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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring Activity (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) contract | Mar. 31, 2019 USD ($) contract
Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 992 | 681
Amortized Cost | $ | $ 15 | $ 10
Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 45 | 56
Amortized Cost | $ | $ 7 | $ 9
Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 495 | 537
Amortized Cost | $ | $ 54 | $ 59
Commercial | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Commercial | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 2 | 5
Amortized Cost | $ | $ 0 | $ 1
Commercial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 17 | 12
Amortized Cost | $ | $ 41 | $ 40
Commercial | Commercial | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Commercial | Commercial | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 2 | 5
Amortized Cost | $ | $ 0 | $ 1
Commercial | Commercial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 17 | 12
Amortized Cost | $ | $ 41 | $ 40
Commercial | Commercial real estate | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Commercial | Commercial real estate | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Commercial | Commercial real estate | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Retail | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 992 | 681
Amortized Cost | $ | $ 15 | $ 10
Retail | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 43 | 51
Amortized Cost | $ | $ 7 | $ 8
Retail | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 478 | 525
Amortized Cost | $ | $ 13 | $ 19
Retail | Residential mortgages | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 38 | 4
Amortized Cost | $ | $ 6 | $ 2
Retail | Residential mortgages | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 37 | 11
Amortized Cost | $ | $ 7 | $ 2
Retail | Residential mortgages | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 21 | 30
Amortized Cost | $ | $ 4 | $ 4
Retail | Home equity | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 46 | 36
Amortized Cost | $ | $ 4 | $ 4
Retail | Home equity | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 6 | 35
Amortized Cost | $ | $ 0 | $ 6
Retail | Home equity | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 71 | 138
Amortized Cost | $ | $ 4 | $ 9
Retail | Automobile | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 47 | 25
Amortized Cost | $ | $ 1 | $ 0
Retail | Automobile | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 5
Amortized Cost | $ | $ 0 | $ 0
Retail | Automobile | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 183 | 289
Amortized Cost | $ | $ 2 | $ 4
Retail | Education | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Retail | Education | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Retail | Education | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 91 | 67
Amortized Cost | $ | $ 2 | $ 2
Retail | Other retail | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 861 | 616
Amortized Cost | $ | $ 4 | $ 4
Retail | Other retail | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Retail | Other retail | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 112 | 1
Amortized Cost | $ | $ 1 | $ 0

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