Dividends to common stockholders, per share (in usd per share) Common Stock, Dividends, Per Share, Cash Paid Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Third-party capital management expenses Cost of Other Property Operating Expense Non-mortgage loans receivable, fair value Non-mortgage Loans Receivable, Fair Value Non-mortgage Loans Receivable, Fair Value Statistical Measurement [Domain] Statistical Measurement [Domain] Fixed Rate Debt Member Fixed Rate Debt [Member] Fixed Rate Debt Award Timing Predetermined Award Timing Predetermined [Flag] Real Estate [Domain] Real Estate [Domain] Entity File Number Entity File Number Pension Fund Joint Venture Pension Fund Joint Venture [Member] Pension Fund Joint Venture Payment of deferred financing costs Payments of Financing Costs Tabular List, Table Tabular List [Table Text Block] Basic: Earnings per common share Earnings Per Share, Basic [Abstract] Straight-line rent receivables Straight-Line Rent Receivables, Net Straight-Line Rent Receivables, Net Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Redeemable OP Units, fair value Redeemable Noncontrolling Interest, Equity, Other, Fair Value Deferred lease costs, net Deferred Costs, Leasing, Net Carrying Amounts and Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Proceeds from loans receivable Proceeds from Sale and Collection of Loans Receivable Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Net income attributable to common stockholders (in usd per share) Net income (loss) attributable to common stockholders, basic (in usd per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Intersegment sales and transfers Intersegment Sales And Transfers Intersegment Sales And Transfers 2.45% Senior Notes, Series G Due 2027 2.45% Senior Notes, Series G Due 2027 [Member] 2.45% Senior Notes, Series G Due 2027 Decrease in accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Total other comprehensive income Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Summary information by reportable business segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Assets held for sale Disposal Group, Including Discontinued Operation, Assets Adjustment to Compensation, Amount Adjustment to Compensation Amount Percentage of Total NOI Concentration Risk, Percentage Resident fees and services Resident Fees and Services [Member] Resident Fees and Services [Member] Debt instrument, unamortized discount (premium) and debt issuance costs, net Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Decrease in other assets Increase (Decrease) in Other Operating Assets Class of Warrant or Right, Ownership Percentage, Parent Class of Warrant or Right, Ownership Percentage, Parent Class of Warrant or Right, Ownership Percentage, Parent Principles of Consolidation Consolidation, Policy [Policy Text Block] Equity offering program, shares, remaining authorized offering amount Equity Offering Program, Shares, Remaining Authorized Offering Amount Equity Offering Program, Shares, Remaining Authorized Offering Amount 5.00% Senior Notes due 2035 5.00% Senior Notes due 2035 [Member] 5.00% Senior Notes due 2035 Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Variable Interest Entity Variable Interest Entity, Primary Beneficiary [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Atria Atria [Member] Represents the information pertaining to Atria. Investment in unconsolidated entities Payments to Acquire Equity Method Investments Dividends to common stockholders Dividends, Common Stock, Cash Total Ventas stockholders’ equity Equity, Attributable to Parent Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Goodwill and Intangible Assets Disclosure [Abstract] Development project expenditures Payments to Develop Real Estate Assets Equity offering program, remaining authorized offering amount Equity Offering Program, Remaining Authorized Offering Amount Equity Offering Program, Remaining Authorized Offering Amount Pension Fund Joint Venture VTRAZ JV [Member] VTRAZ JV Total liabilities and equity Liabilities and Equity LOANS RECEIVABLE AND INVESTMENTS, NET Loans Receivable And Investments [Text Block] Loans Receivable And Investments [Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Liabilities and equity Liabilities and Equity [Abstract] Credit Agreement Credit Agreement [Member] Credit Agreement Cover [Abstract] Cash and cash equivalents, fair value Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] DISPOSITIONS AND IMPAIRMENTS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Secured loans receivable and investments, net Secured Notes and Loans Receivable, Net For an unclassified balance sheet, a secured amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. Real estate investments: Real Estate Investment Property, Net [Abstract] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Accounting Policies [Abstract] Accounting Policies [Abstract] ACQUISITIONS OF REAL ESTATE PROPERTY Asset Acquisition [Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt instruments Debt Instrument [Line Items] Non-mortgage loans receivable, net Non-Mortgage Loan Receivable [Member] Non-Mortgage Loan Receivable [Member] CONCENTRATION OF CREDIT RISK Concentration Risk Disclosure [Text Block] Treasury Stock Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Senior notes payable and other debt Debt, Long-Term and Short-Term, Combined Amount Operating lease liabilities Operating Lease, Liability 5.63% Senior Notes due 2034 5.63% Senior Notes due 2034 [Member] 5.63% Senior