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Unsecured Borrowings - Additional Information (Detail)
$ in Millions
Sep. 30, 2025
USD ($)
Segment
Dec. 31, 2024
USD ($)
Dec. 31, 2004
USD ($)
Junior subordinated debt      
Debt Instrument [Line Items]      
Subordinated debt, par amount $ 968 $ 968  
Deferral of interest payments, consecutive semi-annual periods | Segment 10    
Goldman Sachs Capital I      
Debt Instrument [Line Items]      
Junior subordinated debentures issued to Goldman Sachs Capital I (Trust)     $ 2,840
Guaranteed preferred beneficial interests issued to third parties     2,750
Common beneficial interests issued to Group Inc.     $ 85
Trust Preferred Securities, outstanding par amount $ 939 939  
Common beneficial interests, outstanding par amount $ 29 $ 29  
Interest rate on junior subordinated debt issued to third parties 6.345%