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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Impaired Loans by Class (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | $ 482 | $ 483
Allowance on Impaired Loans | 99 | 64
Impaired Loans Without a Related Allowance | 580 | 631
Unpaid Contractual Balance | 1,271 | 1,363
Total Recorded Investment in Impaired Loans | 1,062 | 1,114
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 241 | 218
Allowance on Impaired Loans | 74 | 38
Impaired Loans Without a Related Allowance | 146 | 173
Unpaid Contractual Balance | 452 | 488
Total Recorded Investment in Impaired Loans | 387 | 391
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 194 | 186
Allowance on Impaired Loans | 62 | 31
Impaired Loans Without a Related Allowance | 127 | 167
Unpaid Contractual Balance | 376 | 450
Total Recorded Investment in Impaired Loans | 321 | 353
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 47 | 32
Allowance on Impaired Loans | 12 | 7
Impaired Loans Without a Related Allowance | 19 | 6
Unpaid Contractual Balance | 76 | 38
Total Recorded Investment in Impaired Loans | 66 | 38
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 241 | 265
Allowance on Impaired Loans | 25 | 26
Impaired Loans Without a Related Allowance | 434 | 458
Unpaid Contractual Balance | 819 | 875
Total Recorded Investment in Impaired Loans | 675 | 723
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 25 | 28
Allowance on Impaired Loans | 2 | 2
Impaired Loans Without a Related Allowance | 122 | 127
Unpaid Contractual Balance | 191 | 201
Total Recorded Investment in Impaired Loans | 147 | 155
Retail | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 23 | 34
Allowance on Impaired Loans | 1 | 3
Impaired Loans Without a Related Allowance | 69 | 76
Unpaid Contractual Balance | 126 | 148
Total Recorded Investment in Impaired Loans | 92 | 110
Retail | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 26 | 21
Allowance on Impaired Loans | 2 | 1
Impaired Loans Without a Related Allowance | 176 | 181
Unpaid Contractual Balance | 243 | 244
Total Recorded Investment in Impaired Loans | 202 | 202
Retail | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 18 | 22
Allowance on Impaired Loans | 1 | 1
Impaired Loans Without a Related Allowance | 16 | 19
Unpaid Contractual Balance | 44 | 54
Total Recorded Investment in Impaired Loans | 34 | 41
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 1 | 1
Allowance on Impaired Loans | 0 | 0
Impaired Loans Without a Related Allowance | 6 | 7
Unpaid Contractual Balance | 10 | 11
Total Recorded Investment in Impaired Loans | 7 | 8
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 1 | 1
Allowance on Impaired Loans | 0 | 0
Impaired Loans Without a Related Allowance | 20 | 22
Unpaid Contractual Balance | 30 | 31
Total Recorded Investment in Impaired Loans | 21 | 23
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 117 | 130
Allowance on Impaired Loans | 9 | 11
Impaired Loans Without a Related Allowance | 22 | 23
Unpaid Contractual Balance | 139 | 153
Total Recorded Investment in Impaired Loans | 139 | 153
Retail | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 27 | 24
Allowance on Impaired Loans | 9 | 7
Impaired Loans Without a Related Allowance | 1 | 1
Unpaid Contractual Balance | 29 | 25
Total Recorded Investment in Impaired Loans | 28 | 25
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 3 | 4
Allowance on Impaired Loans | 1 | 1
Impaired Loans Without a Related Allowance | 2 | 2
Unpaid Contractual Balance | 7 | 8
Total Recorded Investment in Impaired Loans | $ 5 | $ 6

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