Notes due 2034 Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Liabilities: Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Principal amount exchanged Debt Instrument, Aggregate Principal Exchanged Debt Instrument, Aggregate Principal Exchanged 4.00% Senior Notes due 2028 4.00% Senior Notes due 2028 [Member] 4.00% Senior Notes due 2028 [Member] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Income before unconsolidated entities, real estate dispositions, income taxes and noncontrolling interests Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Proceeds from debt Proceeds from Issuance of Debt Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Number of real estate properties acquired Number of real estate properties acquired Number of Real Estate Properties Acquired Number of Real Estate Properties Acquired Operating Segments Operating Segments [Member] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Other intangibles, net Other Intangible Assets, Net Condensed Consolidating Statement of Cash Flows Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Comprehensive income attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Purchase option intangibles Indefinite-Lived Intangible Liabilities, Purchase Options Indefinite-Lived Intangible Liabilities, Purchase Options Letter of Credit Letter of Credit [Member] Distributions to noncontrolling interests Payments to Noncontrolling Interests Escrow deposits and restricted cash Escrow Deposits And Restricted Cash Escrow Deposits And Restricted Cash Management fees Management Fee Expense Deferred income tax liabilities Deferred tax liabilities Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Net intangible assets Intangible Assets, Net (Including Goodwill) Unsecured revolving credit facility Unsecured debt Unsecured Debt [Member] Award Timing Method Award Timing Method [Text Block] Net income from continuing (in usd per share) Income from continuing operations, basic (in usd per share) Income (Loss) from Continuing Operations, Per Basic Share Commercial paper program capacity Commercial Paper Program Capacity Commercial Paper Program Capacity Award Type Award Type [Axis] Legal Entity [Axis] Legal Entity [Axis] Total assets Total Assets Assets Investment, Name [Domain] Investment, Name [Domain] Adjustments to Equity, Redemption of Limited Partnership Units Adjustments to Equity, Redemption of Limited Partnership Units This element represents Adjustments to Equity for Redemption of Limited Partnership Units. Trading Symbol Trading Symbol Other identified VIEs Other Identified VIEs [Member] Other Identified VIEs [Member] Income tax benefit Other Tax Expense (Benefit) Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Receivable Type [Axis] Receivable Type [Axis] Other segment expenses Segment Reporting, Other Segment Item, Amount Intangible assets acquired, useful life (in years) Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Effect of foreign currency translation Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Variable Interest Entity Variable Interest Entity [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding 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] Deferred financing costs, net Debt Issuance Costs, Net OM&R Outpatient Medical And Research Portfolio [Member] Outpatient Medical And Research Portfolio Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] OP Unitholder Interests (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Depreciation and amortization Depreciation and amortization [Member] Depreciation and amortization [Member] Equity method investment, total voting power Equity Method Investment, Voting Rights, Percentage Equity Method Investment, Voting Rights, Percentage PEO PEO [Member] Total loans receivable and investments, net, amortized cost Secured mortgage loans and other, net Secured Loans, Unsecured Loans, And Other Available-For-Sale Securities, Amortized Cost Secured Loans, Unsecured Loans, And Other Available-For-Sale Securities, Amortized Cost Derivative, loss Derivative, Loss on Derivative 4.375% Senior Notes due 2045 4.375% Senior Notes due 2045 [Member] 4.375% Senior Notes due 2045 Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Total loans receivable and investments, net, fair value Secured mortgage loans and other, net, fair value Secured Loans, Unsecured Loans, And Other Available-For-Sale Securities, Fair Value Secured Loans, Unsecured Loans, And Other Available-For-Sale Securities, Fair Value 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] Retained Earnings (Deficit) Retained Earnings [Member] Accounts payable and other liabilities Accounts Payable and Accrued Liabilities Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations Maturities of Long-Term Debt [Abstract] Debt instrument, interest rate, effective percentage Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative instruments Derivative Asset Income tax benefit Income tax expense (benefit) Income Tax Expense (Benefit) Investment in loans receivable Payments to Acquire Loans Receivable Variable interest rate Debt Instrument, Basis Spread on Variable Rate Other assets Total Other assets Other Assets Issuance of common stock for stock plans, restricted stock grants and other Stock Issued During Period, Value, Share-based Payment Arrangements, Restricted Stock Awards And Other, After Forfeiture Stock Issued During Period, Value, Share-based Payment Arrangements, Restricted Stock Awards And Other, After Forfeiture Decrease in accrued