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Real Estate and Other Activities - 2021 Activity - Additional Information (Detail)
£ in Millions, SFr in Millions, $ in Millions
Jun. 25, 2021
GBP (£)
Property
Jan. 19, 2021
GBP (£)
Jan. 08, 2021
USD ($)
Mar. 14, 2022
Apr. 16, 2021
CHF (SFr)
Business Acquisition [Line Items]          
Ownership interest       50.00%  
Swiss Medical Network [Member]          
Business Acquisition [Line Items]          
Equity investment | SFr         SFr 145
Waterland Private Equity Fund VII C.V. [Member]          
Business Acquisition [Line Items]          
Number of real estate assets acquired | Property 35        
Payment for acquisition £ 800        
Purchase price of acquisition loan   £ 250      
Ownership interest   9.90%      
Waterland Private Equity Fund VII C.V. [Member] | United Kingdom [Member]          
Business Acquisition [Line Items]          
Purchase price of acquisition   £ 800      
Steward Health Care System LLC [Member]          
Business Acquisition [Line Items]          
Ownership interest     9.90%    
Percentage of interest rate with possible outside returns     4.00%    
Other loan to affiliates | $     $ 335    
Initial term of loan     7 years