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Real Estate Transactions - U.K. Portfolio (Details)
£ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Aug. 31, 2018
GBP (£)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2018
GBP (£)
Real Estate [Line Items]                          
Assets $ 14,032,891,000     $ 14,032,891,000           $ 14,032,891,000 $ 12,718,553,000    
Gain (loss) on sales of real estate, net       $ 11,000,000 $ 0 $ 11,000,000 $ 8,000,000 $ 95,000,000 $ 25,000,000 $ 22,900,000 $ 925,985,000 $ 356,641,000  
U.K. Portfolio                          
Real Estate [Line Items]                          
Interest sold 49.00%   51.00%                    
Assets     $ 507,000,000           $ 507,000,000       £ 382
Gross proceeds     402,000,000                    
Gain (loss) on sales of real estate, net     11,000,000                    
Foreign currency translation reclassified from OCI     $ 17,000,000                    
U.K. Portfolio                          
Real Estate [Line Items]                          
Noncontrolling interest (as a percent)     49.00%           49.00%       49.00%
U.K. Portfolio                          
Real Estate [Line Items]                          
Investments     $ 105,000,000           $ 105,000,000        
Maria Mallaband Care Group loan                          
Real Estate [Line Items]                          
Proceeds from sale of receivables | £   £ 11