interest payable Increase (Decrease) in Interest Payable, Net Unsecured term loan Unsecured debt Unsecured Debt Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Senior housing operating portfolio (SHOP) Seniors Housing Communities Managed by Independent Operators [Member] Seniors Housing Communities Managed by Independent Operators [Member] Above-market lease intangibles Above Market Leases [Member] Product and Service [Domain] Product and Service [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Unrealized gain (loss) on derivative instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Land and improvements Land and Land Improvements Net income from continuing (in usd per share) Income from continuing operations, diluted (in usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Total Ventas Stockholders’ Equity Parent [Member] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Unrealized loss on available for sale securities AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Derivative notional amount Derivative, Notional Amount Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Capital expenditures Payments to Acquire Other Productive Assets Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] 3.00% Senior Notes due 2030 3.00% Senior Notes due 2030 [Member] 3.00% Senior Notes due 2030 [Member] Proceeds from stock option exercises Proceeds from Stock Options Exercised City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Labor Cost, Direct Labor Unamortized fair value adjustment Debt Instrument, Unamortized Fair Value Adjustment Represents the unamortized fair value adjustment of the debt instrument. All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Mortgage loans and other Mortgage loans Mortgages [Member] 2.50% Senior Notes due 2031 2.50% Senior Notes due 2031 [Member] 2.50% Senior Notes due 2031 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] 3.25% Senior Notes due 2026 3.25% Senior Notes due 2026 [Member] 3.25% Senior Notes due 2026 [Member] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General, administrative and professional fees General, administrative and professional fees General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Insurance proceeds for property damage claims Proceeds from Insurance Settlement, Investing Activities Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Equity method investments Schedule of Equity Method Investments [Line Items] Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Forward Starting Swap Swap Two [Member] Swap Two Adjust redeemable OP unitholder interests to current fair value Adjustments To Additional Paid In Capital Related To Redeemable Operating Partner Unitholder Interests To Record At Fair Value Adjustments to additional paid in capital related to the Redeemable Operating Partner unitholder interests in order to record at fair value. Forward Starting Swap Swap [Member] Numerator for basic and diluted earnings per share: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Equity Components [Axis] Equity Components [Axis] Real estate properties Real Estate Properties [Line Items] DESCRIPTION OF BUSINESS Nature of Operations [Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Concentration Risk [Table] Concentration Risk [Table] Number of reportable segments Number of Reportable Segments Number of Reportable Segments Unamortized discounts Debt Instrument, Unamortized Discount (Premium), Net Interest and other income Interest and Other Income Other Performance Measure, Amount Other Performance Measure, Amount Foreign currency translation (loss) gain Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Entity Address, State or Province Entity Address, State or Province Number of board members appointed Number Of Board Members Appointed Number Of Board Members Appointed Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Cash distributions to common stockholders Payments of Ordinary Dividends, Common Stock Capital in excess of par value Additional Paid in Capital, Common Stock Entity [Domain] Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation 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] Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Document Fiscal Year Focus Document Fiscal Year Focus Basis of Accounting Basis of Accounting, Policy [Policy Text Block] Operating lease assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] All other Other Equity Method Investments [Member] Other Equity Method Investments NOI Net Operating Income The net result for the period of deducting interest and other income, property-level operating expenses, and office building services costs from total revenues. Entity Interactive Data Current Entity Interactive Data Current Below market leases, remaining weighted average amortization period (in years) Finite-Lived Intangible Liabilities, Below Market Leases, Remaining Weighted Average Amortization Period Finite-Lived Intangible Liabilities, Below Market Leases, Remaining Weighted Average Amortization Period Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Carrying Amount Reported Value Measurement [Member] Intangible assets: Intangible Assets, Net (Including Goodwill) [Abstract] Transaction, transition and restructuring costs Transaction, transition and restructuring costs Business Combination, Acquisition-Related Cost, Expense Ventas Investment Management platform Ventas Investment Management Platform (VIM) [Member] Through Ventas Investment Management Platform (VIM) we partner with