v3.21.2
Business Segments - Summary of Gross Loans by Segment and Loan and Allowance for Loan Losses (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]            
Loans, gross $ 146,956   $ 119,989      
Allowance for loan losses (3,332) $ (3,271) (3,874) $ (3,714) $ (3,901) $ (2,168)
Loans 143,624   116,115      
Investment Banking [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 27,346   27,866      
Allowance for loan losses (918)   (1,322)      
Loans 26,428   26,544      
Global Markets [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 51,591   33,662      
Allowance for loan losses (424)   (448)      
Loans 51,167   33,214      
Asset Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 16,544   17,345      
Allowance for loan losses (752)   (787)      
Loans 15,792   16,558      
Consumer & Wealth Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 51,475   41,116      
Allowance for loan losses (1,238)   (1,317)      
Loans 50,237   39,799      
Corporate [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 54,107   48,659      
Corporate [Member] | Investment Banking [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 27,346   27,866      
Corporate [Member] | Global Markets [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 19,349   13,248      
Corporate [Member] | Asset Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 7,412   7,545      
Real Estate [Member] | Global Markets [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 26,641   16,915      
Real Estate [Member] | Asset Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 8,425   9,125      
Other [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 6,308   4,174      
Other [Member] | Global Markets [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 5,601   3,499      
Other [Member] | Asset Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 707   675      
Wealth Management [Member] | Consumer & Wealth Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 41,775   33,023      
Installment [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 3,449   3,823      
Installment [Member] | Consumer & Wealth Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 3,449   3,823      
Credit Card Receivable [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 6,251   4,270      
Credit Card Receivable [Member] | Consumer & Wealth Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross $ 6,251   $ 4,270