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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Default of Modified Debt Agreements (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract | Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 260 | 279 | 781 | 832
Balance Defaulted | $ | $ 42 | $ 14 | $ 82 | $ 40
Commercial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 9 | 2 | 16 | 8
Balance Defaulted | $ | $ 32 | $ 4 | $ 52 | $ 9
Commercial | Commercial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 9 | 2 | 15 | 7
Balance Defaulted | $ | $ 32 | $ 4 | $ 52 | $ 5
Commercial | Commercial real estate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 1 | 1
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 4
Retail |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 251 | 277 | 765 | 824
Balance Defaulted | $ | $ 10 | $ 10 | $ 30 | $ 31
Retail | Residential mortgages |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 33 | 35 | 103 | 121
Balance Defaulted | $ | $ 4 | $ 5 | $ 12 | $ 15
Retail | Home equity loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 6 | 12 | 24 | 35
Balance Defaulted | $ | $ 0 | $ 0 | $ 1 | $ 1
Retail | Home equity lines of credit |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 59 | 55 | 165 | 152
Balance Defaulted | $ | $ 5 | $ 4 | $ 13 | $ 11
Retail | Home equity loans serviced by others |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 3 | 6 | 13 | 16
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Home equity lines of credit serviced by others |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 2 | 4 | 3 | 8
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Automobile |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 40 | 42 | 116 | 103
Balance Defaulted | $ | $ 0 | $ 0 | $ 1 | $ 1
Retail | Education |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 1 | 5 | 13 | 41
Balance Defaulted | $ | $ 0 | $ 1 | $ 1 | $ 1
Retail | Credit cards |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 106 | 116 | 327 | 344
Balance Defaulted | $ | $ 1 | $ 0 | $ 2 | $ 2
Retail | Other retail |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 1 | 2 | 1 | 4
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 0

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