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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, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 392 | $ 493
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 273 | 177
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 418 | 587
Financing Receivables, 30 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,083 | 1,257
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 24 | 100
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 17 | 85
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7 | 8
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 7
Commercial | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 20 | 35
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4 | 3
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 16 | 32
Commercial | Financing Receivables 60 To 89 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Commercial | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 78 | 83
Commercial | Financing Receivables 90 Days or More Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 76 | 78
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 5
Commercial | Financing Receivables 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 0
Commercial | Financing Receivables, 30 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 122 | 218
Commercial | Financing Receivables, 30 Days or More Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 97 | 166
Commercial | Financing Receivables, 30 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 24 | 45
Commercial | Financing Receivables, 30 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 7
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 368 | 393
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 28 | 37
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 10 | 12
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 52 | 65
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, 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, Past Due [Line Items] |  |
Past Due | 2 | 2
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 194 | 207
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 27 | 23
Retail | Financing Receivables, 30 to 59 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 20 | 14
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 30 | 26
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 253 | 142
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 78 | 13
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 25 | 3
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 27 | 22
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, 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, Past Due [Line Items] |  |
Past Due | 1 | 1
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 71 | 59
Retail | Financing Receivables 60 To 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 16 | 13
Retail | Financing Receivables 60 To 89 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 11 | 10
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 21 | 18
Retail | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 340 | 504
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 89 | 133
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7 | 38
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 145 | 195
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 12 | 13
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 11 | 7
Retail | Financing Receivables 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 24 | 72
Retail | Financing Receivables 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 11 | 11
Retail | Financing Receivables 90 Days or More Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 21 | 20
Retail | Financing Receivables 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 20 | 15
Retail | Financing Receivables, 30 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 961 | 1,039
Retail | Financing Receivables, 30 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 195 | 183
Retail | Financing Receivables, 30 Days or More Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 42 | 53
Retail | Financing Receivables, 30 Days or More Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 224 | 282
Retail | Financing Receivables, 30 Days or More Past Due | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 20 | 23
Retail | Financing Receivables, 30 Days or More Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 14 | 10
Retail | Financing Receivables, 30 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 289 | 338
Retail | Financing Receivables, 30 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 54 | 47
Retail | Financing Receivables, 30 Days or More Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 52 | 44
Retail | Financing Receivables, 30 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 71 | $ 59

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