Focus Acquisition-related cost, expense Business Combination, Acquisition-Related Cost, Expense Weighted average interest rate, debt (as a percent) Debt, Weighted Average Interest Rate Change in awards based on performance (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Change In Awards Based On Performance, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in Awards Based on Performance, Weighted Average Grant Date Fair Value Adjustment to Compensation, Amount Adjustment to Compensation Amount Pledged Status [Axis] Pledged Status [Axis] Performance awards Restricted stock shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] Segment Reporting [Abstract] Utilities Segment Reporting, Utilities Segment Reporting, Utilities Segment Operating Expenses [Domain] Segment Operating Expenses [Domain] Segment Operating Expenses [Domain] Equity in loss of, and return on, unconsolidated investments and noncontrolling interests, net of eliminations Gain (Loss) Unconsolidated Real Estate Entities, Net of Dividends or Distributions Gain (Loss) Unconsolidated Real Estate Entities, Net of Dividends or Distributions Common stock, $0.01 par value; 280,000,000 shares authorized at June 30, 2026 and December 31, 2025; 141,875,567 and 140,080,657 shares issued and outstanding at June 30, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Payments related to tax withholding for share-based compensation Payment, Tax Withholding, Share-Based Payment Arrangement Interest expense, net Interest Expense, Operating and Nonoperating Notes Payable Maturities 2034 Notes Payable Maturities 2034 [Member] Notes Payable Maturities 2034 Management, development and other fees and other ancillary items Management, Development And Other [Member] Management, Development And Other [Member] Summary of company's mortgage notes payable, unsecured notes and Credit Facility excluding mortgage notes secured by communities classified as held for sale Schedule of Long-Term Debt Instruments [Table Text Block] Commitments and Contingencies Lessee, Finance Leases [Text Block] Properties on Land Subject to Land Leases Properties on Land Subject to Land Leases [Member] Real estate assets located on land subject to land leases. Credit Facility Line of Credit [Member] Right of use lease assets Lease, Right-Of-Use Asset Lease, Right-Of-Use Asset Restatement Determination Date Restatement Determination Date Unconsolidated investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Derivative Instrument [Axis] Derivative Instrument [Axis] Net borrowings under unsecured credit facility and commercial paper Proceeds From (Repayments of) Long-term Line of Credit And Commercial Paper Proceeds From (Repayments of) Long-term Line of Credit And Commercial Paper Measurement Frequency [Axis] Measurement Frequency [Axis] Notes Payable 4.1500 Maturities 2047 Notes Payable 4.150 Maturities 2047 [Member] Notes Payable 4.150 Maturities 2047 Notes Payable 5.300 Maturities 2033 Notes Payable 5.300 Maturities 2033 [Member] Notes Payable 5.300 Maturities 2033 Amendment Flag Amendment Flag Average cost for shares Acquired (in dollars per share) Shares Acquired, Average Cost Per Share Uncollectible lease revenue Accounts Receivable, Credit Loss Expense (Reversal) Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Interest Capitalized Interest Capitalized Disclosure [Text Block] Information about the amount of total interest cost capitalized in conjunction with assets that are being constructed for sale or lease during the periods presented. Less accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Operating expenses, excluding property taxes Cost of Other Property Operating Expense Other real estate activity Other real estate activity Gain (Loss) on Disposition of Other Assets Leases [Abstract] Leases [Abstract] Related Party Arrangements Related Party Transactions Disclosure [Text Block] Abandonment of development pursuits, net of recoveries Noncash Project Abandonment Costs Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Reclassification out of Accumulated Other Comprehensive Income 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Consolidation Items [Domain] Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Avalon Mission Valley Avalon Mission Valley [Member] Avalon Mission Valley Variable rate mortgage notes payable—conventional and tax-exempt Variable Rate Mortgage Notes Payable [Member] Represents information pertaining to variable rate mortgage notes payable. Finance lease asset Finance Lease, Right-of-Use Asset, after Accumulated Amortization Debt instrument, basis spread on variable rate, increase (decrease) Debt Instrument, Basis Spread On Variable Rate, Increase (Decrease) Debt Instrument, Basis Spread On Variable Rate, Increase (Decrease) Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Earnings per Common Share Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Number of repaid commitments Other Commitments, Number of Repaid Commitments Other Commitments, Number of Repaid Commitments Geographical [Domain] Geographical [Domain] Non-Same Store Operating Expense Non Same Store Operating Expense [Member] Non Same Store Operating Expense Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Organization and Basis of Presentation Organization And Basis of Presentation Policy [Policy Text Block] Organization And Basis of Presentation Policy Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Fixed rate mortgage notes payable—conventional and tax-exempt Fixed Rate Mortgage Notes Payable [Member] Represents information pertaining to fixed rate mortgage notes payable. Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Gross real estate assets non-allocated Gross Real Estate Assets Non-allocated Gross Real Estate Assets Non-allocated Implied volatility (as a percent) Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Implied Volatility Rate The implied volatility rate used in valuation technique of calculation of fair value of awards. Amortization of deferred financing costs and debt discount Amortization of Debt Issuance Costs and Discounts Avalon The Albemarle Avalon the Albemarle [Member] Avalon the Albemarle Earnings per common share - diluted: Earnings Per Share, Diluted [Abstract] Earnings Per Share, Diluted [Abstract] Other Letter of Credit Other Letter of Credit [Member] Other Letter of Credit [Member] Income (loss) from unconsolidated investments (Income) loss from unconsolidated investments Unconsolidated Real Estate Entities Gain (loss) on investments Unconsolidated Real Estate Entities Gain (loss) on investments Total principal outstanding Long-Term Debt, Gross Non employee director Non Employee Director [Member] Represents non-employee directors of the entity. Number of finance leases for parking garages adjacent to communities Number Of Finance Leases For Parking Garages Adjacent To Communities Number of Finance Leases for Parking Garages Adjacent to Communities Annual facility fee, percentage Line of Credit Facility, Commitment Fee Percentage Related Party Transactions [Abstract] Related Party Transactions [Abstract] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average common shares - diluted (in shares) Weighted average common shares - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Arrangements Related Party Transaction [Line Items] Disposal Group Name [Domain] Disposal Group Name [Domain] Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Dividends declared to noncontrolling interests Dividends Reconciliation of NOI to net income Reconciliation of Net Operating Income to Net Income [Abstract] Commercial paper Commercial Paper [Member] Dividends payable Dividends Payable Stock Option and Incentive Plan 2009 Stock Option and Incentive Plan 2009 [Member] Stock Option and Incentive Plan 2009 Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Dividends payable, common stock and DownREIT unit Dividends Payable, Common Stock and DownREIT Unit Dividends Payable, Common Stock and DownREIT Unit Notes Payable 3.900 Maturities 2046 Notes Payable 3.900 Maturities 2046 [Member] Notes Payable 3.900 Maturities 2046 Continuing Operations Continuing Operations [Member] Effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Other commitment, new Other Commitment, New Other Commitment, New Award Timing Predetermined Award Timing Predetermined [Flag] Capital expenditures - existing real estate assets Payments for Capital Improvements Letters of credit outstanding Letters of Credit Outstanding, Amount Repayment of unsecured debt Repayment of unsecured debt Repayments of Unsecured Debt Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Amortization of deferred compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Gross Real Estate Real Estate Gross At Carrying Value Excluding Gross Real Estate Assets Held For Sale Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate, excluding gross real estate assets held for sale. Commercial paper, maximum borrowing capacity Commercial Paper, Maximum Borrowing Capacity Commercial Paper, Maximum Borrowing Capacity Equity instruments outstanding at the beginning of the period (in dollars per share) Equity instruments outstanding at the end of the period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value All Executive Categories All Executive Categories [Member] Number of states where operating apartment communities owned are located Number of States in which Entity Operates Repurchase of common stock, including repurchase costs Stock Repurchased and Retired During Period, Value Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Indebtedness Long-Term Debt, Fair Value Restricted stock and deferred stock awards Deferred Compensation, Share-Based Payments [Member] Depreciation expense Depreciation Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Weighted average exercise price of options outstanding at beginning of period (in dollars per share) Weighted average exercise price of options outstanding at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Operating lease assets Operating Lease, Right-of-Use Asset Number of reportable segments not disclosed flag Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Former AvalonBay Stockholders Former AvalonBay Stockholders [Member] Former AvalonBay Stockholders Concentration Risk Type [Domain] Concentration Risk Type [Domain] Notes Payable Maturities 2032 Notes Payable Maturities 2032 [Member] Notes Payable Maturities 2032 Schedule of earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Risk-free rate, maximum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] Credit Facility Credit Facility outstanding Long-Term Line of Credit Expiration Date Trading Arrangement Expiration Date Hedging Relationship [Axis] Hedging Relationship [Axis] Disaggregation of revenue Disaggregation of Revenue [Table Text Block] Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Employee and Directors Stock Options Employee and Directors Stock Options [Member] Employee and Directors Stock Options Restricted cash Restricted Cash and Cash Equivalent Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Notes Payable 4.3500 Maturities 2030 Notes Payable 4.350 Maturities 2030 [Member] Notes Payable 4.350 Maturities 2030 Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Financial metrics (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Financial Metrics Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Financial Metrics Real Estate Property, Ownership [Table] Real Estate Property, Ownership [Table] Estimated performance award value based on total shareholder return measure (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price Uncollectible Lease Revenue Reserves Revenue Recognition, Leases [Policy Text Block] Repayments of mortgage notes payable, including prepayment penalties