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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2015
Jan. 31, 2016
Jun. 30, 2015
Document And Entity Information [Abstract]      
Entity Registrant Name WELLTOWER INC. /DE/    
Entity Central Index Key 0000766704    
Document Type 10-K    
Document Period End date Dec. 31, 2015    
Amendment Flag false    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 23,029,716,957
Entity Common Stock Shares Outstanding   355,140,936