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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) contract | Mar. 31, 2018 USD ($) contract
Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 681 | 668
Recorded Investment | $ | $ 10 | $ 7
Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 56 | 73
Recorded Investment | $ | $ 9 | $ 8
Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 537 | 591
Recorded Investment | $ | $ 59 | $ 95
Commercial | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 1
Recorded Investment | $ | $ 0 | $ 0
Commercial | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 5 | 7
Recorded Investment | $ | $ 1 | $ 1
Commercial | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 12 | 18
Recorded Investment | $ | $ 40 | $ 75
Commercial | Commercial | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 1
Recorded Investment | $ | $ 0 | $ 0
Commercial | Commercial | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 5 | 6
Recorded Investment | $ | $ 1 | $ 1
Commercial | Commercial | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 12 | 18
Recorded Investment | $ | $ 40 | $ 75
Commercial | Commercial real estate | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Commercial | Commercial real estate | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 1
Recorded Investment | $ | $ 0 | $ 0
Commercial | Commercial real estate | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 681 | 667
Recorded Investment | $ | $ 10 | $ 7
Retail | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 51 | 66
Recorded Investment | $ | $ 8 | $ 7
Retail | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 525 | 573
Recorded Investment | $ | $ 19 | $ 20
Retail | Residential mortgages | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 4 | 7
Recorded Investment | $ | $ 2 | $ 1
Retail | Residential mortgages | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 11 | 7
Recorded Investment | $ | $ 2 | $ 1
Retail | Residential mortgages | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 30 | 53
Recorded Investment | $ | $ 4 | $ 6
Retail | Home equity loans | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 7 | 11
Recorded Investment | $ | $ 0 | $ 1
Retail | Home equity loans | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Home equity loans | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 27 | 32
Recorded Investment | $ | $ 1 | $ 2
Retail | Home equity lines of credit | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 29 | 15
Recorded Investment | $ | $ 4 | $ 1
Retail | Home equity lines of credit | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 35 | 42
Recorded Investment | $ | $ 6 | $ 5
Retail | Home equity lines of credit | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 105 | 93
Recorded Investment | $ | $ 8 | $ 7
Retail | Home equity loans serviced by others | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 1
Recorded Investment | $ | $ 0 | $ 0
Retail | Home equity loans serviced by others | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Home equity loans serviced by others | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 4 | 7
Recorded Investment | $ | $ 0 | $ 0
Retail | Home equity lines of credit serviced by others | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 2
Recorded Investment | $ | $ 0 | $ 0
Retail | Home equity lines of credit serviced by others | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Home equity lines of credit serviced by others | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 2 | 3
Recorded Investment | $ | $ 0 | $ 0
Retail | Automobile | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 25 | 36
Recorded Investment | $ | $ 0 | $ 1
Retail | Automobile | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 5 | 17
Recorded Investment | $ | $ 0 | $ 1
Retail | Automobile | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 289 | 269
Recorded Investment | $ | $ 4 | $ 4
Retail | Education | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Education | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Education | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 67 | 112
Recorded Investment | $ | $ 2 | $ 1
Retail | Credit cards | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 616 | 594
Recorded Investment | $ | $ 4 | $ 3
Retail | Credit cards | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Credit cards | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Other retail | Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 1
Recorded Investment | $ | $ 0 | $ 0
Retail | Other retail | Maturity Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 0
Recorded Investment | $ | $ 0 | $ 0
Retail | Other retail | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 1 | 4
Recorded Investment | $ | $ 0 | $ 0

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