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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | $ 11 | $ 10 | $ 22 | $ 20
Average Recorded Investment | 1,019 | 1,104 | 1,003 | 1,069
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 3 | 2 | 6 | 4
Average Recorded Investment | 337 | 368 | 331 | 343
Commercial | Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 2 | 5 | 4
Average Recorded Investment | 310 | 332 | 304 | 311
Commercial | Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 0 | 1 | 0
Average Recorded Investment | 27 | 36 | 27 | 32
Retail |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 8 | 8 | 16 | 16
Average Recorded Investment | 682 | 736 | 672 | 726
Retail | Residential mortgages |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 2 | 3 | 3
Average Recorded Investment | 145 | 152 | 142 | 149
Retail | Home equity loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 1 | 3 | 3
Average Recorded Investment | 97 | 112 | 97 | 112
Retail | Home equity lines of credit |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 2 | 4 | 4
Average Recorded Investment | 199 | 198 | 193 | 192
Retail | Home equity loans serviced by others |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 1 | 1
Average Recorded Investment | 36 | 46 | 37 | 47
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 | 7 | 9 | 7 | 9
Retail | Automobile |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | 22 | 22 | 21 | 21
Retail | Education |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 2 | 4 | 4
Average Recorded Investment | 145 | 165 | 145 | 165
Retail | Credit cards |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 1 | 1 | 1
Average Recorded Investment | 25 | 24 | 24 | 23
Retail | Other retail |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | $ 6 | $ 8 | $ 6 | $ 8

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