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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | $ 10 | $ 11 | $ 32 | $ 31
Average Recorded Investment | 1,000 | 1,097 | 926 | 1,057
Commercial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 3 | 8 | 7
Average Recorded Investment | 328 | 368 | 330 | 351
Commercial | Commercial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 3 | 7 | 7
Average Recorded Investment | 293 | 334 | 300 | 318
Commercial | Commercial real estate |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 1 | 0
Average Recorded Investment | 35 | 34 | 30 | 33
Retail |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 8 | 8 | 24 | 24
Average Recorded Investment | 672 | 729 | 596 | 706
Retail | Residential mortgages |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 1 | 4 | 4
Average Recorded Investment | 145 | 154 | 128 | 148
Retail | Home equity loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 1 | 4 | 4
Average Recorded Investment | 94 | 107 | 86 | 107
Retail | Home equity lines of credit |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 2 | 6 | 6
Average Recorded Investment | 199 | 202 | 173 | 189
Retail | Home equity loans serviced by others |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 1 | 2 | 2
Average Recorded Investment | 34 | 43 | 31 | 44
Retail | Home equity lines of credit serviced by others |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | 7 | 9 | 6 | 9
Retail | Automobile |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 1 | 0 | 1 | 0
Average Recorded Investment | 21 | 23 | 18 | 21
Retail | Education |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 2 | 3 | 6 | 7
Average Recorded Investment | 141 | 160 | 128 | 159
Retail | Credit cards |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 1 | 1
Average Recorded Investment | 26 | 24 | 21 | 22
Retail | Other retail |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest Income Recognized | 0 | 0 | 0 | 0
Average Recorded Investment | $ 5 | $ 7 | $ 5 | $ 7

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