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Loans and ACL - Individually Evaluated for Impairment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
UPB $ 1,776 $ 1,770
Recorded Investment Without an ALLL 278 322
Recorded Investment With an ALLL 1,406 1,335
Related ALLL 175 171
Average Recorded Investment 1,694 1,807
Interest Income Recognized 93 92
Commercial | Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
UPB 318 381
Recorded Investment Without an ALLL 95 136
Recorded Investment With an ALLL 211 213
Related ALLL 25 28
Average Recorded Investment 343 424
Interest Income Recognized 6 6
Commercial | CRE    
Financing Receivable, Impaired [Line Items]    
UPB 102 91
Recorded Investment Without an ALLL 29 26
Recorded Investment With an ALLL 71 64
Related ALLL 9 6
Average Recorded Investment 97 109
Interest Income Recognized 2 3
Commercial | Lease financing    
Financing Receivable, Impaired [Line Items]    
UPB 3 1
Recorded Investment Without an ALLL 0 0
Recorded Investment With an ALLL 3 1
Related ALLL 0 0
Average Recorded Investment 6 3
Interest Income Recognized 0 0
Retail | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
UPB 904 860
Recorded Investment Without an ALLL 122 132
Recorded Investment With an ALLL 732 679
Related ALLL 68 67
Average Recorded Investment 841 895
Interest Income Recognized 34 37
Retail | Direct    
Financing Receivable, Impaired [Line Items]    
UPB 86 99
Recorded Investment Without an ALLL 26 22
Recorded Investment With an ALLL 41 54
Related ALLL 5 8
Average Recorded Investment 72 78
Interest Income Recognized 4 4
Retail | Indirect    
Financing Receivable, Impaired [Line Items]    
UPB 335 308
Recorded Investment Without an ALLL 6 6
Recorded Investment With an ALLL 320 294
Related ALLL 57 52
Average Recorded Investment 306 269
Interest Income Recognized 46 41
Revolving credit    
Financing Receivable, Impaired [Line Items]    
UPB 28 30
Recorded Investment Without an ALLL 0 0
Recorded Investment With an ALLL 28 30
Related ALLL 11 10
Average Recorded Investment 29 29
Interest Income Recognized $ 1 $ 1