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Loans and ACL - Individually Evaluated for Impairment (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
UPB $ 1,655 $ 1,776
Recorded Investment Without an ALLL 231 278
Recorded Investment With an ALLL 1,331 1,406
Related ALLL 165 175
Average Recorded Investment 1,692 1,694
Interest Income Recognized 52 93
Commercial | Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
UPB 321 318
Recorded Investment Without an ALLL 89 95
Recorded Investment With an ALLL 221 211
Related ALLL 28 25
Average Recorded Investment 309 343
Interest Income Recognized 3 6
Commercial | CRE    
Financing Receivable, Impaired [Line Items]    
UPB 62 102
Recorded Investment Without an ALLL 5 29
Recorded Investment With an ALLL 50 71
Related ALLL 4 9
Average Recorded Investment 100 97
Interest Income Recognized 1 2
Commercial | Lease financing    
Financing Receivable, Impaired [Line Items]    
UPB 2 3
Recorded Investment Without an ALLL 0 0
Recorded Investment With an ALLL 2 3
Related ALLL 0 0
Average Recorded Investment 2 6
Interest Income Recognized 0 0
Retail | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
UPB 813 904
Recorded Investment Without an ALLL 106 122
Recorded Investment With an ALLL 659 732
Related ALLL 56 68
Average Recorded Investment 858 841
Interest Income Recognized 19 34
Retail | Direct    
Financing Receivable, Impaired [Line Items]    
UPB 82 86
Recorded Investment Without an ALLL 26 26
Recorded Investment With an ALLL 39 41
Related ALLL 5 5
Average Recorded Investment 66 72
Interest Income Recognized 2 4
Retail | Indirect    
Financing Receivable, Impaired [Line Items]    
UPB 346 335
Recorded Investment Without an ALLL 5 6
Recorded Investment With an ALLL 331 320
Related ALLL 61 57
Average Recorded Investment 328 306
Interest Income Recognized 26 46
Revolving credit    
Financing Receivable, Impaired [Line Items]    
UPB 29 28
Recorded Investment Without an ALLL 0 0
Recorded Investment With an ALLL 29 28
Related ALLL 11 11
Average Recorded Investment 29 29
Interest Income Recognized $ 1 $ 1