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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, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | $ 537 | $ 506
Allowance on Impaired Loans | 86 | 81
Impaired Loans Without a Related Allowance | 628 | 625
Unpaid Contractual Balance | 1,407 | 1,364
Total Recorded Investment in Impaired Loans | 1,165 | 1,131
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 268 | 208
Allowance on Impaired Loans | 59 | 47
Impaired Loans Without a Related Allowance | 162 | 162
Unpaid Contractual Balance | 517 | 443
Total Recorded Investment in Impaired Loans | 430 | 370
Commercial | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 237 | 183
Allowance on Impaired Loans | 52 | 42
Impaired Loans Without a Related Allowance | 133 | 159
Unpaid Contractual Balance | 439 | 403
Total Recorded Investment in Impaired Loans | 370 | 342
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 31 | 25
Allowance on Impaired Loans | 7 | 5
Impaired Loans Without a Related Allowance | 29 | 3
Unpaid Contractual Balance | 78 | 40
Total Recorded Investment in Impaired Loans | 60 | 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 | 269 | 298
Allowance on Impaired Loans | 27 | 34
Impaired Loans Without a Related Allowance | 466 | 463
Unpaid Contractual Balance | 890 | 921
Total Recorded Investment in Impaired Loans | 735 | 761
Retail | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 28 | 25
Allowance on Impaired Loans | 2 | 2
Impaired Loans Without a Related Allowance | 128 | 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 | 34 | 41
Allowance on Impaired Loans | 3 | 4
Impaired Loans Without a Related Allowance | 72 | 80
Unpaid Contractual Balance | 145 | 162
Total Recorded Investment in Impaired Loans | 106 | 121
Retail | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 18 | 16
Allowance on Impaired Loans | 1 | 1
Impaired Loans Without a Related Allowance | 190 | 181
Unpaid Contractual Balance | 253 | 241
Total Recorded Investment in Impaired Loans | 208 | 197
Retail | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 23 | 29
Allowance on Impaired Loans | 2 | 2
Impaired Loans Without a Related Allowance | 20 | 22
Unpaid Contractual Balance | 57 | 67
Total Recorded Investment in Impaired Loans | 43 | 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 | 23 | 21
Unpaid Contractual Balance | 31 | 30
Total Recorded Investment in Impaired Loans | 25 | 23
Retail | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Loans With a Related Allowance | 134 | 154
Allowance on Impaired Loans | 11 | 17
Impaired Loans Without a Related Allowance | 23 | 21
Unpaid Contractual Balance | 158 | 175
Total Recorded Investment in Impaired Loans | 157 | 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 | 8 | 10
Total Recorded Investment in Impaired Loans | $ 7 | $ 9

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