XML 252 R86.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Variable Interest Entities - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
Dec. 31, 2021
USD ($)
Mar. 31, 2024
joint_venture
hospital
Dec. 31, 2023
joint_venture
Dec. 31, 2022
USD ($)
Lab | Needham Land Parcel JV        
Variable Interest Entity [Line Items]        
Investment ownership percentage 38.00% 38.00%    
Payments to acquire equity method investment | $ $ 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%    
Lab JV        
Variable Interest Entity [Line Items]        
VIE ownership percentage   98.00%    
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