v3.21.2
Unsecured Borrowings - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Unsecured Long-Term Borrowings Maturities, Range, End 2065  
Minimum redemption or purchase price required $ 253  
Unsecured long-term borrowings for which the firm did not elect the fair value option 194,900 $ 172,570
Fair value of unsecured long-term borrowings $ 203,300 $ 183,290
Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Subordinated debt maturities, range 2025 2045
Goldman Sachs Capital I [Member]    
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  
Junior subordinated debt, outstanding par amount 968 $ 968
Trust Preferred Securities, outstanding par amount 939 939
Common beneficial interests, outstanding par amount $ 29 $ 29
Interest Rate of Junior Subordinated Debentures held by certain third parties 6.345%  
Maturity date of Junior Subordinated Debentures held by certain third parties Feb. 15, 2034  
Interest Rate of Junior Subordinated Debentures issued to Trust, Fixed 6.345%  
Maturity date of Junior Subordinated Debentures issued to Trust Feb. 15, 2034