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Real Estate Transactions - RIDEA II Sale Transaction (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2018
Jan. 31, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 01, 2017
Real Estate [Line Items]                          
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  
HCP/CPA/Brookdale JV                          
Real Estate [Line Items]                          
Debt provided   $ 602,000,000                      
Debt provided by third-party   360,000,000                      
Debt provided by entity   242,000,000                      
Net proceeds from the RIDEA II transaction   $ 480,000,000                      
RIDEA II                          
Real Estate [Line Items]                          
Investment ownership percentage   40.00%                      
Gain (loss) on sales of real estate, net             $ 99,000,000            
RIDEA II | HCP/CPA/Brookdale JV                          
Real Estate [Line Items]                          
Investment ownership percentage   40.00%                      
RIDEA II | HCP/CPA/Brookdale JV                          
Real Estate [Line Items]                          
Debt provided by entity                         $ 242,000,000
Consideration receivable from sale of ownership interest                         $ 91,000,000
Proceeds from sale of asset $ 332,000,000