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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Impaired Loans by Class (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | $ 582 | $ 506
Allowance on Impaired Loans | 90 | 81
Impaired Loans Without a Related Allowance | 586 | 625
Unpaid Contractual Balance | 1,398 | 1,364
Total Recorded Investment in Impaired Loans | 1,168 | 1,131
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 303 | 208
Allowance on Impaired Loans | 62 | 47
Impaired Loans Without a Related Allowance | 123 | 162
Unpaid Contractual Balance | 500 | 443
Total Recorded Investment in Impaired Loans | 426 | 370
Commercial | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 278 | 183
Allowance on Impaired Loans | 57 | 42
Impaired Loans Without a Related Allowance | 113 | 159
Unpaid Contractual Balance | 451 | 403
Total Recorded Investment in Impaired Loans | 391 | 342
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 25 | 25
Allowance on Impaired Loans | 5 | 5
Impaired Loans Without a Related Allowance | 10 | 3
Unpaid Contractual Balance | 49 | 40
Total Recorded Investment in Impaired Loans | 35 | 28
Commercial | Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 0 | 0
Allowance on Impaired Loans | 0 | 0
Impaired Loans Without a Related Allowance | 0 | 0
Unpaid Contractual Balance | 0 | 0
Total Recorded Investment in Impaired Loans | 0 | 0
Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 279 | 298
Allowance on Impaired Loans | 28 | 34
Impaired Loans Without a Related Allowance | 463 | 463
Unpaid Contractual Balance | 898 | 921
Total Recorded Investment in Impaired Loans | 742 | 761
Retail | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 29 | 25
Allowance on Impaired Loans | 2 | 2
Impaired Loans Without a Related Allowance | 127 | 126
Unpaid Contractual Balance | 201 | 197
Total Recorded Investment in Impaired Loans | 156 | 151
Retail | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 36 | 41
Allowance on Impaired Loans | 3 | 4
Impaired Loans Without a Related Allowance | 75 | 80
Unpaid Contractual Balance | 150 | 162
Total Recorded Investment in Impaired Loans | 111 | 121
Retail | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 17 | 16
Allowance on Impaired Loans | 1 | 1
Impaired Loans Without a Related Allowance | 185 | 181
Unpaid Contractual Balance | 247 | 241
Total Recorded Investment in Impaired Loans | 202 | 197
Retail | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 25 | 29
Allowance on Impaired Loans | 2 | 2
Impaired Loans Without a Related Allowance | 21 | 22
Unpaid Contractual Balance | 60 | 67
Total Recorded Investment in Impaired Loans | 46 | 51
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 2 | 2
Allowance on Impaired Loans | 0 | 0
Impaired Loans Without a Related Allowance | 7 | 7
Unpaid Contractual Balance | 12 | 14
Total Recorded Investment in Impaired Loans | 9 | 9
Retail | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 2 | 2
Allowance on Impaired Loans | 0 | 0
Impaired Loans Without a Related Allowance | 22 | 21
Unpaid Contractual Balance | 30 | 30
Total Recorded Investment in Impaired Loans | 24 | 23
Retail | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 140 | 154
Allowance on Impaired Loans | 12 | 17
Impaired Loans Without a Related Allowance | 23 | 21
Unpaid Contractual Balance | 164 | 175
Total Recorded Investment in Impaired Loans | 163 | 175
Retail | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 24 | 24
Allowance on Impaired Loans | 7 | 7
Impaired Loans Without a Related Allowance | 0 | 1
Unpaid Contractual Balance | 25 | 25
Total Recorded Investment in Impaired Loans | 24 | 25
Retail | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 4 | 5
Allowance on Impaired Loans | 1 | 1
Impaired Loans Without a Related Allowance | 3 | 4
Unpaid Contractual Balance | 9 | 10
Total Recorded Investment in Impaired Loans | $ 7 | $ 9

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