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Variable Interest Entities - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2024
USD ($)
hospital
joint_venture
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   5.00%    
Equity investment, percentage of total fund commitments   $ 10    
Funding period   5 years    
Lab | Needham Land Parcel JV        
Variable Interest Entity [Line Items]        
Investment ownership percentage 38.00%      
Payments to acquire equity method investment $ 13      
Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Number of unconsolidated joint ventures | joint_venture   2 2  
Variable Interest Entity, Not Primary Beneficiary | Commercial Mortgage-Backed Securities        
Variable Interest Entity [Line Items]        
Number of hospitals | hospital   3    
Debt securities       $ 22
Ventures V, LLC        
Variable Interest Entity [Line Items]        
Ownership percentage   51.00%    
Downreit Partnerships        
Variable Interest Entity [Line Items]        
Number of DownREIT LLCs (in entities) | joint_venture   8 7  
Callan Ridge JV        
Variable Interest Entity [Line Items]        
Ownership percentage     98.00%  
MSREI MOB JV        
Variable Interest Entity [Line Items]        
Ownership percentage   51.00%