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Credit Concentration (Details) (USD $)
12 Months Ended
Dec. 31, 2014
properties
Dec. 31, 2013
Dec. 31, 2012
Concentration by investment: (1)      
Number of properties in diversified portfolio 1,260us-gaap_NumberOfRealEstateProperties    
Net real estate investments $ 22,851,196,000us-gaap_RealEstateInvestments $ 21,680,221,000us-gaap_RealEstateInvestments  
Percent of Investment 100.00%us-gaap_ConcentrationRiskPercentage1 [1],[2]    
Total revenues 3,343,546,000us-gaap_Revenues 2,880,608,000us-gaap_Revenues 1,805,044,000us-gaap_Revenues
Credit Concentration (Textuals) [Abstract]      
Percentage total investments with top five customers   44.00%hcn_PercentageTotalInvestmentsWithTopFiveCustomers  
Sunrise Senior Living [Member]      
Concentration by investment: (1)      
Number of properties in diversified portfolio 136us-gaap_NumberOfRealEstateProperties
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_SunriseSeniorLivingMember
[1],[3]    
Net real estate investments 4,130,125,000us-gaap_RealEstateInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_SunriseSeniorLivingMember
[1],[3]    
Percent of Investment 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_SunriseSeniorLivingMember
[1],[2],[3]    
Total revenues 895,897,000us-gaap_Revenues
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_SunriseSeniorLivingMember
   
Genesis Health Care LLC [Member]      
Concentration by investment: (1)      
Number of properties in diversified portfolio 181us-gaap_NumberOfRealEstateProperties
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_GenesisHealthCareLlcMember
[1]    
Net real estate investments 2,657,907,000us-gaap_RealEstateInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_GenesisHealthCareLlcMember
[1]    
Percent of Investment 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_GenesisHealthCareLlcMember
[1],[2]    
Revera [Member]      
Concentration by investment: (1)      
Number of properties in diversified portfolio 48us-gaap_NumberOfRealEstateProperties
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_ReveraMember
[1]    
Net real estate investments 1,038,099,000us-gaap_RealEstateInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_ReveraMember
[1]    
Percent of Investment 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_ReveraMember
[1],[2]    
Benchmark Senior Living, LLC [Member]      
Concentration by investment: (1)      
Number of properties in diversified portfolio 39us-gaap_NumberOfRealEstateProperties
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_BenchmarkSeniorLivingLlcMember
[1]    
Net real estate investments 917,995,000us-gaap_RealEstateInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_BenchmarkSeniorLivingLlcMember
[1]    
Percent of Investment 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_BenchmarkSeniorLivingLlcMember
[1],[2]    
Remaining Portfolio [Member]      
Concentration by investment: (1)      
Number of properties in diversified portfolio 710us-gaap_NumberOfRealEstateProperties
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_RemainingPortfolioMember
[1]    
Net real estate investments 12,705,236,000us-gaap_RealEstateInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_RemainingPortfolioMember
[1]    
Percent of Investment 55.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_RemainingPortfolioMember
[1],[2]    
Brookdale Senior Living, Inc. [Member]      
Concentration by investment: (1)      
Number of properties in diversified portfolio 146us-gaap_NumberOfRealEstateProperties
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_BrookdaleSeniorLivingIncMember
[1]    
Net real estate investments $ 1,401,834,000us-gaap_RealEstateInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_BrookdaleSeniorLivingIncMember
[1]    
Percent of Investment 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_BrookdaleSeniorLivingIncMember
[1],[2]    
Top Five Relationships [Member]      
Concentration by investment: (1)      
Percent of Investment   44.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= hcn_TopFiveRelationshipsMember
 
[1]
Genesis is in our seniors housing triple-net segment. Sunrise Senior Living and Revera are in our seniors housing operating segment. Brookdale and Benchmark are in both our seniors housing triple-net and seniors housing operating segments.
[2]
Investments with our top five relationships comprised 44% of total investments at December 31, 2013.
[3]
For the year ended December 31, 2014, we recognized $895,897,000 of revenue from Sunrise Senior Living.