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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
--- | ---
Mar. 31, 2022 USD ($) contract | Mar. 31, 2021 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 2,198 | 1,642
Post-modification | $ 302 | $ 43
Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 27 | 9
Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 38 | 14
Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 237 | $ 20
Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 10 | 7
Post-modification | $ 31 | $ 3
Commercial | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 0 | 0
Commercial | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 24 | 3
Commercial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 7 | $ 0
Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 10 | 7
Post-modification | $ 31 | $ 3
Commercial | Commercial and industrial | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 0 | 0
Commercial | Commercial and industrial | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 24 | 3
Commercial | Commercial and industrial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 7 | $ 0
Retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 2,188 | 1,635
Post-modification | $ 271 | $ 40
Retail | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 27 | 9
Retail | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 14 | 11
Retail | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 230 | $ 20
Retail | Residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 1,181 | 42
Post-modification | $ 250 | $ 13
Retail | Residential mortgages | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 22 | 4
Retail | Residential mortgages | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 14 | 6
Retail | Residential mortgages | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 214 | $ 3
Retail | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 178 | 147
Post-modification | $ 11 | $ 11
Retail | Home equity | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 2 | 2
Retail | Home equity | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 0 | 5
Retail | Home equity | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 9 | $ 4
Retail | Automobile |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 165 | 669
Post-modification | $ 2 | $ 8
Retail | Automobile | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 1 | 0
Retail | Automobile | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 0 | 0
Retail | Automobile | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 1 | $ 8
Retail | Education |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 143 | 147
Post-modification | $ 6 | $ 4
Retail | Education | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 0 | 0
Retail | Education | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 0 | 0
Retail | Education | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 6 | $ 4
Retail | Other retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | contract | 521 | 630
Post-modification | $ 2 | $ 4
Retail | Other retail | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 2 | 3
Retail | Other retail | Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | 0 | 0
Retail | Other retail | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-modification | $ 0 | $ 1

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