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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, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 511 | $ 493
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 212 | 177
Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 419 | 587
Financing Receivables, Equal To Or Greater Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,142 | 1,257
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 83 | 100
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 45 | 85
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 8
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 37 | 7
Commercial | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 28 | 35
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 27 | 3
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 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 | 69 | 83
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 67 | 78
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 5
Commercial | Financing Receivables, 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2 | 0
Commercial | Financing Receivables, Equal To Or Greater Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 180 | 218
Commercial | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 139 | 166
Commercial | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2 | 45
Commercial | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 39 | 7
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 428 | 393
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 35 | 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 | 72 | 65
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7 | 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 | 227 | 207
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 30 | 23
Retail | Financing Receivables, 30 to 59 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 15 | 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 | 184 | 142
Retail | Financing Receivables, 60 to 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 17 | 13
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4 | 3
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 32 | 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 | 81 | 59
Retail | Financing Receivables, 60 to 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 15 | 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 | 20 | 18
Retail | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 350 | 504
Retail | Financing Receivables, 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 84 | 133
Retail | Financing Receivables, 90 Days or More Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 21 | 38
Retail | Financing Receivables, 90 Days or More Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 146 | 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 | 10 | 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 | 12 | 11
Retail | Financing Receivables, 90 Days or More Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 22 | 20
Retail | Financing Receivables, 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 19 | 15
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 962 | 1,039
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 136 | 183
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 35 | 53
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 250 | 282
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 22 | 23
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 13 | 10
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 332 | 338
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 57 | 47
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 48 | 44
Retail | Financing Receivables, Equal To Or Greater Than 30 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 69 | $ 59

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