Document and Entity Information (USD $)	3 Months Ended
	Sep. 30, 2012	Oct. 31, 2012	Jun. 30, 2012
Document And Entity Information [Abstract]
Entity Registrant Name	HEALTH CARE REIT INC /DE/
Entity Central Index Key	0000766704
Document Type	10-Q
Document Period End date	Sep. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
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			$ 12,459,634,449
Entity Common Stock Shares Outstanding		259,682,359