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Real Estate Transactions - SHOP Joint Venture (Details)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
property
Dec. 31, 2018
property
Assets Leased to Others    
Real Estate [Line Items]    
Number of assets transitioned   37
Assets Leased to Others | SHOP    
Real Estate [Line Items]    
Number of assets transitioned   20
SHOP JV | Subsequent Event    
Real Estate [Line Items]    
Purchase cost | $ $ 367  
Partnership investment ownership percentage 46.50%  
SHOP JV | SHOP | Subsequent Event    
Real Estate [Line Items]    
Investment ownership percentage 53.50%  
Purchase cost | $ $ 790  
SHOP JV | Assets Leased to Others | SHOP | Subsequent Event    
Real Estate [Line Items]    
Number of assets transitioned 19