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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 9 Months Ended
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Number of portfolio segments | segment 2   2    
Beginning Balance     $ 2,611,000,000 $ 2,589,000,000  
Charge-offs     (564,000,000) (577,000,000)  
Recoveries     251,000,000 243,000,000  
Net (charge-offs)     (313,000,000) (334,000,000)  
Provision for credit losses $ 88,000,000 $ 130,000,000 260,000,000 316,000,000  
Net decrease / (increase) in allowance for unfunded loan commitments and letters of credit     9,000,000 8,000,000  
Other     17,000,000 26,000,000  
Ending Balance 2,584,000,000 2,605,000,000 2,584,000,000 2,605,000,000  
Loans collectively evaluated for impairment - associated allowance 2,100,000,000 2,014,000,000 2,100,000,000 2,014,000,000  
Impaired loans - associated allowance 210,000,000   210,000,000   $ 271,000,000
Loans collectively evaluated for impairment 218,106,000,000 215,354,000,000 218,106,000,000 215,354,000,000  
Fair value option loans 753,000,000 807,000,000 753,000,000 807,000,000  
Purchased impaired loans 2,102,000,000 2,557,000,000 2,102,000,000 2,557,000,000  
Total loans $ 223,053,000,000 [1] $ 221,109,000,000 $ 223,053,000,000 [1] $ 221,109,000,000 220,458,000,000 [1]
Portfolio segment ALLL as a percentage of total ALLL 100.00% 100.00% 100.00% 100.00%  
Ratio of the allowance for loan and lease losses to total loans 1.16% 1.18% 1.16% 1.18%  
Loans Accounted for under Fair Value Option [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans collectively evaluated for impairment - associated allowance $ 0   $ 0    
Other Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans individually evaluated for impairment - associated allowance 37,000,000 $ 44,000,000 37,000,000 $ 44,000,000  
Loans individually evaluated for impairment 206,000,000 289,000,000 206,000,000 289,000,000  
TDRs [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans individually evaluated for impairment - associated allowance 173,000,000 243,000,000 173,000,000 243,000,000  
Loans individually evaluated for impairment 1,886,000,000 2,102,000,000 1,886,000,000 2,102,000,000  
Purchased Impaired Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Impaired loans - associated allowance 274,000,000 304,000,000 274,000,000 304,000,000  
Total commercial lending [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance     1,582,000,000 1,534,000,000  
Charge-offs     (92,000,000) (155,000,000)  
Recoveries     74,000,000 86,000,000  
Net (charge-offs)     (18,000,000) (69,000,000)  
Provision for credit losses     48,000,000 153,000,000  
Net decrease / (increase) in allowance for unfunded loan commitments and letters of credit     7,000,000 9,000,000  
Other     (1,000,000) 1,000,000  
Ending Balance 1,618,000,000 1,628,000,000 1,618,000,000 1,628,000,000  
Loans collectively evaluated for impairment - associated allowance 1,553,000,000 1,515,000,000 1,553,000,000 1,515,000,000  
Impaired loans - associated allowance 65,000,000   65,000,000   76,000,000
Loans collectively evaluated for impairment 148,853,000,000 147,751,000,000 148,853,000,000 147,751,000,000  
Purchased impaired loans   58,000,000   58,000,000  
Total loans $ 149,448,000,000 $ 148,527,000,000 $ 149,448,000,000 $ 148,527,000,000 147,439,000,000
Portfolio segment ALLL as a percentage of total ALLL 63.00% 62.00% 63.00% 62.00%  
Ratio of the allowance for loan and lease losses to total loans 1.08% 1.10% 1.08% 1.10%  
Total commercial lending [Member] | Other Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans individually evaluated for impairment - associated allowance $ 37,000,000 $ 44,000,000 $ 37,000,000 $ 44,000,000  
Loans individually evaluated for impairment 206,000,000 289,000,000 206,000,000 289,000,000  
Total commercial lending [Member] | TDRs [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans individually evaluated for impairment - associated allowance 28,000,000 49,000,000 28,000,000 49,000,000  
Loans individually evaluated for impairment 389,000,000 429,000,000 389,000,000 429,000,000  
Total commercial lending [Member] | Purchased Impaired Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Impaired loans - associated allowance   20,000,000   20,000,000  
Total consumer lending [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance     1,029,000,000 1,055,000,000  
Charge-offs     (472,000,000) (422,000,000)  
Recoveries     177,000,000 157,000,000  
Net (charge-offs)     (295,000,000) (265,000,000)  
Provision for credit losses     212,000,000 163,000,000  
Net decrease / (increase) in allowance for unfunded loan commitments and letters of credit     2,000,000 (1,000,000)  
Other     18,000,000 25,000,000  
Ending Balance 966,000,000 977,000,000 966,000,000 977,000,000  
Loans collectively evaluated for impairment - associated allowance 547,000,000 499,000,000 547,000,000 499,000,000  
Impaired loans - associated allowance 145,000,000   145,000,000   195,000,000
Loans collectively evaluated for impairment 69,253,000,000 67,603,000,000 69,253,000,000 67,603,000,000  
Fair value option loans 753,000,000 807,000,000 753,000,000 807,000,000  
Purchased impaired loans 2,102,000,000 2,499,000,000 2,102,000,000 2,499,000,000  
Total loans $ 73,605,000,000 $ 72,582,000,000 $ 73,605,000,000 $ 72,582,000,000 $ 73,019,000,000
Portfolio segment ALLL as a percentage of total ALLL 37.00% 38.00% 37.00% 38.00%  
Ratio of the allowance for loan and lease losses to total loans 1.31% 1.35% 1.31% 1.35%  
Total consumer lending [Member] | TDRs [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans individually evaluated for impairment - associated allowance $ 145,000,000 $ 194,000,000 $ 145,000,000 $ 194,000,000  
Loans individually evaluated for impairment 1,497,000,000 1,673,000,000 1,497,000,000 1,673,000,000  
Total consumer lending [Member] | Purchased Impaired Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Impaired loans - associated allowance $ 274,000,000 $ 284,000,000 $ 274,000,000 $ 284,000,000  
[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.0 billion, Loans of $.8 billion and Other assets of $.2 billion at September 30, 2018 and Loans held for sale of $1.7 billion, Loans of $.9 billion and Other assets of $.3 billion at December 31, 2017.