Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 23, 2019
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 1-10989  
Entity Registrant Name Ventas, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 61-1055020  
Entity Address, Address Line One 353 N. Clark Street  
Entity Address, Address Line Two Suite 3300  
Entity Address, City or Town Chicago  
Entity Address, State or Province IL  
Entity Address, Country US  
Entity Address, Postal Zip Code 60654  
City Area Code 877  
Local Phone Number 483-6827  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Trading Symbol VTR  
Title of 12(b) Security Common Stock, $0.25 par value  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   372,584,521
Entity Shell Company false  
Entity Central Index Key 0000740260  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false