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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | $ 42 | $ 41 | $ 35
Average Recorded Investment | 936 | 1,031 | 1,130
Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 12 | 10 | 4
Average Recorded Investment | 350 | 344 | 417
Commercial | Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 11 | 9 | 4
Average Recorded Investment | 311 | 312 | 380
Commercial | Commercial real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 1 | 1 | 0
Average Recorded Investment | 39 | 32 | 37
Retail |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 30 | 31 | 31
Average Recorded Investment | 586 | 687 | 713
Retail | Residential mortgages |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 5 | 5 | 4
Average Recorded Investment | 126 | 146 | 136
Retail | Home equity loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 5 | 6 | 6
Average Recorded Investment | 84 | 107 | 121
Retail | Home equity lines of credit |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 7 | 7 | 6
Average Recorded Investment | 172 | 181 | 176
Retail | Home equity loans serviced by others |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 2 | 3 | 3
Average Recorded Investment | 30 | 42 | 49
Retail | Home equity lines of credit serviced by others |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 0 | 0 | 0
Average Recorded Investment | 6 | 9 | 9
Retail | Automobile |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 1 | 1 | 1
Average Recorded Investment | 17 | 20 | 18
Retail | Education |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 8 | 8 | 9
Average Recorded Investment | 125 | 154 | 173
Retail | Credit cards |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 2 | 1 | 2
Average Recorded Investment | 21 | 21 | 22
Retail | Other retail |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Interest Income Recognized | 0 | 0 | 0
Average Recorded Investment | $ 5 | $ 7 | $ 9

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