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Real Estate and Other Activities - Other Investment Activities - Additional Information (Detail)
SFr in Millions, $ in Millions
12 Months Ended
Nov. 03, 2023
USD ($)
Aug. 17, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CHF (SFr)
Dec. 31, 2022
USD ($)
Steward Health Care System L L C [Member]          
Business Acquisition [Line Items]          
Other investment on secured loan with credit facility collateral   $ 40      
Secured loan amount         $ 150
Repayment received on credit facility availed $ 2        
Repayment received on credit facility availed, total amount $ 5        
Repayments of mortgage loan     $ 100 SFr 60  
Steward Health Care System L L C [Member] | Asset-Backed Securities [Member]          
Business Acquisition [Line Items]          
Investments     $ 105    
Sale of investment   105      
Global Asset Manager [Member]          
Business Acquisition [Line Items]          
Sale of investment   $ 100