third-party institutional investors to invest in healthcare real estate through various joint ventures and other co-investment vehicles. COMMITMENTS AND CONTINGENCIES Legal Matters and Contingencies [Text Block] NNN Triple Net Leased Properties [Member] Represents the Triple-Net Leased Properties, a segment of the entity. Senior Housing Community Senior Housing Community [Member] Senior Housing Community NHP/PMB L.P. NHPPMBLP [Member] Represents the entity NHP/PMB L.P. Equity [Abstract] Equity [Abstract] Senior notes Senior Notes Gain on real estate dispositions Gain on real estate dispositions Gain on real estate dispositions Gain (Loss) on Disposition of Real Estate Gain (Loss) on Disposition of Real Estate Other liabilities Noncash or Part Noncash Acquisition, Other Liabilities Noncash or Part Noncash Acquisition, Other Liabilities SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Weighted Average Remaining Amortization Period in Years Finite-Lived Intangible Assets, Remaining Amortization Period Equity offering [Line Items] Equity offering [Line Items] [Line Items] for Equity offering [Table] Class of Warrant or Right [Table] Class of Warrant or Right [Table] Increase (decrease) in stockholders' equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets Finite-Lived Intangible Assets [Line Items] Ownership [Domain] Ownership [Domain] Equity offering program, proceeds Equity Offering Program, Consideration Received Equity Offering Program, Consideration Received Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Gain on real estate loan investments Gains (Losses) On Real Estate Loan Investments Gains (Losses) On Real Estate Loan Investments Other (2) Other Assets, Miscellaneous Commercial paper notes Commercial Paper Deferred income tax assets, net Deferred tax assets Deferred Income Tax Assets, Net Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Foreign currency translation loss Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Scheduled Maturities of Borrowing Arrangements and Other Provisions Excluding Capital Lease Obligations Schedule of Maturities of Long-Term Debt [Table Text Block] Total revenues Revenues Revenues 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Exchangeable Notes (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Ventas Fund The Fund [Member] the Fund [Member] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Third-party capital management expenses Third Party Capital Management [Member] Third Party Capital Management Fixed income from operating leases Operating Lease, Fixed Lease Income Operating Lease, Fixed Lease Income Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Thereafter Long-Term Debt, Maturity, after Year Five Subsequent Event Type [Axis] Subsequent Event Type [Axis] Number of board members nominated Number Of Board Members Nominated Number Of Board Members Nominated Less: Interest and Other Income Property Operating Expenses Building Service Costs [Abstract] -- None. No documentation exists for this element. -- Assets Assets: Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent 3.30% Senior Notes, Series H Due 2031 3.30% Senior Notes, Series H Due 2031 [Member] 3.30% Senior Notes, Series H Due 2031 Debt Instrument [Axis] Debt Instrument [Axis] Atrium Health And Wake Forest Joint Venture Atrium Health And Wake Forest Joint Venture [Member] Atrium Health And Wake Forest Joint Venture FAIR VALUES OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Loss on extinguishment of debt, net Loss on extinguishment of debt, net Gain (Loss) on Extinguishment of Debt Credit Facility [Domain] Credit Facility [Domain] Ventas stockholders’ equity: Equity, Attributable to Parent [Abstract] Acquired lease intangibles Lease intangible assets Finite-Lived Intangible Assets, Gross Buildings and improvements Investment Building and Building Improvements 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] Unsecured term loan due February 2027 Unsecured Term Loan Due February 2027 [Member] Unsecured Term Loan Due February 2027 Entity Address, Address Line One Entity Address, Address Line One Redeemable OP unitholder and noncontrolling interests Temporary Equity, Including Noncontrolling Interest Entity Address, Address Line Two Entity Address, Address Line Two Unrealized gains (losses) to be reclassified into earnings in the next 12 months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Schedule of Intangibles Intangibles [Table Text Block] Tabular disclosure of the aggregate amount of intangible assets and liabilities. Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Interest rate Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Redeemable OP Units Redeemable Noncontrolling Interest, Equity, Carrying Amount Equity Offering [Domain] Equity Offering [Domain] Equity Offering [Domain] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] 4.40% Senior Notes due 2029 4.400% Senior Notes due 2029 [Member] 4.400% Senior Notes due 2029 [Member] Ownership [Axis] Ownership [Axis] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Liabilities related to assets held for sale Disposal Group, Including Discontinued Operation, Liabilities Net real estate investments Net Real Estate Investments Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land and improvements; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) right of use assets; (8) lease intangibles; (9) other real estate investments; (10) real estate joint ventures; and (11) unconsolidated real estate and other joint ventures