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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 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 1,036 | $ 1,257
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 392 | 493
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 188 | 177
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 456 | 587
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 90 | 218
Commercial | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 80 | 166
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8 | 45
Commercial | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2 | 7
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 13 | 100
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 12 | 85
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 8
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1 | 7
Commercial | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 23 | 35
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 17 | 3
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 6 | 32
Commercial | Financing Receivables 60 To 89 Days Past Due | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 0
Commercial | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 54 | 83
Commercial | Financing Receivables 90 Days or More Past Due | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 51 | 78
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2 | 5
Commercial | Financing Receivables 90 Days or More Past Due | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1 | 0
Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 946 | 1,039
Retail | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 181 | 183
Retail | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 40 | 53
Retail | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 242 | 282
Retail | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 21 | 23
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 14 | 10
Retail | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 287 | 338
Retail | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 50 | 47
Retail | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 44 | 44
Retail | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 67 | 59
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 379 | 393
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 32 | 37
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 11 | 12
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 58 | 65
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 | 5 | 7
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 | 2
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 201 | 207
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 25 | 23
Retail | Financing Receivables, 30 to 59 Days Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15 | 14
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 30 | 26
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 165 | 142
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15 | 13
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 5 | 3
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 31 | 22
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 | 3
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 | 67 | 59
Retail | Financing Receivables 60 To 89 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 13 | 13
Retail | Financing Receivables 60 To 89 Days Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 9 | 10
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 21 | 18
Retail | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 402 | 504
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 134 | 133
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 24 | 38
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 153 | 195
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 | 13
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 | 11 | 7
Retail | Financing Receivables 90 Days or More Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 19 | 72
Retail | Financing Receivables 90 Days or More Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 12 | 11
Retail | Financing Receivables 90 Days or More Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 20 | 20
Retail | Financing Receivables 90 Days or More Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 16 | $ 15

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