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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Additional Impaired Loan Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | $ 10 | $ 9 | $ 20 | $ 18
Average Recorded Investment | 1,104 | 1,259 | 1,069 | 1,231
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 1 | 4 | 2
Average Recorded Investment | 368 | 469 | 343 | 455
Commercial | Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 1 | 4 | 2
Average Recorded Investment | 332 | 431 | 311 | 414
Commercial | Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | 36 | 38 | 32 | 41
Commercial | Leases |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0
Retail |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 8 | 8 | 16 | 16
Average Recorded Investment | 736 | 790 | 726 | 776
Retail | Residential mortgages |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 2 | 3 | 3
Average Recorded Investment | 152 | 182 | 149 | 178
Retail | Home equity loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 1 | 3 | 3
Average Recorded Investment | 112 | 141 | 112 | 140
Retail | Home equity lines of credit |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 1 | 4 | 3
Average Recorded Investment | 198 | 203 | 192 | 197
Retail | Home equity loans serviced by others |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 1 | 1 | 2
Average Recorded Investment | 46 | 54 | 47 | 54
Retail | Home equity lines of credit serviced by others |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | 9 | 9 | 9 | 9
Retail | Automobile |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | 22 | 20 | 21 | 18
Retail | Education |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 2 | 4 | 4
Average Recorded Investment | 165 | 146 | 165 | 146
Retail | Credit cards |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 1 | 1 | 1
Average Recorded Investment | 24 | 25 | 23 | 24
Retail | Other retail |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | $ 8 | $ 10 | $ 8 | $ 10

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