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Loans - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]      
Accrued interest receivable $ 1,300 $ 1,300  
TDRs 1,800 1,800 $ 1,700
Commitments to lend on loans modified in TDRs 145 145 178
Loans held for sale 711 711 400
Federal Home Loan banks      
Loans and Leases Receivable Disclosure [Line Items]      
Loans Pledged as Collateral 15,700 15,700 14,600
Line of Credit Facility, Remaining Borrowing Capacity 17,900 17,900 18,700
Federal Reserve Discount Window      
Loans and Leases Receivable Disclosure [Line Items]      
Loans Pledged as Collateral 28,200 28,200 6,700
Line of Credit Facility, Remaining Borrowing Capacity 22,200 22,200 5,300
Credit Card and Consumer Banking | Performing      
Loans and Leases Receivable Disclosure [Line Items]      
TDRs 1,200 1,200 1,100
Commercial Banking | Performing      
Loans and Leases Receivable Disclosure [Line Items]      
TDRs 349 349 $ 224
Domestic credit card: | Credit Card      
Loans and Leases Receivable Disclosure [Line Items]      
Revolving loans converted to term during period $ 89 $ 249