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Variable Interest Entities - Narrative (Details)
$ in Millions
1 Months Ended 9 Months Ended
Dec. 31, 2021
USD ($)
Sep. 30, 2023
joint_venture
hospital
Dec. 31, 2022
USD ($)
joint_venture
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)   2 2
Number of VIE borrowers with marketable debt securities (in joint ventures)     1
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 controlling ownership interest entities as a managing member   7