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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Recorded Investment in Retail Loans by Delinquency Status (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 1,257 | $ 1,456
Total loans and leases | 116,660 | 110,617
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 493 | 501
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 177 | 163
Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 587 | 792
Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 59,877 | 58,586
Retail | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 18,664 | 16,714
Past Due | 183 | 184
Total loans and leases | 18,978 | 17,045
Retail | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 945 | 1,212
Past Due | 53 | 78
Total loans and leases | 1,073 | 1,392
Retail | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 12,042 | 12,756
Past Due | 282 | 289
Total loans and leases | 12,710 | 13,483
Retail | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 355 | 477
Past Due | 23 | 36
Total loans and leases | 399 | 542
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 79 | 116
Past Due | 10 | 12
Total loans and leases | 104 | 149
Retail | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 10,729 | 11,596
Past Due | 338 | 335
Total loans and leases | 12,106 | 13,204
Retail | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 8,694 | 7,898
Past Due | 47 | 76
Total loans and leases | 8,900 | 8,134
Retail | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,894 | 1,747
Past Due | 44 | 38
Total loans and leases | 1,991 | 1,848
Retail | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 3,481 | 2,679
Past Due | 59 | 42
Total loans and leases | 3,616 | 2,789
Retail | Total retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 56,883 | 55,195
Total loans and leases | 59,877 | 58,586
Retail | Financing Receivables, 1 to 29 Days Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 131 | 147
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 75 | 102
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 386 | 438
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 21 | 29
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15 | 21
Retail | Financing Receivables, 1 to 29 Days Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,039 | 1,273
Retail | Financing Receivables, 1 to 29 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 159 | 160
Retail | Financing Receivables, 1 to 29 Days Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 53 | 63
Retail | Financing Receivables, 1 to 29 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 76 | 68
Retail | Financing Receivables, 1 to 29 Days Past Due | Total retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,955 | 2,301
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 37 | 46
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 12 | 20
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 65 | 78
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7 | 10
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2 | 4
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 207 | 220
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 23 | 23
Retail | Financing Receivables, 30 to 59 Days Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 14 | 12
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 26 | 20
Retail | Financing Receivables, 30 to 59 Days Past Due | Total retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 393 | 433
Retail | Financing Receivables, 60 to 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 13 | 18
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3 | 4
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 22 | 23
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3 | 4
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1 | 1
Retail | Financing Receivables, 60 to 89 Days Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 59 | 55
Retail | Financing Receivables, 60 to 89 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 13 | 12
Retail | Financing Receivables, 60 to 89 Days Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 10 | 9
Retail | Financing Receivables, 60 to 89 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 18 | 12
Retail | Financing Receivables, 60 to 89 Days Past Due | Total retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 142 | 138
Retail | Financing Receivables, 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 133 | 120
Retail | Financing Receivables, 90 Days or More Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 38 | 54
Retail | Financing Receivables, 90 Days or More Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 195 | 188
Retail | Financing Receivables, 90 Days or More Past Due | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 13 | 22
Retail | Financing Receivables, 90 Days or More Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7 | 7
Retail | Financing Receivables, 90 Days or More Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 72 | 60
Retail | Financing Receivables, 90 Days or More Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 11 | 41
Retail | Financing Receivables, 90 Days or More Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 20 | 17
Retail | Financing Receivables, 90 Days or More Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15 | 10
Retail | Financing Receivables, 90 Days or More Past Due | Total retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 504 | $ 519

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