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Investments in and Advances to Unconsolidated Joint Ventures - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 01, 2022
USD ($)
property
Jan. 31, 2020
USD ($)
Jan. 31, 2022
USD ($)
May 31, 2021
USD ($)
property
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Apr. 30, 2021
property
Apr. 30, 2021
Apr. 30, 2021
preferred_equity_investment
Apr. 30, 2021
joint_venture
Schedule of Equity Method Investments [Line Items]                    
Difference between carrying amount and underlying equity         $ 41 $ 42        
Gain (loss) on deconsolidation         $ 311          
Brookedale MTCA                    
Schedule of Equity Method Investments [Line Items]                    
Cash proceeds   $ 385                
Discovery Naples JV and Discovery Sarasota JV                    
Schedule of Equity Method Investments [Line Items]                    
Number of unconsolidated joint ventures | joint_venture                   2
Discovery Naples JV                    
Schedule of Equity Method Investments [Line Items]                    
Investment ownership percentage               41.00%    
Discovery Sarasota JV                    
Schedule of Equity Method Investments [Line Items]                    
Investment ownership percentage               47.00%    
CCRV JV Investment | Brookedale MTCA                    
Schedule of Equity Method Investments [Line Items]                    
Number of properties sold | property       2            
CCRC JV Investment                    
Schedule of Equity Method Investments [Line Items]                    
Investment ownership percentage   49.00%   49.00%            
Proceeds from sale of buildings       $ 19            
CCRC JV Investment | Brookedale MTCA                    
Schedule of Equity Method Investments [Line Items]                    
Proceeds from sale of buildings       $ 38            
Life Science                    
Schedule of Equity Method Investments [Line Items]                    
Proceeds from sale of buildings     $ 14              
Life Science | Life Science Joint Venture In San Francisco, California                    
Schedule of Equity Method Investments [Line Items]                    
Investment ownership percentage 70.00%                  
Property count | property 7                  
Life Science | Life Science Joint Venture In San Francisco, California | Life Science Joint Venture In San Francisco, California                    
Schedule of Equity Method Investments [Line Items]                    
Investment ownership percentage 30.00%                  
Cash proceeds $ 126                  
Discovery SHOP Portfolio | Senior Housing Operating Portfolio                    
Schedule of Equity Method Investments [Line Items]                    
Number of preferred equity method investments sold             2   2