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Loans and Allowance for Credit Losses, Impaired Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Trial modifications $ 14,500 $ 11,800
Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   14,670
Impaired loans   13,030
Impaired loans with related allowance for credit losses    8,927
Related allowance for credit losses    1,314
Total Commercial [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   4,141
Impaired loans   3,133
Impaired loans with related allowance for credit losses    2,852
Related allowance for credit losses    467
Commercial and industrial loans [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   2,792
Impaired loans   2,003
Impaired loans with related allowance for credit losses    1,903
Related allowance for credit losses    311
Commercial real estate mortgage [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   1,137
Impaired loans   974
Impaired loans with related allowance for credit losses    803
Related allowance for credit losses    110
Commercial real estate construction [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   81
Impaired loans   51
Impaired loans with related allowance for credit losses    41
Related allowance for credit losses    11
Lease financing [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   131
Impaired loans   105
Impaired loans with related allowance for credit losses    105
Related allowance for credit losses    35
Total Consumer [Member] | Trial modifications [Member]    
Financing Receivable, Impaired [Line Items]    
Trial modifications   115
Total Consumer [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   10,529
Impaired loans   9,897
Impaired loans with related allowance for credit losses    6,075
Related allowance for credit losses    847
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]    
Impaired Loans [Abstract]    
Impaired loans   1,200
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   8,107
Impaired loans   7,674
Impaired loans with related allowance for credit losses    4,433
Related allowance for credit losses    437
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   1,586
Impaired loans   1,451
Impaired loans with related allowance for credit losses    925
Related allowance for credit losses    144
Credit card [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   520
Impaired loans   520
Impaired loans with related allowance for credit losses    520
Related allowance for credit losses    209
Auto [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   138
Impaired loans   81
Impaired loans with related allowance for credit losses    42
Related allowance for credit losses    8
Other revolving credit and installment [Member] | Not purchased credit deteriorated [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance   178
Impaired loans   171
Impaired loans with related allowance for credit losses    155
Related allowance for credit losses    $ 49