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Loans Receivable - Tandem Health Care Loan (Details) - USD ($)
$ in Millions
1 Months Ended
Mar. 31, 2018
May 31, 2015
Loans receivable    
Interest income related to loans $ 3  
Tandem Health Care Loan    
Loans receivable    
Loans receivable, other   $ 257
Write down of loans receivable $ 112