v3.21.2
Business Segments - Summary of Gross Loans by Segment and Loan and Allowance for Loan Losses (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]            
Loans, gross $ 133,808   $ 119,989      
Allowance for loan losses (3,271) $ (3,515) (3,874) $ (3,901) $ (2,868) $ (2,168)
Loans 130,537   116,115      
Investment Banking [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 25,087   27,866      
Allowance for loan losses (951)   (1,322)      
Loans 24,136   26,544      
Global Markets [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 43,482   33,662      
Allowance for loan losses (442)   (448)      
Loans 43,040   33,214      
Asset Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 16,817   17,345      
Allowance for loan losses (749)   (787)      
Loans 16,068   16,558      
Consumer & Wealth Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 48,422   41,116      
Allowance for loan losses (1,129)   (1,317)      
Loans 47,293   39,799      
Corporate [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 47,814   48,659      
Corporate [Member] | Investment Banking [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 25,087   27,866      
Corporate [Member] | Global Markets [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 15,292   13,248      
Corporate [Member] | Asset Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 7,435   7,545      
Real Estate [Member] | Global Markets [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 23,008   16,915      
Real Estate [Member] | Asset Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 8,678   9,125      
Other [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 5,886   4,174      
Other [Member] | Global Markets [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 5,182   3,499      
Other [Member] | Asset Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 704   675      
Wealth Management [Member] | Consumer & Wealth Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 39,955   33,023      
Installment [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 3,257   3,823      
Installment [Member] | Consumer & Wealth Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 3,257   3,823      
Credit Card Receivable [Member]            
Segment Reporting Information [Line Items]            
Loans, gross 5,210   4,270      
Credit Card Receivable [Member] | Consumer & Wealth Management [Member]            
Segment Reporting Information [Line Items]            
Loans, gross $ 5,210   $ 4,270