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Commitments, Contingencies and Guarantees - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Summary Of Commitments And Contingent Liabilities [Line Items]              
Other commitments   $ 547,520 $ 447,126        
Carrying value of lending commitments liabilities   1,070 929        
Lending commitment allowance   800 674 $ 749 $ 697 $ 652 $ 620
Estimated fair value of lending commitments liabilities   5,680 4,840        
Carrying value of lending commitments liabilities   65 43        
Commitments to invest in funds managed by the firm   1,120 1,100        
Credit cards              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Held for sale     14,320        
Securities Lending Indemnification              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Maximum payout of indemnifications   $ 16,300 $ 10,620        
Collateral held   16.93 billion 11.02 billion        
Fixed Income Clearing Guarantees              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Maximum payout of indemnifications   $ 134,230 $ 47,440        
Collateral held   134.09 billion 46.96 billion        
Level 2              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Estimated fair value of lending commitments liabilities   $ 3,330 $ 2,440        
Level 3              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Estimated fair value of lending commitments liabilities   2,350 $ 2,400        
GS Malaysia Development Berhad | Guarantee Obligations              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Maximum payout of indemnifications   $ 1,400          
Guarantor obligations, requested payment $ 1,000