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Real Property Acquisitions and Development (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 26, 2018
USD ($)
properties
Number
$ / shares
Dec. 31, 2018
Business Acquisition [Line Items]    
Seniors Housing Properties Leased To Operators Under Existing Triple Net Leases 14  
Multi Tenant Medical Office Building Leased To Various Tenants | Number 1  
Commitment To Unsecured Credit Facility Maximum Borrowing Capacity | $ $ 1,000  
Term loan facility term   2 years
Quality Care Properties Inc. (QCP)    
Business Acquisition [Line Items]    
Business Acquisition, Share Price | $ / shares $ 20.75  
Business Combination, Consideration Transferred | $ $ 3,500  
Joint Venture With ProMedica [Member]    
Business Acquisition [Line Items]    
Equity method investment, ownership percentage 80.00%  
ProMedica Member [Member]    
Business Acquisition [Line Items]    
Total Senior Housing Properties Leased to Promedica 218  
Lessor, Operating Lease, Lease Not yet Commenced, Term of Contract 15 years  
Lease Agreement Number Of Renewal Options 3  
Lessor, Operating Lease, Lease Not yet Commenced, Renewal Term 5 years  
Proceeds from Rents Received | $ $ 179  
Lease Agreement Escalator In Year One 1.375%  
Lease Agreement Annual Escalator Thereafter 2.75%  
ProMedica Member [Member] | Joint Venture With ProMedica [Member]    
Business Acquisition [Line Items]    
Equity method investment, ownership percentage 20.00%  
Held For Sale [Member]    
Business Acquisition [Line Items]    
Seniors Housing Properties Leased To Promedica Under A Non Yielding Lease 59  
Seniors Housing Properties Leased To Operators Under Existing Triple Net Leases 12  
Surgery Center Leased To Operators Under Existing Triple Net Leases 1