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Variable Interest Entities - Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended
Dec. 31, 2021
USD ($)
Jun. 30, 2024
joint_venture
hospital
Dec. 31, 2023
joint_venture
Dec. 31, 2022
USD ($)
Needham Land Parcel JV | Lab Buildings        
Variable Interest Entity [Line Items]        
Investment ownership percentage 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  
Unconsolidated Variable Interest Entities | Commercial Mortgage-Backed Securities        
Variable Interest Entity [Line Items]        
Number of hospitals | hospital   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 7  
Lab JV        
Variable Interest Entity [Line Items]        
VIE ownership percentage   98.00%