Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Commercial Loans - Impaired Loans (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Commercial Loans - Impaired Loans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Financing receivable, trouble debt restructuring $ 1,700 $ 2,200  
Loans held-for-sale 9,243 9,158  
Proceeds from sales and paydowns of loans originally classified as LHFS 20,100 30,600 $ 29,200
Originations and purchases 19,657 28,874 $ 28,071
Accrued interest receivable 2,400 2,600  
Credit card lines      
Financing Receivable, Impaired [Line Items]      
Interest and fee income reversed 512    
Residential mortgage, home equity, direct and indirect consumer and commercial financing receivable | Nonperforming Loans      
Financing Receivable, Impaired [Line Items]      
Interest and fee income reversed 44    
Commercial      
Financing Receivable, Impaired [Line Items]      
Lending commitments 402 445  
Commitments in payment default $ 218 $ 207