Repayments of Notes Payable Disposal Group, Including Discontinued Operations [Line Items] Disposal Group, Including Discontinued Operations [Line Items] Dividends declared to common stockholders Dividends, Common Stock Unsecured debt, net Unsecured Debt Options Exerciseable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Issuance of common stock, net Proceeds from Issuance of Common Stock Common stock, shares authorized (in shares) Common Stock, Shares Authorized Total real estate, net Net carrying value of apartment communities and improved land parcels securing debt Real Estate Investment Property, Net Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Schedule of restricted stock granted Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] Number of apartment homes included in operating apartment communities owned Number of Units in Real Estate Property Number of communities held for sale Number Of Communities Held For Sale Number of Communities Held for Sale Notes Payable Maturities 2031 Notes Payable Maturities 2031 [Member] Notes Payable Maturities 2031 [Member] Exercise Price Award Exercise Price Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Recurring basis Fair Value, Recurring [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Equity method investment Schedule of Equity Method Investments [Line Items] Notes Payable 3.350 Maturities 2027 Notes Payable 3.350 Maturities 2027 [Member] Notes Payable 3.350 Maturities 2027 Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Segment Reporting [Line Items] Segment Reporting Segment Reporting [Line Items] Stock repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Other commitment, outstanding funding Other Commitment, Outstanding Funding Other Commitment, Outstanding Funding Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Interest Rate Swap Interest Rate Swap [Member] Debt Debt Disclosure [Text Block] Restricted stock and restricted stock units Restricted Stock and Restricted Stock Units [Member] Represents information pertaining to restricted stock and restricted stock units. Accrued interest payable Interest Payable Stock issued during period, shares, share-based compensation, forfeited (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited Converted to restricted stock (in shares) Converted to shares of common stock (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Converted To Common Shares Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Converted To Common Shares Operating Activities [Domain] Operating Activities [Domain] Preferred stock, liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share Deferred financing costs and debt discount Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Investments Real Estate Disclosure [Text Block] Non-lease related revenue Rental And Non-Rental [Member] Rental And Non-Rental [Member] eaves Tysons Corner eaves Tysons Corner [Member] eaves Tysons Corner Forward contract indexed to issuer's equity, net proceeds Forward Contract Indexed To Issuer's Equity, Net Proceeds Forward Contract Indexed To Issuer's Equity, Net Proceeds Equity Component [Domain] Equity Component [Domain] Property management and other indirect operating expenses, net of corporate income Indirect Operating Expenses Net Of Corporate Income The aggregate amount of indirect operating expenses, net of corporate income. PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured notes Secured Debt [Member] Property taxes Property Taxes Real Estate Tax Expense Avalon White Plains Avalon White Plains [Member] Avalon White Plains Total expenses Total Expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Fixed interest rate Stated interest rate of unsecured notes (as a percent) Debt Instrument, Interest Rate, Stated Percentage Total stockholders' equity Equity, Attributable to Parent Historical volatility (as a percent) Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Historical Volatility Rate The historical volatility rate used in valuation technique of calculation of fair value of awards. Share exchange ratio Business Combination Exchange Ratio Business Combination Exchange Ratio ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Notes Payable Maturities 2033 Notes Payable Maturities 2033 [Member] Notes Payable Maturities 2033 Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred Operating lease obligation Operating Lease, Liability Notes Payable 2.300 Maturities 2030 Notes Payable 2.300 Maturities 2030 [Member] Notes Payable 2.300 Maturities 2030 Insider Trading Policies and Procedures [Line Items] Options Outstanding at beginning of period (in shares) Options Outstanding at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Finance lease obligation Finance Lease, Liability Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Performance Shares Performance Shares [Member] Summary of availability on the credit facility Schedule of Line of Credit Facilities [Table Text Block] Unconsolidated real estate entities Unconsolidated Real Estate Entities [Member] Represents information pertaining to real estate entities that are not consolidated within the entity's financial statements. Business Combination [Domain] Business Combination [Domain] Number of communities acquired Number Of Communities Acquired Number Of Communities Acquired Notes Payable Maturities 2028 Notes Payable Maturities 2028 [Member] Notes Payable Maturities 2028 [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Rental and other income Operating Lease, Lease Income Construction in progress, including land Construction in Progress, Gross Antidilutive securities excluded from the computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Central Index Key Entity Central Index Key Notes Payable Maturities 2029 Notes Payable Maturities 2029 [Member] Notes Payable Maturities 2029 [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Non-allocated Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Name