v3.21.2
Loans - Summary of Loans (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Loans Receivable [Line Items]            
Gross loans receivable $ 133,808   $ 119,989      
Allowance for loan losses (3,271) $ (3,515) (3,874) $ (3,901) $ (2,868) $ (2,168)
Total loans receivable 130,537   116,115      
Loans at fair value 12,516   13,625      
Amortized cost [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 119,311   103,565      
Allowance for loan losses (3,271)   (3,874)      
Total loans receivable 116,040   99,691      
Fair Value [Member]            
Loans Receivable [Line Items]            
Total loans receivable 12,516   13,625      
Loans at fair value 12,516   13,625      
Held for sale [Member]            
Loans Receivable [Line Items]            
Total loans receivable 1,981   2,799      
Loans held for sale 1,981   2,799      
Corporate [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 47,814   48,659      
Loans at fair value 2,786   2,751      
Corporate [Member] | Amortized cost [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 44,153   44,778      
Corporate [Member] | Fair Value [Member]            
Loans Receivable [Line Items]            
Loans at fair value 2,786   2,751      
Corporate [Member] | Held for sale [Member]            
Loans Receivable [Line Items]            
Loans held for sale 875   1,130      
Wealth management [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 39,955   33,023      
Loans at fair value 7,122   7,872      
Wealth management [Member] | Amortized cost [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 32,833   25,151      
Wealth management [Member] | Fair Value [Member]            
Loans Receivable [Line Items]            
Loans at fair value 7,122   7,872      
Commercial real estate [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 19,468   20,290      
Loans at fair value 1,677   1,961      
Commercial real estate [Member] | Amortized cost [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 17,321   17,096      
Commercial real estate [Member] | Fair Value [Member]            
Loans Receivable [Line Items]            
Loans at fair value 1,677   1,961      
Commercial real estate [Member] | Held for sale [Member]            
Loans Receivable [Line Items]            
Loans held for sale 470   1,233      
Residential real estate [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 12,218   5,750      
Loans at fair value 417   494      
Residential real estate [Member] | Amortized cost [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 11,696   5,236      
Residential real estate [Member] | Fair Value [Member]            
Loans Receivable [Line Items]            
Loans at fair value 417   494      
Residential real estate [Member] | Held for sale [Member]            
Loans Receivable [Line Items]            
Loans held for sale 105   20      
Installment [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 3,257   3,823      
Installment [Member] | Amortized cost [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 3,257   3,823      
Credit card [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 5,210   4,270      
Credit card [Member] | Amortized cost [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 5,210   4,270      
Other Loans [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 5,886   4,174      
Loans at fair value 514   547      
Other Loans [Member] | Amortized cost [Member]            
Loans Receivable [Line Items]            
Gross loans receivable 4,841   3,211      
Other Loans [Member] | Fair Value [Member]            
Loans Receivable [Line Items]            
Loans at fair value 514   547      
Other Loans [Member] | Held for sale [Member]            
Loans Receivable [Line Items]            
Loans held for sale $ 531   $ 416