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Real Estate and Other Activities - Other Investment Activities - Additional Information (Detail)
SFr in Millions, $ in Millions
3 Months Ended
Nov. 03, 2023
USD ($)
Aug. 17, 2023
USD ($)
Jun. 30, 2023
CHF (SFr)
Sep. 30, 2023
USD ($)
Steward Health Care System LLC [Member]        
Business Acquisition [Line Items]        
Repayments of mortgage loan | SFr     SFr 60  
Other investment on secured loan with credit facility collateral   $ 40    
Steward Health Care System LLC [Member] | Asset Backed Credit Facility [Member]        
Business Acquisition [Line Items]        
Investments       $ 105
Sale of investment   105    
Steward Health Care System LLC [Member] | Subsequent Event [Member]        
Business Acquisition [Line Items]        
Repayment received on credit facility availed $ 2      
Repayment received on credit facility availed, total amount $ 5      
Global Asset Manager [Member]        
Business Acquisition [Line Items]        
Sale of investment   $ 100