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Variable Interest Entities - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
joint_venture
Jun. 30, 2022
USD ($)
joint_venture
property
Mar. 31, 2022
property
Jun. 30, 2022
USD ($)
joint_venture
Dec. 31, 2021
USD ($)
joint_venture
property
Variable Interest Entity [Line Items]          
Exchange accommodation titleholder, real estate, carrying value | $ $ 77 $ 66   $ 66 $ 77
Unconsolidated Variable Interest Entities          
Variable Interest Entity [Line Items]          
Number of unconsolidated joint ventures (in joint ventures) 2 2   2 2
Number of VIE borrowers with marketable debt securities (in joint ventures) 1 1   1 1
Ventures V          
Variable Interest Entity [Line Items]          
VIE ownership percentage       51.00%  
Life Science JV          
Variable Interest Entity [Line Items]          
VIE ownership percentage       99.00%  
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  
Life Science | Needham Land Parcel JV          
Variable Interest Entity [Line Items]          
Investment ownership percentage 38.00% 38.00%   38.00% 38.00%
Payments to acquire equity method investment | $ $ 13        
Medical Office Buildings          
Variable Interest Entity [Line Items]          
Number of properties acquired | property   1 2   2