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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring Activity (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) contract | Sep. 30, 2020 USD ($) contract | Sep. 30, 2021 USD ($) contract | Sep. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1,176 | 2,115 | 4,835 | 5,876
Post-modification | $ 81 | $ 158 | $ 376 | $ 358
Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 5 | 13 | 25 | 44
Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 46 | 113 | 186 | 141
Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 30 | $ 32 | $ 165 | $ 173
Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 7 | 14 | 29 | 52
Post-modification | $ 48 | $ 104 | $ 108 | $ 201
Commercial | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 0 | 0 | 0
Commercial | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 38 | 103 | 44 | 106
Commercial | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 10 | $ 1 | $ 64 | $ 95
Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 7 | 14 | 29 | 52
Post-modification | $ 48 | $ 104 | $ 108 | $ 201
Commercial | Commercial and industrial | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 0 | 0 | 0
Commercial | Commercial and industrial | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 38 | 103 | 44 | 106
Commercial | Commercial and industrial | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 10 | $ 1 | $ 64 | $ 95
Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1,169 | 2,101 | 4,806 | 5,824
Post-modification | $ 33 | $ 54 | $ 268 | $ 157
Retail | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 5 | 13 | 25 | 44
Retail | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 8 | 10 | 142 | 35
Retail | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 20 | $ 31 | $ 101 | $ 78
Retail | Residential mortgage |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 101 | 107 | 814 | 348
Post-modification | $ 16 | $ 19 | $ 201 | $ 64
Retail | Residential mortgage | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 2 | 9 | 14 | 26
Retail | Residential mortgage | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 7 | 6 | 133 | 27
Retail | Residential mortgage | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 7 | $ 4 | $ 54 | $ 11
Retail | Home equity |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 69 | 179 | 318 | 568
Post-modification | $ 4 | $ 12 | $ 22 | $ 37
Retail | Home equity | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 2 | 3 | 8
Retail | Home equity | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 1 | 4 | 9 | 8
Retail | Home equity | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 3 | $ 6 | $ 10 | $ 21
Retail | Automobile |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 224 | 1,191 | 1,272 | 2,368
Post-modification | $ 1 | $ 19 | $ 15 | $ 37
Retail | Automobile | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 1 | 1 | 2
Retail | Automobile | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 0 | 0 | 0
Retail | Automobile | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 1 | $ 18 | $ 14 | $ 35
Retail | Education |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 226 | 140 | 638 | 373
Post-modification | $ 8 | $ 3 | $ 21 | $ 9
Retail | Education | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 0 | 0 | 0
Retail | Education | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 0 | 0 | 0
Retail | Education | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 8 | $ 3 | $ 21 | $ 9
Retail | Other retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 549 | 484 | 1,764 | 2,167
Post-modification | $ 4 | $ 1 | $ 9 | $ 10
Retail | Other retail | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 3 | 1 | 7 | 8
Retail | Other retail | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 0 | 0 | 0
Retail | Other retail | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 1 | $ 0 | $ 2 | $ 2

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