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Loans Receivable - HC-One Facility (Details) - HC-One Facility
£ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
GBP (£)
Apr. 30, 2015
GBP (£)
Dec. 31, 2017
property
Dec. 31, 2015
USD ($)
Dec. 31, 2015
GBP (£)
Loans Receivable            
Amount of facility converted into sale-leaseback transaction | £     £ 174      
Number of properties spinoff into a separate joint venture | property       36    
Cash payments received from borrower $ 367 £ 283     $ 52 £ 34