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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring Activity (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) contract | Mar. 31, 2020 USD ($) contract
Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 631 | 992
Amortized Cost | $ | $ 9 | $ 15
Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 105 | 45
Amortized Cost | $ | $ 14 | $ 7
Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 906 | 495
Amortized Cost | $ | $ 20 | $ 54
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 | 3 | 2
Amortized Cost | $ | $ 3 | $ 0
Commercial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 4 | 17
Amortized Cost | $ | $ 0 | $ 41
Commercial | Commercial and industrial | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 0 | 0
Amortized Cost | $ | $ 0 | $ 0
Commercial | Commercial and industrial | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 3 | 2
Amortized Cost | $ | $ 3 | $ 0
Commercial | Commercial and industrial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 4 | 17
Amortized Cost | $ | $ 0 | $ 41
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 | 631 | 992
Amortized Cost | $ | $ 9 | $ 15
Retail | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 102 | 43
Amortized Cost | $ | $ 11 | $ 7
Retail | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 902 | 478
Amortized Cost | $ | $ 20 | $ 13
Retail | Residential mortgages | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 20 | 38
Amortized Cost | $ | $ 4 | $ 6
Retail | Residential mortgages | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 9 | 37
Amortized Cost | $ | $ 6 | $ 7
Retail | Residential mortgages | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 13 | 21
Amortized Cost | $ | $ 3 | $ 4
Retail | Home equity | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 34 | 46
Amortized Cost | $ | $ 2 | $ 4
Retail | Home equity | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 41 | 6
Amortized Cost | $ | $ 5 | $ 0
Retail | Home equity | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 72 | 71
Amortized Cost | $ | $ 4 | $ 4
Retail | Automobile | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 21 | 47
Amortized Cost | $ | $ 0 | $ 1
Retail | Automobile | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 52 | 0
Amortized Cost | $ | $ 0 | $ 0
Retail | Automobile | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 596 | 183
Amortized Cost | $ | $ 8 | $ 2
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 | 147 | 91
Amortized Cost | $ | $ 4 | $ 2
Retail | Other retail | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 556 | 861
Amortized Cost | $ | $ 3 | $ 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 | 74 | 112
Amortized Cost | $ | $ 1 | $ 1

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