not separately presented. Restricted stock awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Equity offering program, maturity, term (in years) Equity Offering Program, Maturity, Term Equity Offering Program, Maturity, Term Total expenses Costs and Expenses Document Quarterly Report Document Quarterly Report Total loans receivable and investments, net, carrying amount Secured Loans, Unsecured Loans, And Other Available-For-Sale Securities Secured Loans, Unsecured Loans, And Other Available-For-Sale Securities Assets acquired and liabilities assumed from acquisitions: Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) [Abstract] Senior notes payable and other debt, gross, fair value Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Equity offering [Table] Equity offering [Table] Equity offering [Table] Deferred income tax liability Noncash or Part Noncash Acquisition, Deferred Income Tax Liabilities Assumed Noncash or Part Noncash Acquisition, Deferred Income Tax Liabilities Assumed Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Net investment in real estate property Payments to Acquire Commercial Real Estate Summary of Senior Notes Payable and Other Debt Schedule of Debt [Table Text Block] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Interest and debt expense Interest and Debt Expense Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Letters of credit outstanding Letters of Credit Outstanding, Amount Repayment of debt Repayments of Other Debt Other Proceeds from (Payment for) Other Financing Activity Kindred Healthcare, LLC (“Kindred”) Kindred [Member] Represents the information pertaining to Kindred Healthcare, Inc. Other intangibles Other Intangible Assets [Member] Management Service Management Service [Member] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Unsecured term loan due January 2031 Unsecured Term Loan Due June 2027 [Member] Unsecured Term Loan Due June 2027 Other Other Noncash Income (Expense) Other assets Noncash or Part Noncash Acquisition, Other Assets Acquired Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Accumulated amortization Indefinite Lived Intangible Liabilities Accumulated Amortization The accumulated amount of amortization of a major finite-lived intangible liabilities class. Compensation Amount Outstanding Recovery Compensation Amount Debt instrument, face amount Debt Instrument, Face Amount 5.398% Senior Notes due 2028 5.398% Senior Notes, Series I due 2028 [Member] 5.398% Senior Notes due 2028 [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Straight-lining of rental income Straight Line Rent Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Intangible liabilities: Intangible Liabilities [Abstract] Intangible Liabilities [Abstract] Name Awards Close in Time to MNPI Disclosures, Individual Name Ownership percentage, threshold (may have less than) Equity Method Investment, Ownership Percentage Threshold Equity Method Investment, Ownership Percentage Threshold Unrealized loss on derivative instruments AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax OTHER ASSETS Other Assets Disclosure [Text Block] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Business Acquisition [Line Items] Asset Acquisition [Line Items] Revenues Revenues [Abstract] Non-mortgage loans receivable, net, carrying amount Non-mortgage loans receivable, net Non-mortgage Loans Receivable, Net Non-mortgage Loans Receivable, Net Accumulated other comprehensive loss Total Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax 4.875% Senior Notes due 2049 4.875% Senior Notes due 2049 [Member] 4.875% Senior Notes due 2049 [Member] Reportable Business Segments And Non-Segment Assets Reportable Business Segments And Non-Segment Assets [Table Text Block] Reportable Business Segments And Non-Segment Assets 2026 Long-Term Debt, Maturity, Year One Financial Instruments [Domain] Financial Instruments [Domain] Segments [Domain] Segments [Domain] 2030 Long-Term Debt, Maturity, Year Five Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Net change in noncontrolling interests Noncontrolling Interest, Period Increase (Decrease), Including Impact To Equity Net increase or decrease in balance of noncontrolling interest in the subsidiary during the reporting period related to items not individually reported. Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Scheduled Periodic Amortization Debt Instrument, Periodic Payment Mortgages [Member] Debt Instrument, Periodic Payment Mortgages [Member] Unconsolidated Properties Unconsolidated Properties [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Exchange rate Debt Instrument, Exchangeable, Exchange Rate Per One Thousand Dollars Debt Instrument, Exchangeable, Exchange Rate Per One Thousand Dollars Net intangible liabilities, remaining weighted average amortization period (in years) Finite-Lived Intangible Liabilities, Remaining Weighted Average Amortization Period Finite-Lived Intangible Liabilities, Remaining Weighted Average Amortization Period Other non-cash amortization Amortization of Other Deferred Charges Accounts, Notes, Loans and Financing Receivable Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Ventas Realty Ventas Realty [Member] Ventas Realty Fair Value Measurement [Domain] Fair Value Measurement [Domain] SENIOR NOTES PAYABLE AND OTHER DEBT Debt Disclosure [Text Block] Preferred stock Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount ATM Programs, Unsettled Forward Sales Agreements At The Market Equity Offering Program, Unsettled