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Variable Interest Entities - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Sep. 30, 2024
USD ($)
joint_venture
hospital
Sep. 30, 2024
USD ($)
joint_venture
hospital
Dec. 31, 2023
joint_venture
Dec. 31, 2022
USD ($)
PropTech          
Variable Interest Entity [Line Items]          
Payments to acquire equity investments   $ 1      
Equity investment, aggregate cost   $ 10 $ 10    
Equity investment, percentage of total fund commitments   5.00% 5.00%    
Funding period   5 years      
Needham Land Parcel JV | Lab Buildings          
Variable Interest Entity [Line Items]          
Investment ownership percentage 38.00% 38.00% 38.00%    
Cash paid $ 13        
Unconsolidated Variable Interest Entities          
Variable Interest Entity [Line Items]          
Number of unconsolidated joint ventures (in joint ventures) | joint_venture   2 2 2  
Unconsolidated Variable Interest Entities | Commercial Mortgage-Backed Securities          
Variable Interest Entity [Line Items]          
Number of hospitals | hospital   3 3    
Debt securities         $ 22
Ventures V          
Variable Interest Entity [Line Items]          
VIE ownership percentage     51.00%    
MSREI JV          
Variable Interest Entity [Line Items]          
VIE ownership percentage     51.00%    
DownREIT Partnerships          
Variable Interest Entity [Line Items]          
Number of DownREIT LLCs | joint_venture   8 8 7  
Lab JV          
Variable Interest Entity [Line Items]          
VIE ownership percentage       98.00%