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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Default of Modified Debt Agreements (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) contract | Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 1,103 | 1,116 | 1,074
Balance Defaulted | $ | $ 103 | $ 50 | $ 60
Commercial | Commercial Banking |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 29 | 9 | 23
Balance Defaulted | $ | $ 63 | $ 9 | $ 13
Commercial | Commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 28 | 8 | 22
Balance Defaulted | $ | $ 63 | $ 5 | $ 13
Commercial | Commercial real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 1 | 1 | 1
Balance Defaulted | $ | $ 0 | $ 4 | $ 0
Retail | Retail |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 1,074 | 1,107 | 1,051
Balance Defaulted | $ | $ 40 | $ 41 | $ 47
Retail | Residential mortgages |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 128 | 152 | 187
Balance Defaulted | $ | $ 15 | $ 19 | $ 24
Retail | Home equity loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 31 | 43 | 50
Balance Defaulted | $ | $ 2 | $ 2 | $ 3
Retail | Home equity lines of credit |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 238 | 200 | 155
Balance Defaulted | $ | $ 18 | $ 14 | $ 13
Retail | Home equity loans serviced by others |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 15 | 23 | 37
Balance Defaulted | $ | $ 0 | $ 0 | $ 1
Retail | Home equity lines of credit serviced by others |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 6 | 10 | 17
Balance Defaulted | $ | $ 0 | $ 1 | $ 0
Retail | Automobile |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 167 | 140 | 110
Balance Defaulted | $ | $ 2 | $ 1 | $ 2
Retail | Education |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 23 | 44 | 59
Balance Defaulted | $ | $ 1 | $ 1 | $ 1
Retail | Credit cards |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 465 | 491 | 433
Balance Defaulted | $ | $ 2 | $ 3 | $ 3
Retail | Other retail |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 1 | 4 | 3
Balance Defaulted | $ | $ 0 | $ 0 | $ 0

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