Forward Sales Agreement [Member] At The Market Equity Offering Program, Unsettled Forward Sales Agreement Accrued interest payable Interest Payable Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Repayments of senior debt Repayments of Senior Debt Amortization of deferred revenue and lease intangibles, net Amortization Of Deferred Revenue And Lease Intangibles Amortization Of Deferred Revenue And Lease Intangibles Common stock Common Stock, Value, Issued Denominator for diluted earnings per share—adjusted weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Loss on extinguishment of debt, net Extinguishment of Debt, Gain (Loss), Net of Tax Secured loans receivable and investments Secured loans receivable and investments [Member] Secured loans receivable and investments Commitments and contingencies Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Other expense Other expense Other Cost and Expense, Operating Noncontrolling Interests Noncontrolling Interest [Member] Additional periods Additional Periods Additional Periods Document Transition Report Document Transition Report Ownership percentage Equity Method Investment, Ownership Percentage Schedules of Concentration of Risk, by Risk Factor Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Loss from unconsolidated entities Income (loss) from unconsolidated entities Income (Loss) From Equity Method Investments And Remeasurement Gain On Equity Interest In Acquiree This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. This also includes the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest held in an acquiree before a business combination. Net change in borrowings under commercial paper program Proceeds from (Repayments of) Commercial Paper Underlying Securities Award Underlying Securities Amount Concentration Risk Concentration Risk [Line Items] Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount INCOME TAXES Income Tax Disclosure [Text Block] 5.00% Senior Notes due 2026 5.00% Senior Notes due 2026 [Member] 5.00% Senior Notes due 2026 Diluted: Diluted earnings per share: Earnings Per Share, Diluted [Abstract] Forward sales agreements (in shares) Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss Other intangibles Other Finite-Lived Intangible Assets, Gross Dispositions Dispositions [Member] Dispositions [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 4.125% Senior Notes due 2026 4.125% Senior Notes due 2026 [Member] 4.125% Senior Notes due 2026 [Member] Accumulated depreciation and amortization Accumulated Depreciation And Amortization The accumulated depreciation for real estate investments and accumulated amortization of assets lacking physical substance with a finite life. Total equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Allowance Secured Loans, Unsecured Loans, Allowance For Credit Loss Secured Loans, Unsecured Loans, Allowance For Credit Loss 5.10% Senior Notes, Series J due 2029 5.100% Senior Notes, Series J due 2029 [Member] 5.100% Senior Notes, Series J due 2029 Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Equity Offering [Axis] Equity Offering [Axis] Equity Offering Document Type Document Type EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Product and Service [Axis] Product and Service [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Asset Acquisition [Domain] Asset Acquisition [Domain] Issuance of common stock, net Proceeds from Issuance of Common Stock Exchange rate per share (in dollars per share) Debt Instrument, Exchangeable, Exchange Price Per Share Debt Instrument, Exchangeable, Exchange Price Per Share Loss from unconsolidated entities Gain (Loss) From Equity Method Investments And Other Items, Non-cash Portion Gain (Loss) From Equity Method Investments And Other Items, Non-cash Portion Other revenues Management fees Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] 4.13% Senior Notes due 2026 4.13% Senior Notes due 2026 [Member] 4.13% Senior Notes due 2026 Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] ATM Program At The Market Program [Member] At The Market Program Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Value of assets acquired Asset Acquisition, Consideration Transferred Name Forgone Recovery, Individual Name Intangible assets acquired Finite-Lived Intangible Assets Acquired Statistical Measurement [Axis] Statistical Measurement [Axis] Investments in unconsolidated real estate entities Total Investments in unconsolidated real estate entities Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures 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] Variable income from operating leases Operating Lease, Variable Lease Income Disposal Group Classification [Axis] Disposal Group Classification [Axis] Contingent liability Loss Contingency Accrual Ardent Ardent [Member] Ardent [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Summary of Other Assets Schedule of Other Assets [Table Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income attributable to common stockholders Net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Forward Starting Swap Swap One [Member] Swap One Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Net income attributable to common stockholders (in usd per share) Net income (loss) attributable to common stockholders, diluted (in usd per share) Earnings Per Share, Diluted Other lease intangibles Other Indefinite Lived Intangible Liabilities, Gross Other Indefinite Lived Intangible Liabilities, Gross Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Income