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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 1,190 | $ 1,456
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 450 | 501
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 142 | 163
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 598 | 792
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 223 | 366
Commercial | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 143 | 273
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 80 | 88
Commercial | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 5
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 92 | 68
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 46 | 26
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 46 | 38
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 4
Commercial | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 10 | 25
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3 | 4
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7 | 20
Commercial | Financing Receivables 60 To 89 Days Past Due | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 1
Commercial | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 121 | 273
Commercial | Financing Receivables 90 Days or More Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 94 | 243
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 27 | 30
Commercial | Financing Receivables 90 Days or More Past Due | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 0
Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 967 | 1,090
Retail | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 184 | 184
Retail | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 53 | 78
Retail | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 266 | 289
Retail | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 23 | 36
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 10 | 12
Retail | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 297 | 335
Retail | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 47 | 76
Retail | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 40 | 38
Retail | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 47 | 42
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 358 | 433
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 | 11 | 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 | 55 | 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 | 6 | 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 | 189 | 220
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 24 | 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 | 20 | 20
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 132 | 138
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 | 25 | 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 | 2 | 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 | 51 | 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 | 9 | 9
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15 | 12
Retail | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 477 | 519
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 134 | 120
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 39 | 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 | 186 | 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 | 15 | 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 | 57 | 60
Retail | Financing Receivables 90 Days or More Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 10 | 41
Retail | Financing Receivables 90 Days or More Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 17 | 17
Retail | Financing Receivables 90 Days or More Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 12 | $ 10

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