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Variable Interest Entities - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
joint_venture
Dec. 31, 2022
USD ($)
joint_venture
hospital
Dec. 31, 2021
USD ($)
property
joint_venture
Variable Interest Entity [Line Items]      
Number of hospitals | hospital   3  
Carrying value of exchange accommodation titleholder, carrying value | $ $ 77   $ 77
Life Science | Needham Land Parcel JV      
Variable Interest Entity [Line Items]      
Investment ownership percentage 38.00% 38.00% 38.00%
Payments to acquire equity method investments | $ $ 13    
Life Science | Life Science JV      
Variable Interest Entity [Line Items]      
Investment ownership percentage   49.00%  
Medical Office      
Variable Interest Entity [Line Items]      
Number of properties acquired | property     2
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Number of unconsolidated joint ventures | joint_venture 2 2 2
Number of VIE borrowers with marketable debt securities | joint_venture 1 1 1
Variable Interest Entity, Not Primary Beneficiary | Commercial Mortgage-Backed Securities      
Variable Interest Entity [Line Items]      
Debt securities | $   $ 22  
Ventures V, LLC      
Variable Interest Entity [Line Items]      
Ownership percentage   51.00%  
MSREI MOB JV      
Variable Interest Entity [Line Items]      
Ownership percentage   51.00%  
DownREIT Partnerships      
Variable Interest Entity [Line Items]      
Controlling interest entity controlling ownership interest | joint_venture   7  
Life Science JV      
Variable Interest Entity [Line Items]      
Ownership percentage   99.00%