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Loans and ACL - Individually Evaluated for Impairment (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
UPB $ 1,787 $ 1,770
Recorded Investment Without an ALLL 323 322
Recorded Investment With an ALLL 1,360 1,335
Related ALLL 172 171
Average Recorded Investment 1,690 1,807
Interest Income Recognized 69 92
Commercial | Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
UPB 358 381
Recorded Investment Without an ALLL 137 136
Recorded Investment With an ALLL 205 213
Related ALLL 28 28
Average Recorded Investment 354 424
Interest Income Recognized 4 6
Commercial | CRE    
Financing Receivable, Impaired [Line Items]    
UPB 94 91
Recorded Investment Without an ALLL 17 26
Recorded Investment With an ALLL 66 64
Related ALLL 9 6
Average Recorded Investment 94 109
Interest Income Recognized 1 3
Commercial | Lease financing    
Financing Receivable, Impaired [Line Items]    
UPB 7 1
Recorded Investment Without an ALLL 4 0
Recorded Investment With an ALLL 2 1
Related ALLL 0 0
Average Recorded Investment 8 3
Interest Income Recognized 0 0
Retail | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
UPB 889 860
Recorded Investment Without an ALLL 133 132
Recorded Investment With an ALLL 708 679
Related ALLL 65 67
Average Recorded Investment 832 895
Interest Income Recognized 26 37
Retail | Direct    
Financing Receivable, Impaired [Line Items]    
UPB 89 99
Recorded Investment Without an ALLL 26 22
Recorded Investment With an ALLL 43 54
Related ALLL 5 8
Average Recorded Investment 72 78
Interest Income Recognized 3 4
Retail | Indirect    
Financing Receivable, Impaired [Line Items]    
UPB 322 308
Recorded Investment Without an ALLL 6 6
Recorded Investment With an ALLL 308 294
Related ALLL 55 52
Average Recorded Investment 301 269
Interest Income Recognized 34 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 10 10
Average Recorded Investment 29 29
Interest Income Recognized $ 1 $ 1