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Loans and ACL - Individually Evaluated for Impairment (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
UPB $ 1,802 $ 1,776
Recorded Investment Without an ALLL 265 278
Recorded Investment With an ALLL 1,438 1,406
Related ALLL 188 175
Average Recorded Investment 1,714 1,694
Interest Income Recognized 22 93
Commercial | Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
UPB 308 318
Recorded Investment Without an ALLL 90 95
Recorded Investment With an ALLL 205 211
Related ALLL 26 25
Average Recorded Investment 308 343
Interest Income Recognized 1 6
Commercial | CRE    
Financing Receivable, Impaired [Line Items]    
UPB 113 102
Recorded Investment Without an ALLL 18 29
Recorded Investment With an ALLL 90 71
Related ALLL 21 9
Average Recorded Investment 112 97
Interest Income Recognized 0 2
Commercial | Lease financing    
Financing Receivable, Impaired [Line Items]    
UPB 2 3
Recorded Investment Without an ALLL 0 0
Recorded Investment With an ALLL 1 3
Related ALLL 0 0
Average Recorded Investment 2 6
Interest Income Recognized 0 0
Retail | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
UPB 927 904
Recorded Investment Without an ALLL 126 122
Recorded Investment With an ALLL 749 732
Related ALLL 66 68
Average Recorded Investment 869 841
Interest Income Recognized 8 34
Retail | Direct    
Financing Receivable, Impaired [Line Items]    
UPB 84 86
Recorded Investment Without an ALLL 26 26
Recorded Investment With an ALLL 40 41
Related ALLL 5 5
Average Recorded Investment 66 72
Interest Income Recognized 1 4
Retail | Indirect    
Financing Receivable, Impaired [Line Items]    
UPB 339 335
Recorded Investment Without an ALLL 5 6
Recorded Investment With an ALLL 324 320
Related ALLL 59 57
Average Recorded Investment 328 306
Interest Income Recognized 12 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 $ 0 $ 1