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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Default of Modified Debt Agreements (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 USD ($) contract | Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 239 | 272 | 521 | 536
Balance Defaulted | $ | $ 27 | $ 12 | $ 40 | $ 26
Commercial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 4 | 4 | 7 | 6
Balance Defaulted | $ | $ 17 | $ 1 | $ 20 | $ 5
Commercial | Commercial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 3 | 4 | 6 | 5
Balance Defaulted | $ | $ 17 | $ 1 | $ 20 | $ 1
Commercial | Commercial real estate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 1 | 0 | 1 | 1
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 4
Commercial | Leases |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 0
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 235 | 268 | 514 | 530
Balance Defaulted | $ | $ 10 | $ 11 | $ 20 | $ 21
Retail | Residential mortgages |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 44 | 41 | 70 | 86
Balance Defaulted | $ | $ 5 | $ 4 | $ 8 | $ 10
Retail | Home equity loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 7 | 14 | 18 | 23
Balance Defaulted | $ | $ 0 | $ 1 | $ 1 | $ 1
Retail | Home equity lines of credit |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 40 | 65 | 106 | 100
Balance Defaulted | $ | $ 3 | $ 4 | $ 8 | $ 7
Retail | Home equity loans serviced by others |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 5 | 9 | 10 | 10
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Home equity lines of credit serviced by others |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 1 | 1 | 4
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Automobile |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 30 | 27 | 76 | 61
Balance Defaulted | $ | $ 1 | $ 1 | $ 1 | $ 1
Retail | Education |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 7 | 9 | 12 | 16
Balance Defaulted | $ | $ 1 | $ 0 | $ 1 | $ 0
Retail | Credit cards |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 102 | 102 | 221 | 228
Balance Defaulted | $ | $ 0 | $ 1 | $ 1 | $ 2
Retail | Other retail |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 2
Balance Defaulted | $ | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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