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Loans and ACL - Individually Evaluated for Impairment (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
UPB $ 1,798 $ 1,770
Recorded Investment Without an ALLL 309 322
Recorded Investment With an ALLL 1,383 1,335
Related ALLL 180 171
Average Recorded Investment 1,692 1,807
Interest Income Recognized 45 92
Commercial | Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
UPB 350 381
Recorded Investment Without an ALLL 125 136
Recorded Investment With an ALLL 208 213
Related ALLL 33 28
Average Recorded Investment 343 424
Interest Income Recognized 2 6
Commercial | CRE    
Financing Receivable, Impaired [Line Items]    
UPB 108 91
Recorded Investment Without an ALLL 21 26
Recorded Investment With an ALLL 77 64
Related ALLL 10 6
Average Recorded Investment 107 109
Interest Income Recognized 1 3
Commercial | Lease financing    
Financing Receivable, Impaired [Line Items]    
UPB 10 1
Recorded Investment Without an ALLL 0 0
Recorded Investment With an ALLL 9 1
Related ALLL 0 0
Average Recorded Investment 7 3
Interest Income Recognized 0 0
Retail | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
UPB 897 860
Recorded Investment Without an ALLL 133 132
Recorded Investment With an ALLL 716 679
Related ALLL 67 67
Average Recorded Investment 833 895
Interest Income Recognized 18 37
Retail | Direct    
Financing Receivable, Impaired [Line Items]    
UPB 92 99
Recorded Investment Without an ALLL 25 22
Recorded Investment With an ALLL 46 54
Related ALLL 6 8
Average Recorded Investment 74 78
Interest Income Recognized 2 4
Retail | Indirect    
Financing Receivable, Impaired [Line Items]    
UPB 312 308
Recorded Investment Without an ALLL 5 6
Recorded Investment With an ALLL 298 294
Related ALLL 53 52
Average Recorded Investment 299 269
Interest Income Recognized 22 41
Revolving credit    
Financing Receivable, Impaired [Line Items]    
UPB 29 30
Recorded Investment Without an ALLL 0 0
Recorded Investment With an ALLL 29 30
Related ALLL 11 10
Average Recorded Investment 29 29
Interest Income Recognized $ 0 $ 1