v3.22.0.1
Loans - Summary of Loans (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Loans Receivable [Line Items]      
Gross loans receivable $ 162,135 $ 119,989  
Allowance for loan losses (3,573) (3,874) $ (2,168)
Total loans receivable 158,562 116,115  
Loans at fair value 10,769 13,625  
Amortized cost [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 143,507 103,565  
Allowance for loan losses (3,573) (3,874)  
Total loans receivable 139,934 99,691  
Fair Value [Member]      
Loans Receivable [Line Items]      
Allowance for loan losses 0 0  
Total loans receivable 10,769 13,625  
Loans at fair value 10,769 13,625  
Held for sale [Member]      
Loans Receivable [Line Items]      
Allowance for loan losses 0 0  
Total loans receivable 7,859 2,799  
Loans held for sale 7,859 2,799  
Corporate [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 55,927 48,659  
Loans at fair value 2,492 2,751  
Corporate [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 50,960 44,778  
Corporate [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Loans at fair value 2,492 2,751  
Corporate [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Loans held for sale 2,475 1,130  
Wealth management [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 43,998 33,023  
Loans at fair value 5,936 7,872  
Wealth management [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 38,062 25,151  
Wealth management [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Loans at fair value 5,936 7,872  
Wealth management [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Loans held for sale 0 0  
Commercial real estate [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 25,883 20,290  
Loans at fair value 1,588 1,961  
Commercial real estate [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 21,150 17,096  
Commercial real estate [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Loans at fair value 1,588 1,961  
Commercial real estate [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Loans held for sale 3,145 1,233  
Residential real estate [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 15,913 5,750  
Loans at fair value 320 494  
Residential real estate [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 15,493 5,236  
Residential real estate [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Loans at fair value 320 494  
Residential real estate [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Loans held for sale 100 20  
Installment [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 3,672 3,823  
Installment [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 3,672 3,823  
Installment [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Loans at fair value 0 0  
Installment [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Loans held for sale 0 0  
Credit card [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 8,212 4,270  
Credit card [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 8,212 4,270  
Credit card [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Loans at fair value 0 0  
Credit card [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Loans held for sale 0 0  
Other Loans [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 8,530 4,174  
Loans at fair value 433 547  
Other Loans [Member] | Amortized cost [Member]      
Loans Receivable [Line Items]      
Gross loans receivable 5,958 3,211  
Other Loans [Member] | Fair Value [Member]      
Loans Receivable [Line Items]      
Loans at fair value 433 547  
Other Loans [Member] | Held for sale [Member]      
Loans Receivable [Line Items]      
Loans held for sale $ 2,139 $ 416