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Loans - Summary of Loans (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Loans Receivable [Line Items]      
Subtotal $ 115,557 $ 110,345  
Allowance for loan losses (3,714) (1,441) $ (1,066)
Total loans receivable 111,843 108,904  
Subtotal 13,881 14,386  
Amortized cost [Member]      
Loans Receivable [Line Items]      
Subtotal 99,170 90,636  
Allowance for loan losses (3,714) (1,441)  
Total loans receivable 95,456 89,195  
Subtotal 96,615 89,186  
Fair Value [Member]      
Loans Receivable [Line Items]      
Total loans receivable 13,881 14,386  
Subtotal 13,881 14,386  
Held for sale [Member]      
Loans Receivable [Line Items]      
Total loans receivable 2,506 5,323  
Subtotal 2,513 5,409  
Subtotal 2,506 5,323  
Corporate [Member]      
Loans Receivable [Line Items]      
Subtotal 51,465 46,307  
Subtotal 2,856 3,224  
Corporate [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Subtotal 47,583 41,129  
Corporate [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Subtotal 2,856 3,224  
Corporate [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Subtotal 1,026 1,954  
Wealth management [Member]      
Loans Receivable [Line Items]      
Subtotal 29,836 27,940  
Subtotal 8,037 7,824  
Wealth management [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Subtotal 21,799 20,116  
Wealth management [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Subtotal 8,037 7,824  
Commercial real estate [Member]      
Loans Receivable [Line Items]      
Subtotal 18,377 17,743  
Subtotal 1,980 1,876  
Commercial real estate [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Subtotal 15,421 13,258  
Commercial real estate [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Subtotal 1,980 1,876  
Commercial real estate [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Subtotal 976 2,609  
Residential real estate [Member]      
Loans Receivable [Line Items]      
Subtotal 4,705 6,958  
Subtotal 446 792  
Residential real estate [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Subtotal 4,236 6,132  
Residential real estate [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Subtotal 446 792  
Residential real estate [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Subtotal 23 34  
Installment [Member]      
Loans Receivable [Line Items]      
Subtotal 4,112 4,747  
Installment [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Subtotal 4,112 4,747  
Credit card [Member]      
Loans Receivable [Line Items]      
Subtotal 2,908 1,858  
Credit card [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Subtotal 2,908 1,858  
Other Loans [Member]      
Loans Receivable [Line Items]      
Subtotal 4,154 4,792  
Subtotal 562 670  
Other Loans [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Subtotal 3,111 3,396  
Other Loans [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Subtotal 562 670  
Other Loans [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Subtotal $ 481 $ 726