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Allowances for Loan and Lease Losses (Rollforward of Allowance For Loan and Lease Losses and Associated Loan Data) (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]      
Number of portfolio segments | segment 2    
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance $ 2,629,000,000 $ 2,611,000,000  
Charge-offs (215,000,000) (193,000,000)  
Recoveries 79,000,000 80,000,000  
Net (charge-offs) (136,000,000) (113,000,000)  
Provision for credit losses 189,000,000 92,000,000  
Net decrease / (increase) in allowance for unfunded loan commitments and letters of credit 6,000,000 7,000,000  
Other 4,000,000 7,000,000  
Ending Balance 2,692,000,000 2,604,000,000  
Loans collectively evaluated for impairment - associated allowance 2,200,000,000 2,069,000,000  
Impaired loans - associated allowance 217,000,000   $ 209,000,000
Loans collectively evaluated for impairment 227,528,000,000 216,182,000,000  
Fair value option loans 758,000,000 813,000,000  
Purchased impaired loans 1,949,000,000 2,314,000,000  
Total loans $ 232,293,000,000 [1] $ 221,614,000,000 226,245,000,000 [1]
Portfolio segment ALLL as a percentage of total ALLL 100.00% 100.00%  
Ratio of the allowance for loan and lease losses to total loans 1.16% 1.18%  
TDRs [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance $ 157,000,000 $ 186,000,000  
Loans individually evaluated for impairment 1,868,000,000 1,992,000,000  
Other Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance 60,000,000 67,000,000  
Loans individually evaluated for impairment 190,000,000 313,000,000  
Purchased Impaired Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Impaired loans - associated allowance 275,000,000 282,000,000  
Loans Accounted for under Fair Value Option [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans collectively evaluated for impairment - associated allowance 0    
Total commercial lending [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 1,663,000,000 1,582,000,000  
Charge-offs (31,000,000) (36,000,000)  
Recoveries 19,000,000 26,000,000  
Net (charge-offs) (12,000,000) (10,000,000)  
Provision for credit losses 80,000,000 37,000,000  
Net decrease / (increase) in allowance for unfunded loan commitments and letters of credit 5,000,000 5,000,000  
Ending Balance 1,736,000,000 1,614,000,000  
Loans collectively evaluated for impairment - associated allowance 1,649,000,000 1,513,000,000  
Impaired loans - associated allowance 87,000,000   73,000,000
Loans collectively evaluated for impairment 157,796,000,000 148,248,000,000  
Total loans $ 158,442,000,000 $ 148,945,000,000 152,282,000,000
Portfolio segment ALLL as a percentage of total ALLL 64.00% 62.00%  
Ratio of the allowance for loan and lease losses to total loans 1.10% 1.08%  
Total commercial lending [Member] | TDRs [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance $ 27,000,000 $ 34,000,000  
Loans individually evaluated for impairment 456,000,000 384,000,000  
Total commercial lending [Member] | Other Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance 60,000,000 67,000,000  
Loans individually evaluated for impairment 190,000,000 313,000,000  
Total consumer lending [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 966,000,000 1,029,000,000  
Charge-offs (184,000,000) (157,000,000)  
Recoveries 60,000,000 54,000,000  
Net (charge-offs) (124,000,000) (103,000,000)  
Provision for credit losses 109,000,000 55,000,000  
Net decrease / (increase) in allowance for unfunded loan commitments and letters of credit 1,000,000 2,000,000  
Other 4,000,000 7,000,000  
Ending Balance 956,000,000 990,000,000  
Loans collectively evaluated for impairment - associated allowance 551,000,000 556,000,000  
Impaired loans - associated allowance 130,000,000   136,000,000
Loans collectively evaluated for impairment 69,732,000,000 67,934,000,000  
Fair value option loans 758,000,000 813,000,000  
Purchased impaired loans 1,949,000,000 2,314,000,000  
Total loans $ 73,851,000,000 $ 72,669,000,000 $ 73,963,000,000
Portfolio segment ALLL as a percentage of total ALLL 36.00% 38.00%  
Ratio of the allowance for loan and lease losses to total loans 1.29% 1.36%  
Total consumer lending [Member] | TDRs [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Loans individually evaluated for impairment - associated allowance $ 130,000,000 $ 152,000,000  
Loans individually evaluated for impairment 1,412,000,000 1,608,000,000  
Total consumer lending [Member] | Purchased Impaired Loans [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Impaired loans - associated allowance $ 275,000,000 $ 282,000,000  
[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $.6 billion, Loans of $.8 billion and Other assets of $.1 billion at March 31, 2019 and Loans held for sale of $.9 billion, Loans of $.8 billion and Other assets of $.2 billion at December 31, 2018.