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Allowances for Loan and Lease Losses (Rollforward of Allowance For Loan and Lease Losses and Associated Loan Data) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance $ 2,611,000,000 $ 2,589,000,000 $ 2,727,000,000
Charge-offs (764,000,000) (786,000,000) (886,000,000)
Recoveries 344,000,000 329,000,000 343,000,000
Net charge-offs (420,000,000) (457,000,000) (543,000,000)
Provision for credit losses 408,000,000 441,000,000 433,000,000
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit 12,000,000 4,000,000 (40,000,000)
Other 18,000,000 34,000,000 12,000,000
Ending Balance 2,629,000,000 2,611,000,000 2,589,000,000
Loans collectively evaluated for impairment - associated allowance 2,145,000,000 2,067,000,000 1,938,000,000
Impaired loans - associated allowance 209,000,000 271,000,000  
Loans collectively evaluated for impairment 221,363,000,000 214,822,000,000 204,392,000,000
Fair value option loans 782,000,000 869,000,000 893,000,000
Purchased impaired loans 2,017,000,000 2,396,000,000 2,956,000,000
Total Loans $ 226,245,000,000 [1] $ 220,458,000,000 [1] $ 210,833,000,000
Portfolio segment ALLL as a percentage of total ALLL 100.00% 100.00% 100.00%
Ratio of ALLL to total loans 1.16% 1.18% 1.23%
Loans Accounted for under Fair Value Option      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans collectively evaluated for impairment - associated allowance $ 0 $ 0 $ 0
TDRs      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment - associated allowance 161,000,000 230,000,000 271,000,000
Loans individually evaluated for impairment 1,851,000,000 2,061,000,000 2,221,000,000
Other Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment - associated allowance 48,000,000 41,000,000 60,000,000
Loans individually evaluated for impairment 232,000,000 310,000,000 371,000,000
Purchased Impaired Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Impaired loans - associated allowance 275,000,000 273,000,000 320,000,000
Total commercial lending      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 1,582,000,000 1,534,000,000 1,605,000,000
Charge-offs (124,000,000) (221,000,000) (363,000,000)
Recoveries 99,000,000 116,000,000 178,000,000
Net charge-offs (25,000,000) (105,000,000) (185,000,000)
Provision for credit losses 97,000,000 147,000,000 153,000,000
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit 11,000,000 5,000,000 (39,000,000)
Other (2,000,000) 1,000,000  
Ending Balance 1,663,000,000 1,582,000,000 1,534,000,000
Loans collectively evaluated for impairment - associated allowance 1,590,000,000 1,506,000,000 1,392,000,000
Impaired loans - associated allowance 73,000,000 76,000,000  
Loans collectively evaluated for impairment 151,641,000,000 146,720,000,000 137,047,000,000
Purchased impaired loans     109,000,000
Total Loans $ 152,282,000,000 $ 147,439,000,000 $ 137,955,000,000
Portfolio segment ALLL as a percentage of total ALLL 63.00% 61.00% 59.00%
Ratio of ALLL to total loans 1.09% 1.07% 1.11%
Total commercial lending | TDRs      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment - associated allowance $ 25,000,000 $ 35,000,000 $ 45,000,000
Loans individually evaluated for impairment 409,000,000 409,000,000 428,000,000
Total commercial lending | Other Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment - associated allowance 48,000,000 41,000,000 60,000,000
Loans individually evaluated for impairment 232,000,000 310,000,000 371,000,000
Total commercial lending | Purchased Impaired Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Impaired loans - associated allowance     37,000,000
Total consumer lending      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 1,029,000,000 1,055,000,000 1,122,000,000
Charge-offs (640,000,000) (565,000,000) (523,000,000)
Recoveries 245,000,000 213,000,000 165,000,000
Net charge-offs (395,000,000) (352,000,000) (358,000,000)
Provision for credit losses 311,000,000 294,000,000 280,000,000
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit 1,000,000 (1,000,000) (1,000,000)
Other 20,000,000 33,000,000 12,000,000
Ending Balance 966,000,000 1,029,000,000 1,055,000,000
Loans collectively evaluated for impairment - associated allowance 555,000,000 561,000,000 546,000,000
Impaired loans - associated allowance 136,000,000 195,000,000  
Loans collectively evaluated for impairment 69,722,000,000 68,102,000,000 67,345,000,000
Fair value option loans 782,000,000 869,000,000 893,000,000
Purchased impaired loans 2,017,000,000 2,396,000,000 2,847,000,000
Total Loans $ 73,963,000,000 $ 73,019,000,000 $ 72,878,000,000
Portfolio segment ALLL as a percentage of total ALLL 37.00% 39.00% 41.00%
Ratio of ALLL to total loans 1.31% 1.41% 1.45%
Total consumer lending | TDRs      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment - associated allowance $ 136,000,000 $ 195,000,000 $ 226,000,000
Loans individually evaluated for impairment 1,442,000,000 1,652,000,000 1,793,000,000
Total consumer lending | Purchased Impaired Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Impaired loans - associated allowance $ 275,000,000 $ 273,000,000 $ 283,000,000
[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $.9 billion, Loans of $.8 billion, and Other assets of $.2 billion at December 31, 2018 and Loans held for sale of $1.7 billion, Loans of $.9 billion, and Other assets of $.3 billion at December 31, 2017.