of Property [Domain] Name of Property [Domain] Number of SIP commitments Other Commitments, Number of SIP Commitments Other Commitments, Number of SIP Commitments Business Combination [Axis] Business Combination [Axis] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Number of limited partnership units issued Number Of Limited Partnership Units Issued Number Of Limited Partnership Units Issued Number of unconsolidated real estate entities Equity Method Investment, Number Of Unconsolidated Real Estate Entities Represents the number of unconsolidated real estate entities in which the entity had investments as of the balance sheet date. Note receivable lending Payments to Acquire Notes Receivable Number of operating apartment communities owned Number Of Operating Apartment Communities Owned Number of operating apartment communities owned (or in which a direct or indirect ownership interest is held). Pledging Purpose [Domain] Pledging Purpose [Domain] Income Statement [Abstract] Income Statement [Abstract] Common shares issued under Employee Stock Purchase Plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Pledging Purpose [Axis] Pledging Purpose [Axis] Document Transition Report Document Transition Report Change in awards based on performance (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Increase (Decrease) In Awards Based On Performance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Increase (Decrease) in Awards Based on Performance Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Loan guarantee, payment reimbursement by partner, percentage Long-Term Loan Guarantee, Payment Reimbursement By Partner, Percentage Long-Term Loan Guarantee, Payment Reimbursement By Partner, Percentage Note receivable repayments Proceeds from Collection of Notes Receivable Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Summary of valuation options Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Increase in payables for construction Proceeds from (Payments to) Construction Payables Proceeds from (Payments to) Construction Payables Buildings and improvements Investment Building and Building Improvements Debt instrument, basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Other Commitments [Domain] Other Commitments [Domain] City Area Code City Area Code Marketing Marketing Expense Restricted stock Restricted Stock [Member] Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Office Operations Segment Reporting, Office Operations Segment Reporting, Office Operations Name Forgone Recovery, Individual Name Notes Payable 2.050 Maturities 2032 Notes Payable 2.050 Maturities 2032 [Member] Notes Payable 2.050 Maturities 2032 Weighted average period for recognition of unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Stock Option and Incentive Plan 2009 and 2026 Stock Option and Incentive Plan 2009 and 2026 [Member] Stock Option and Incentive Plan 2009 and 2026 Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted average grant date fair value per award Weighted average grant date fair value per share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Notes Payable Maturities 2035 Notes Payable Maturities 2035 [Member] Notes Payable Maturities 2035 Statement Statement [Line Items] Total assets Assets Entity [Domain] Entity [Domain] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Operating Segments Operating Segments [Member] Stock-Based Compensation Plans Share-Based Payment Arrangement [Text Block] Common stock sold under CEP V (in shares) Stock Issued During Period, Shares, New Issues PEO PEO [Member] Converted to shares of common stock (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Converted To Restricted Stock, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted to Restricted Stock, Weighted Average Grant Date Fair Value Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Amount of deferred compensation Deferred Compensation Arrangement with Individual, Recorded Liability Property Technology Investments Property Technology Investments [Member] Property Technology Investments Number of development rights, no longer probable Number Of Development Rights, No Longer Probable Number Of Development Rights, No Longer Probable Expired (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Casualty and impairment loss Casualty Gain And Impairment Loss, Net, Operating Activities Casualty Gain And Impairment Loss, Net, Operating Activities Stock-based compensation expense Compensation expense Share-Based Payment Arrangement, Expense Measurement Basis [Axis] Measurement Basis [Axis] Non-Apartment Components Of Mixed-Use Communities And Other Nonresidential Operations Non-Apartment Components Of Mixed-Use Communities And Other Nonresidential Operations [Member] Non-Apartment Components Of Mixed-Use Communities And Other Nonresidential Operations Notes Payable Maturities 2027 Notes Payable Maturities 2027 [Member] Notes Payable Maturities 2027 [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Common stock issued in connection with stock options exercised (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Grant date fair value per share (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] AVA Arts District AVA Arts District [Member] AVA Arts District [Member] Unrealized gain (loss) on equity securities Equity Securities, FV-NI, Gain (Loss) Subsequent Event Type [Domain] Subsequent Event Type [Domain] Accumulated earnings less dividends Retained Earnings [Member] Operating Expenses Operating Expenses Fair value adjustment related to equity Equity, Fair Value Adjustment Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Notes Payable 2.900 Maturities 2026 Notes Payable 2.900 Maturities 2026 [Member] Notes Payable 2.900 Maturities 2026 [Member] Apartment homes acquired Number Of Apartment Homes Acquired Number Of Apartment Homes