from loans and investments Interest Income, Operating Title of 12(b) Security Title of 12(b) Security Supplemental schedule of non-cash activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] 5.70% Senior Notes due 2043 5.70% Senior Notes due 2043 [Member] 5.70% Senior Notes due 2043 [Member] 6.90% Senior Notes due 2037 6.90% Senior Notes due 2037 [Member] 6.90% Senior Notes due 2037 [Member] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Investment in unconsolidated operating entities Investment In Unconsolidated Operating Entities Investment In Unconsolidated Operating Entities Segment Properties Held for Sale Number of Properties Classified as Held-for-sale Represents the number of the properties which are classified as held for sale. Treasury Stock, Common, Shares Treasury Stock, Common, Shares Earnings per common share Earnings Per Share [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Controlling interest, percentage Subsidiary, Ownership Percentage, Parent INTANGIBLES Intangibles Disclosure [Text Block] Disclosure of information related to intangible assets and liabilities. INVESTMENTS IN UNCONSOLIDATED ENTITIES Equity Method Investments and Joint Ventures Disclosure [Text Block] Asset Acquisition [Table] Asset Acquisition [Table] Prepaid assets Prepaid Expense Fonds Immobilier Groupe Maurice, S.E.C. Fonds Immobilier Groupe Maurice, S.E.C. [Member] Fonds Immobilier Groupe Maurice, S.E.C. ATM Programs, Settled Forward Sales Agreement At The Market Equity Offering Program, Settled Forward Sales Agreement [Member] At The Market Equity Offering Program, Settled Forward Sales Agreement Accordion feature of debt Debt Instrument, Accordion Limit Debt Instrument, Accordion Limit Additional period term Debt Instrument, Term, Additional Period Debt Instrument, Term, Additional Period Percentage of Total NOI Net Operating Income, Percent Net Operating Income, Percent Income taxes paid, net Income Taxes Paid, Net Principal Amount Due at Maturity Senior Notes and Mortgages [Member] Senior Notes and Mortgages [Member] Unsecured term loan due January 2031 Unsecured Term Loan Due January 2031 [Member] Unsecured Term Loan Due January 2031 3.85% Senior Notes due 2027 3.85% Senior Notes due 2027 [Member] 3.85% Senior Notes due 2027 [Member] Award Timing Disclosures [Line Items] Senior Housing Communities Senior Housing Communities [Member] Senior Housing Communities Mortgage loans and other Total maturities Senior notes payable and other debt, gross Long-Term Debt, Gross Unrealized (loss) gain on available for sale securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Subsidiaries Subsidiaries [Member] STOCKHOLDERS' EQUITY Equity [Text Block] Net real estate property Net Real Estate Property Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land and improvements; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) right of use assets; (8) lease intangibles and (9) other real estate investments. Operating Lease, Lease Income Operating Lease, Lease Income [Table Text Block] Expiration Date Trading Arrangement Expiration Date Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Equity Method Investments Equity Method Investments [Table Text Block] Equity offering program, maximum aggregate amount authorized Equity Offering Program, Maximum Authorized Offering Amount Equity Offering Program, Maximum Authorized Offering Amount Segment Reporting Information Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date 3.75% Exchangeable Senior Notes due 2026 3.75% Exchangeable Senior Notes due 2026 [Member] 3.75% Exchangeable Senior Notes due 2026 Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Customer [Axis] Customer [Axis] Cash distributions to redeemable OP unitholders Cash Distributions To Redeemable OP Unitholders Cash Distributions To Redeemable OP Unitholders Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Delayed Draw Term Loan Facility Delayed Draw Term Loan Facility [Member] Delayed Draw Term Loan Facility Unsecured Revolving Credit Facility and Commercial Paper Notes Line of Credit [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Retained earnings (deficit) Retained Earnings (Accumulated Deficit) Number of real estate properties, wholly owned and unconsolidated Number Of Real Estate Properties, Wholly Owned And Unconsolidated Number Of Real Estate Properties, Wholly Owned And Unconsolidated ATM Programs, Forward Sales Agreement At The Market Equity Offering Program, Forward Sales Agreement [Member] At The Market Equity Offering Program, Forward Sales Agreement Financial Instrument [Axis] Financial Instrument [Axis] CONDENSED CONSOLIDATING BALANCE SHEET Statement of Financial Position [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] Executive Category: Executive Category [Axis] Net intangible liabilities Finite And Indefinite Lived Intangible Liabilities, Net Finite And Indefinite Lived Intangible Liabilities, Net Quarterly dividend threshold for exchange rate adjustment Debt Instrument, Exchangeable, Exchange Rate Adjustment, Quarterly Dividend Threshold Per Share Debt Instrument, Exchangeable, Exchange Rate Adjustment, Quarterly Dividend Threshold Per Share Repayments of debt Repayments of Debt Interest Interest expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date 4.75% Senior Notes due 2030 4.75% Senior Notes due 2030 [Member] 4.75% Senior Notes due 2030 [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 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] Summary of Net