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Loans (Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance $ 2,742 $ 2,629
Charge-offs (304) (215)
Recoveries 92 79
Net (charge-offs) (212) (136)
Provision for credit losses 952 189
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit   6
Other   4
Loans collectively evaluated for impairment - associated allowance   2,200
Ending balance 3,944 2,692
Loans collectively evaluated for impairment   227,528
Fair value option loans   758
Purchased impaired loans   1,949
Total loans   $ 232,293
Portfolio segment ALLL as a percentage of total ALLL   100.00%
Ratio of the allowance for loan and lease losses to total loans   1.16%
TDRs [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Loans individually evaluated for impairment - associated allowance   $ 157
Loans individually evaluated for impairment   1,868
Other Loans [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Loans individually evaluated for impairment - associated allowance   60
Loans individually evaluated for impairment   190
Purchased Impaired Loans [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Impaired loans - associated allowance   275
Total commercial lending    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 1,812 1,663
Charge-offs (83) (31)
Recoveries 24 19
Net (charge-offs) (59) (12)
Provision for credit losses 531 80
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit   5
Loans collectively evaluated for impairment - associated allowance   1,649
Ending balance 1,979 1,736
Loans collectively evaluated for impairment   157,796
Total loans   $ 158,442
Portfolio segment ALLL as a percentage of total ALLL   64.00%
Ratio of the allowance for loan and lease losses to total loans   1.10%
Total commercial lending | TDRs [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Loans individually evaluated for impairment - associated allowance   $ 27
Loans individually evaluated for impairment   456
Total commercial lending | Other Loans [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Loans individually evaluated for impairment - associated allowance   60
Loans individually evaluated for impairment   190
Total consumer lending    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 930 966
Charge-offs (221) (184)
Recoveries 68 60
Net (charge-offs) (153) (124)
Provision for credit losses 421 109
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit   1
Other   4
Loans collectively evaluated for impairment - associated allowance   551
Ending balance $ 1,965 956
Loans collectively evaluated for impairment   69,732
Fair value option loans   758
Purchased impaired loans   1,949
Total loans   $ 73,851
Portfolio segment ALLL as a percentage of total ALLL   36.00%
Ratio of the allowance for loan and lease losses to total loans   1.29%
Total consumer lending | TDRs [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Loans individually evaluated for impairment - associated allowance   $ 130
Loans individually evaluated for impairment   1,412
Total consumer lending | Purchased Impaired Loans [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Impaired loans - associated allowance   $ 275