Acquired Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Stock Option and Incentive Plan 2026 Stock Option and Incentive Plan 2026 [Member] Stock Option and Incentive Plan 2026 Net income attributable to common stockholders (in dollars per share) Earnings per common share - diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Maximum value of shares of common stock that can be sold Common Stock Value, Authorized Under Continuous Equity Program The maximum value of common stock which the entity is authorized to issue under the program. Net cash (used in) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Estimated volatility over the life of the plan, maximum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Total Shareholder Return Amount Total Shareholder Return Amount Shares withheld to satisfy employees' tax withholding and other liabilities Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Increase in prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Cash Flow Hedging Cash Flow Hedging [Member] Capitalized interest during the development and redevelopment of real estate assets Interest Costs Capitalized AvalonBay to Equity Residential AvalonBay to Equity Residential [Member] AvalonBay to Equity Residential Payments to acquire real estate Payments to Acquire Real Estate Commercial square feet Commercial Square Feet Commercial Square Feet Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Ownership [Domain] Ownership [Domain] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Equity Residential Merger Equity Residential Merger [Member] Equity Residential Merger Estimated construction contract cost Estimated Construction Contract Cost Estimated Construction Contract Cost Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Management, development and other fees Revenue from Contract with Customer, Excluding Assessed Tax Rental income from real estate assets sold or held for sale Revenue From Assets Held For Sale, Not Classified As Discontinued Operations Revenue From Assets Held for Sale, Not Classified as Discontinued Operations Total Credit Facility available Line of Credit Facility, Remaining Borrowing Capacity Real estate assets held for sale, net Disposal Group, Including Discontinued Operation, Assets, Current Fixed rate unsecured notes Fixed Rate Unsecured Notes [Member] Fixed Rate Unsecured Notes Derivative assets Derivative Asset Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Estimate of Fair Value Measurement Estimate of Fair Value Measurement [Member] Issuance of common stock, net of withholdings Stock Issued During Period, Value, New Issues Lessor Considerations Lessor, Leases [Policy Text Block] Weighted average interest rate Derivative Weighted Average Interest Rate Reflects the calculation as of the balance sheet date of the average interest rate weighted by interest rate caps and interest rate swaps at that time. Weighted average exercise price of options forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Risk-free rate, minimum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Net income attributable to common stockholders - basic Undistributed Earnings, Basic Net operating real estate Operating Real Estate Investment Property, Net Operating Real Estate Investment Property, Net Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Segment Reporting [Table] Segment Reporting [Table] Total Revenue Revenue Excluding Management, Development And Other Fees And Other Ancillary Items Revenue, Excluding Revenue From Contract With Customer Scheduled payments and maturities of mortgage notes payable and unsecured notes outstanding Schedule of Maturities of Long-Term Debt [Table Text Block] Outstanding receivables associated with property and construction management Contract with Customer, Receivable, after Allowance for Credit Loss Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Sale of Stock [Axis] Sale of Stock [Axis] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Net operating income Total NOI Operating Income (Loss) Structured Investment Program Structured Investment Program [Member] Structured Investment Program Current Fiscal Year End Date Current Fiscal Year End Date Payables for construction Construction Payable Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative instruments and Hedging Activities Derivative [Line Items] Notes Payable 3.200 Maturities 2028 Notes Payable 3.200 Maturities 2028 [Member] Notes Payable 3.200 Maturities 2028 Related Party Transaction [Domain] Related Party Transaction [Domain] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends declared to common stockholders (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Schedule of nonvested performance awards granted Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Dividends declared to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Lease liabilities Lease, Liability Lease, Liability Schedule of stock options Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted average exercise price per option Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Forward Contracts Forward Contracts [Member] Assets Held under Finance Leases Assets Held under Finance Leases [Member] Assets Held under Finance Leases [Member] DownREIT Partnership DownREIT Partnership [Member] DownREIT Partnership Dividends declared to noncontrolling interest (in dollars per share) Noncontrolling Interest, Dividends, Per Share, Declared Noncontrolling Interest, Dividends, Per Share, Declared Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Apartment homes Number Of Apartment Homes Sold Number Of Apartment Homes Sold Class of Stock [Line Items] Class of Stock [Line Items] Notes Payable 2.950 Maturities 2026 Notes Payable 2.950 Maturities 2026 [Member] Notes Payable 2.950 Maturities 2026 [Member] 2026 Stock Repurchase Program 2026 Stock Repurchase Program [Member] 2026 Stock Repurchase