Loans Receivable and Investments Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Statement [Table] Statement [Table] Derivative instruments Derivative Liability Schedule of Real Estate Properties [Table] Real Estate Property, Ownership [Table] 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] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Research & Innovation Development Joint Venture R&I JV [Member] R&I JV Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Revenues Revenue Benchmark [Member] Accounts receivable, net Receivables, Net, Current Distributions from unconsolidated entities Proceeds from Equity Method Investment, Distribution Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Ventas Fund Ventas Fund [Member] Ventas Fund All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Long-Term Debt, Percentage Bearing Fixed Interest, Amount Long-Term Debt, Percentage Bearing Fixed Interest, Amount Borrowings Originally Denominated in CAD Borrowings originally denominated in CAD [Member] Borrowings originally denominated in CAD [Member] Controlling Interest Controlling Interest [Member] Controlling Interest Amendment Flag Amendment Flag 2027 Long-Term Debt, Maturity, Year Two Gross real estate investments Real Estate Investments, Gross Amount of real estate investments, which may include the following: (1) land and improvements; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) acquired lease intangibles; (8) lease right of use assets; and (9) other real estate investments. Proceeds from real estate disposals Proceeds from Sale, Real Estate, Held-for-Investment Treasury stock Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] In-place and other lease intangibles Leases Acquired in Place and Other Lease Intangibles [Member] This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property and other lease intangibles. Real Estate Assets Classified As Held For Sale Disclosure of Long-Lived Assets Held-for-Sale [Table Text Block] Property-level operating expenses Direct Costs of Leased and Rented Property or Equipment Receivable [Domain] Receivable [Domain] Cash issued for redemption of OP Units Payments for Repurchase of Other Equity Real estate investments Transfer from Investments Denominator for basic earnings per share—weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Below-market lease intangibles Finite-Lived Intangible Liabilities, Below Market Leases Finite-Lived Intangible Liabilities, Below Market Leases Sales-type lease receivable Sales-type Lease, Lease Receivable Variable Rate Debt Member Variable Rate Debt [Member] Variable Rate Debt Disposal Group Classification [Domain] Disposal Group Classification [Domain] Computation of Basic and Diluted Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Amortization of Debt Issuance Costs Amortization of Debt Issuance Costs Capital in Excess of Par Value Common Stock Including Additional Paid in Capital [Member] Entity Tax Identification Number Entity Tax Identification Number Asset Acquisition [Axis] Asset Acquisition [Axis] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Number of real estate properties Number of real estate properties Number of real estate properties sold Number of Real Estate Properties Net change in borrowings under revolving credit facilities Proceeds from (Repayments of) Lines of Credit 5.10% Senior Notes due 2032 5.10% Senior Notes due 2032 [Member] 5.10% Senior Notes due 2032 Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Secured/mortgage loans and other, net Commercial Mortgage-Backed Securities [Member] 2029 Long-Term Debt, Maturity, Year Four Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Impairment of real estate Impairment of Real Estate Fair value of amount outstanding Line of Credit Facility, Fair Value of Amount Outstanding Accounting Estimates Use of Estimates, Policy [Policy Text Block] Senior housing SHOP Senior Housing Operating Portfolio (SHOP) [Member] Represents the Senior Housing Operating Portfolio (SHOP), a segment of the entity. Construction in progress Construction in Progress, Gross Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Rental income Operating Lease, Lease Income Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Insider Trading Arrangements [Line Items] Non-Segment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Total liabilities Total Liabilities Liabilities Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Borrowings Originally Denominated in GBP Borrowings originally denominated in GBP [Member] Borrowings originally denominated in GBP [Member] Shares issued, average price per share (in USD per share) Shares Issued, Weighted Average Price Per Share Shares Issued, Weighted Average Price Per Share Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Expenses Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Resident fees and services Operating Lease, Lease Income, Fees And Services Operating Lease, Lease Income, Fees And Services Statement Statement [Line Items] NOI Net Operating Income [Member] Total NOI (including amounts in discontinued operations), when it serves as a benchmark in a concentration of risk calculation. Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Long-term Debt, Percentage Bearing Variable Interest, Amount Long-Term Debt, Percentage Bearing Variable Interest, Amount Common Stock Par Value Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] 6.59% Senior Notes due 2038 6.59% Senior Notes due 2038 [Member] 6.59% Senior Notes due 2038 [Member]