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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | $ 11 | $ 7 | $ 31 | $ 25
Average Recorded Investment | 1,097 | 1,172 | 1,057 | 1,160
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 3 | 1 | 7 | 3
Average Recorded Investment | 368 | 424 | 351 | 441
Commercial | Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 3 | 1 | 7 | 3
Average Recorded Investment | 334 | 391 | 318 | 402
Commercial | Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | 34 | 33 | 33 | 39
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 | 6 | 24 | 22
Average Recorded Investment | 729 | 748 | 706 | 719
Retail | Residential mortgages |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 0 | 4 | 3
Average Recorded Investment | 154 | 137 | 148 | 128
Retail | Home equity loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 1 | 4 | 4
Average Recorded Investment | 107 | 125 | 107 | 124
Retail | Home equity lines of credit |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 2 | 6 | 5
Average Recorded Investment | 202 | 192 | 189 | 178
Retail | Home equity loans serviced by others |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 0 | 2 | 2
Average Recorded Investment | 43 | 51 | 44 | 51
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 | 23 | 21 | 21 | 18
Retail | Education |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 3 | 3 | 7 | 7
Average Recorded Investment | 160 | 178 | 159 | 178
Retail | Credit cards |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 1 | 1
Average Recorded Investment | 24 | 25 | 22 | 23
Retail | Other retail |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | $ 7 | $ 10 | $ 7 | $ 10

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