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Loans and Allowance for Credit Losses, Nonaccrual (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Nonaccrual Loans [Abstract]    
Nonaccrual loans $ 8,728  
Nonaccrual loans without related allowance for credit losses 2,875  
Recognized interest income 341  
Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   $ 5,346
Total Commercial [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 4,779 2,254
Nonaccrual loans without related allowance for credit losses 506  
Recognized interest income 115  
Total Commercial [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   2,254
Commercial and industrial loans [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 2,698 1,545
Nonaccrual loans without related allowance for credit losses 382  
Recognized interest income 78  
Commercial and industrial loans [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   1,545
Commercial real estate mortgage [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 1,774 573
Nonaccrual loans without related allowance for credit losses 93  
Recognized interest income 31  
Commercial real estate mortgage [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   573
Commercial real estate construction [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 48 41
Nonaccrual loans without related allowance for credit losses 15  
Recognized interest income 6  
Commercial real estate construction [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   41
Lease financing [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 259 95
Nonaccrual loans without related allowance for credit losses 16  
Recognized interest income 0  
Lease financing [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   95
Total Consumer [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 3,949  
Nonaccrual loans without related allowance for credit losses 2,369  
Recognized interest income 226  
Total Consumer [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   3,092
Residential mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans in process of foreclosure, amount 2,100 3,500
Real estate 1-4 family first mortgage [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 2,957  
Nonaccrual loans without related allowance for credit losses 1,908  
Recognized interest income 151  
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   2,150
Real estate 1-4 family junior lien mortgage [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 754  
Nonaccrual loans without related allowance for credit losses 461  
Recognized interest income 52  
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   796
Auto [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 202  
Nonaccrual loans without related allowance for credit losses 0  
Recognized interest income 20  
Auto [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   106
Other revolving credit and installment [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans 36  
Nonaccrual loans without related allowance for credit losses 0  
Recognized interest income 3  
Other revolving credit and installment [Member] | Not purchased credit deteriorated [Member]    
Nonaccrual Loans [Abstract]    
Nonaccrual loans   40
Government guaranteed mortgage loans upon foreclosure receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans in process of foreclosure, amount $ 1,700 $ 2,800