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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 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 1,257 | $ 1,456
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
Commercial | Commercial Banking |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 218 | 366
Commercial | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 166 | 273
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 45 | 88
Commercial | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7 | 5
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial Banking |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 100 | 68
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 85 | 26
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8 | 38
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7 | 4
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial Banking |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 35 | 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 | 32 | 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 | Commercial Banking |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 83 | 273
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 78 | 243
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 5 | 30
Commercial | Financing Receivables, 90 Days or More Past Due | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 0
Retail | Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,039 | 1,090
Retail | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 183 | 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 | 282 | 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 | 338 | 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 | 44 | 38
Retail | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 59 | 42
Retail | Financing Receivables, 30 to 59 Days Past Due | Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 393 | 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 | 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, 60 to 89 Days Past Due | Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 142 | 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 | 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, 90 Days or More Past Due | Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 504 | 519
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

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