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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 5,928 $ 2,742 $ 2,629
Charge-offs (247) (865) (683)
Recoveries 92 262 250
Net (charge-offs) (155) (603) (433)
Provision for credit losses (23) 3,149 552
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit     (19)
Other     9
Loans collectively evaluated for impairment - associated allowance     2,284
Ending balance 5,751 5,751 2,738
Loans collectively evaluated for impairment     232,801
Fair value option loans     754
Purchased impaired loans     1,794
Total loans     237,377
TDRs [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance     129
Loans individually evaluated for impairment     1,763
Other Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance     47
Loans individually evaluated for impairment     265
Purchased Impaired Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Impaired loans - associated allowance     278
Total commercial      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 3,380 1,812 1,663
Charge-offs (64) (269) (138)
Recoveries 26 65 59
Net (charge-offs) (38) (204) (79)
Provision for credit losses 185 2,224 247
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit     (20)
Other    
Loans collectively evaluated for impairment - associated allowance     1,730
Ending balance 3,528 3,528 1,811
Loans collectively evaluated for impairment     159,503
Purchased impaired loans    
Total loans     160,188
Total commercial | TDRs [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance     34
Loans individually evaluated for impairment     420
Total commercial | Other Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance     47
Loans individually evaluated for impairment     265
Total commercial | Purchased Impaired Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Impaired loans - associated allowance    
Total consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 2,548 930 966
Charge-offs (183) (596) (545)
Recoveries 66 197 191
Net (charge-offs) (117) (399) (354)
Provision for credit losses (208) 925 305
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit     1
Other     9
Loans collectively evaluated for impairment - associated allowance     554
Ending balance $ 2,223 $ 2,223 927
Loans collectively evaluated for impairment     73,298
Fair value option loans     754
Purchased impaired loans     1,794
Total loans     77,189
Total consumer | TDRs [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance     95
Loans individually evaluated for impairment     1,343
Total consumer | Purchased Impaired Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Impaired loans - associated allowance     $ 278