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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Additional Impaired Loan Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | $ 41 | $ 35 | $ 35
Average Recorded Investment | 1,031 | 1,130 | 1,102
Commercial | Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 10 | 4 | 5
Average Recorded Investment | 344 | 417 | 351
Commercial | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 9 | 4 | 5
Average Recorded Investment | 312 | 380 | 295
Commercial | Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 1 | 0 | 0
Average Recorded Investment | 32 | 37 | 53
Commercial | Leases |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 3
Retail | Retail |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 31 | 31 | 30
Average Recorded Investment | 687 | 713 | 751
Retail | Residential mortgages |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 5 | 4 | 4
Average Recorded Investment | 146 | 136 | 161
Retail | Home equity loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 6 | 6 | 7
Average Recorded Investment | 107 | 121 | 144
Retail | Home equity lines of credit |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 7 | 6 | 6
Average Recorded Investment | 181 | 176 | 178
Retail | Home equity loans serviced by others |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 3 | 3 | 3
Average Recorded Investment | 42 | 49 | 60
Retail | Home equity lines of credit serviced by others |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 0 | 0 | 0
Average Recorded Investment | 9 | 9 | 9
Retail | Automobile |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 1 | 1 | 0
Average Recorded Investment | 20 | 18 | 14
Retail | Education |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 8 | 9 | 7
Average Recorded Investment | 154 | 173 | 150
Retail | Credit cards |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 1 | 2 | 2
Average Recorded Investment | 21 | 22 | 23
Retail | Other retail |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Interest Income Recognized | 0 | 0 | 1
Average Recorded Investment | $ 7 | $ 9 | $ 12

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