Program Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] (Loss) gain on sale of communities Loss (gain) on sale of communities, net Gains (Losses) on Sales of Investment Real Estate Acquisition of real estate assets, including partnership interest Payments to acquire other real estate Payments to Acquire Other Real Estate Entity Small Business Entity Small Business Comprehensive income attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares) Number of shares of stock grants withheld (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Subsequent Events [Abstract] Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Gross sales price Proceeds from Sale of Real Estate Real Estate Disposition Activities Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Notes Payable Maturities 2030 Notes Payable Maturities 2030 [Member] Notes Payable Maturities 2030 [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Insurance Segment Reporting, Insurance Segment Reporting, Insurance Document Type Document Type Financial Instruments Measured/Discussed at Fair Value Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Variable rate notes Long-Term Debt, Percentage Bearing Variable Interest, Amount Fair value of shares issued Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Issued In Period Fair Value Represents the fair value of share-based awards other than options issued during the period. Operating Activities [Axis] Operating Activities [Axis] Legacy Equity Residential Shareholders Legacy Equity Residential Shareholders [Member] Legacy Equity Residential Shareholders Gross weighted average price (in dollars per share) Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Organization, Basis of Presentation and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Pledged Status [Domain] Pledged Status [Domain] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies Commitments and Contingencies Total revenue Revenues Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Furniture, fixtures and equipment Fixtures and Equipment, Gross Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Noncontrolling Interests Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Noncontrolling interests, joint venture and preferred equity transactions Payments For Redemption Of Noncontrolling Interests, Distribution To Joint Ventures And Preferred Equity Redemption And Dividends Payments For Redemption Of Noncontrolling Interests, Distribution To Joint Ventures And Preferred Equity Redemption And Dividends Executive Category: Executive Category [Axis] Casualty and impairment loss Impairment of Real Estate Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Schedule of summary of classification between the three levels of the fair value hierarchy of the Company's financial instruments measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Gain on disposition Gains (Losses) On Sales Of Investment Real Estate, Excluding Post Disposition Costs Gains (Losses) On Sales Of Investment Real Estate, Excluding Post Disposition Costs Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Fair Value Disclosures [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Asset Pledged as Collateral Asset Pledged as Collateral [Member] Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information [Abstract] Cash flow hedge gains reclassified to earnings Cash flow hedge gains reclassified to earnings Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Repurchases of shares (in shares) Treasury Stock, Shares, Acquired Weighted average grant date value (in dollars per share) Share Price PEO Name PEO Name Geographical [Axis] Geographical [Axis] Decrease in accrued expenses, other liabilities, accrued interest payable and resident security deposits Increase (Decrease) in Accrued Liabilities Number of office leases Number Of Office Leases Number of Office Leases Number of owned communities under construction Number Of Owned Communities Under Construction Number of owned communities (or where a direct or indirect interest is owned) that are under construction. Variable Rate Unsecured Term Loan $550 Million Variable Rate Unsecured Term Loan $550 Million [Member] Variable Rate Unsecured Term Loan $550 Million Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Avalon Sunset Towers Avalon Sunset Towers [Member] Avalon Sunset Towers Entity Tax Identification Number Entity Tax Identification Number Fixed rate notes Long-Term Debt, Percentage Bearing Fixed Interest, Amount Legal Entity [Axis] Legal Entity [Axis] Gain (loss) on cash flow hedges Gain (loss) on cash flow hedges, net Gain (loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Prepaid expenses and other assets Prepaid Expense and Other Assets Notes Payable Notes Payable Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Treasury stock value Treasury Stock, Value, Acquired, Cost Method Line of credit facility, commitment fee percentage, increase (decrease) Line of Credit Facility, Commitment Fee Percentage, Increase (Decrease) Line of Credit Facility, Commitment Fee Percentage, Increase (Decrease) Product Concentration Risk Product Concentration Risk [Member] Assets Held under Operating Leases Assets Held under Operating Leases [Member] Assets Held under Operating Leases [Member] Weighted average exercise price of options exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Cash, cash equivalents and restricted cash reported in the Condensed Consolidated Statements of Cash Flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Notes Payable 5.350 Maturities 2034 Notes Payable 5.350 Maturities 2034 [Member] Notes Payable 5.350 Maturities 2034 Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Ownership percentage Equity Method Investment, Ownership Percentage Amortization of stock-based compensation Share-Based Payment Arrangement, Noncash Expense New England region New England region [Member] New England region Disposal Group Name [Axis] Disposal Group Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Commitments and Contingencies Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Net income attributable to common stockholders (in dollars per share) Earnings per common share - basic (in dollars per share) Earnings Per Share, Basic 2025 and 2026 Stock Repurchase Program 2025 and 2026 Stock Repurchase Program [Member] 2025 and 2026 Stock Repurchase Program Repurchase of common stock, net Payments for Repurchase of Common Stock Forward contract indexed to issuer's equity price per share (in dollars per share) Forward Contract Indexed to Equity, Settlement, Share, Fair Value Per Share Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Notes Payable 1.900 Maturities 2028 Notes Payable 1.900 Maturities 2028 [Member] Notes Payable 1.900 Maturities 2028 Development/redevelopment of real estate assets including land acquisitions and deferred development costs Payments to Develop Real Estate Assets Award Type [Axis] Award Type [Axis] Payment of deferred financing costs Payments of Financing Costs Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Number of commercial properties owned Number Of Commercial Properties Owned Number of commercial properties owned. Accumulated earnings less dividends Retained Earnings (Accumulated Deficit) Operating expenses from real estate assets sold or held for sale Operating Expenses From Assets Held For Sale, Not Classified As Discontinued Operations Operating Expenses From Assets Held for Sale, Not Classified as Discontinued Operations Product and Service [Axis] Product and Service [Axis] Same Store Same Store Same Store [Member] Represents information pertaining to the Same Store segment of the entity. Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Acquisitions of Investments in Real Estate Real Estate, Policy [Policy Text Block] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Long-term construction loan, maximum borrowing capacity, guarantee, percentage Long-Term Loan, Maximum Borrowing Capacity, Guarantee, Percentage Long-Term Loan, Maximum Borrowing Capacity, Guarantee, Percentage Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Continuous Equity Program CEP V Continuous Equity Program CEP V [Member] Continuous Equity Program CEP V [Member] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Derivative Contract [Domain] Derivative Contract [Domain] Concentration risk (as a percent) Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Net operating income from real estate assets sold or held for sale Net operating income from real estate assets sold or held for sale Disposal Group, Not Discontinued Operation, Net Operating Income From Assets Held For Sale, Not Classified As Discontinued Operations Disposal Group, Not Discontinued Operation, Net Operating Income From Assets Held For Sale, Not Classified As Discontinued Operations Equity Awards Adjustments Equity Awards Adjustments [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Merger termination fee maximum exposure Business Combination, Merger Termination Fee Maximum Exposure Business Combination, Merger Termination Fee Maximum Exposure Resident security deposits Security Deposit Liability Total liabilities and equity Liabilities and Equity Interest income, other Interest Income, Other Employee Stock Option Share-Based Payment Arrangement, Option [Member] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Notes Payable, Other Payables Notes Payable, Other Payables [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Plan Name [Axis] Plan Name [Axis] Notes Payable Maturities Thereafter Notes Payable Maturities Thereafter [Member] Represents notes payable which mature after the last year presented. Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Expensed transaction, development and other pursuit costs, net of recoveries Expensed transaction, development and other pursuit costs, net of recoveries Other Nonoperating Income (Expense) Total stockholders' equity Parent [Member] Other Stabilized Other Stabilized Other Stabilized Communities [Member] Represents information pertaining to the Other Stabilized Communities segment of the entity. Name Awards Close in Time to MNPI Disclosures, Individual Name Real Estate Properties [Line Items] Real Estate Properties [Line Items] Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative expense General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, $0.01 par value; $25 liquidation preference; 50,000,000 shares authorized at June 30, 2026 and December 31, 2025; zero shares issued and outstanding at June 30, 2026 and December 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Number of operating apartment communities Number of apartment communities Number of Real Estate Properties Real estate: Real Estate Investment Property, Net [Abstract] Hedging Designation [Domain] Hedging Designation [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Schedule of net operating income from real estate assets sold or held for sale, not classified as discontinued operations Schedule Of Net Operating Income From Real Estate Assets Sold Or Held For Sale, Not Classified As Discontinued Operations [Table Text Block] Schedule of Net Operating Income from Real Estate Assets Sold or Held for Sale, Not Classified as Discontinued Operations [Table Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid during the period for interest, net of amount capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Emergency Response Emergency Response and Pipe Burst Impairment [Member] Emergency Response and Pipe Burst Impairment Hedging Designation [Axis] Hedging Designation [Axis] Other commitment Other Commitment Net income allocated to unvested restricted shares Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Mortgage Notes Payable, Unsecured Notes, and Term Loans Mortgage Notes Payable, Unsecured Notes, And Term Loans [Member] Mortgage Notes Payable, Unsecured Notes, And Term Loans Development / Redevelopment Development Redevelopment [Member] Represents information pertaining to the Development/Redevelopment Communities segment of the entity. Equity Residential to AvalonBay Equity Residential to AvalonBay [Member] Equity Residential to AvalonBay Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total Assets Assets, Fair Value Disclosure Notes Payable 2.450 Maturities 2031 Notes Payable 2.450 Maturities 2031 [Member] Notes Payable 2.450 Maturities 2031 Payroll Cost, Direct Labor Notes Payable 4.3500 Maturities 2048 Notes Payable 4.350 Maturities 2048 [Member] Notes Payable 4.350 Maturities 2048 Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Same Store Operating Expense Same Store Operating Expense [Member] Same Store Operating Expense Notes Payable, Unsecured Notes and Credit Facility Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Number of development rights owned Number Of Development Rights Owned Number Of Development Rights Owned Accrued expenses and other liabilities Accrued Liabilities Distributions from unconsolidated entities and investment sale proceeds Distributions From Equity Method Investees Distributions From Equity Method Investees Name Trading Arrangement, Individual Name Summary of Real Estate Sales Schedule of Disposal Groups Including Discontinued Operations Summary of Real Estate Dispositions [Table Text Block] Schedule of Disposal Groups Including Discontinued Operations Summary of Real Estate Dispositions Deferred development costs Other Deferred Costs, Net Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Total shareholder return metrics (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Total Shareholder Metrics Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Total Shareholder Metrics Notes Payable 5.000 Maturities 2035 Notes Payable 5.000 Maturities 2035 [Member] Notes Payable 5.000 Maturities 2035 Variable rate unsecured credit facility and commercial paper, net Long-term Line Of Credit And Commercial Paper Long-term Line Of Credit And Commercial Paper Operating lease expense Operating Lease, Expense Communities under development rights Additional, Number Of Communities Expected To Be Developed Additional number of communities owned (or in which a direct or indirect ownership interest is held) that can be expected to be developed. Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Schedule of reconciliation of NOI to net income Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Non-designated Hedges Not Designated as Hedging Instrument [Member] Forward contract shares (in shares) Forward Contract Indexed to Issuer's Equity, Indexed Shares Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Capital expenditures - non-real estate assets Payments For Capital Improvements, Non Real Estate Payments For Capital Improvements, Non Real Estate Weighted average rate of return on other commitments Other Commitments, Weighted Average Rate Of Return Other Commitments, Weighted Average Rate Of Return Land held for development Land Available for Development Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Estimated number of apartment homes in communities to be developed Estimated Number Of Apartment Homes In Communities Expected To Be Developed Estimated number of apartment homes in communities awaiting development. Interest Rate Caps Interest Rate Cap [Member] Proceeds from sale of real estate, net of selling costs Proceeds from Sale, Real Estate, Held-for-Investment Derivative liability Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Post merger onership percent Business Combination, Post Merger Ownership Percent Business Combination, Post Merger Ownership Percent Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax (expense) benefit Income tax expense (benefit) Income Tax Expense (Benefit) Development/ Redevelopment Development/Redevelopment Communities [Member] Development/Redevelopment Communities [Member] Award Timing Method Award Timing Method [Text Block] Net (decrease) increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Cash flow hedge gains reclassified to earnings Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Abandoned pursuit costs Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs Issuance of unsecured debt Proceeds from Unsecured Notes Payable Estimated volatility over the life of the plan, minimum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Net income attributable to common stockholders Net income attributable to common stockholders Net Income (Loss) Attributable to Parent Proceeds from repayment Other Commitments, Proceeds from Repayment Other Commitments, Proceeds from Repayment Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Land Held for Future Development Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Catastrophic Event [Axis] Catastrophic Event [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Notes Payable 3.300 Maturities 2029 Notes Payable 3.300 Maturities 2029 [Member] Notes Payable 3.300 Maturities 2029 Proceeds from notes payable Proceeds from Notes Payable Weighted average exercise price of options exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Lessee Considerations Lessee, Leases [Policy Text Block] Structured Investment Program interest income Structured Investment Program interest income Income (Loss) From Structured Investment Program Interest Income (Loss) From Structured Investment Program Interest Notes Payable 5.000 Maturities 2033 Notes Payable 5.000 Maturities 2033 [Member] Notes Payable 5.000 Maturities 2033 Revenue: Revenues [Abstract] Weighted average capped/swapped interest rate Derivative, Average Cap Interest Rate Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Net income attributable to DownREIT unitholders in consolidated partnerships Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities