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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) contract | Jun. 30, 2020 USD ($) contract | Jun. 30, 2021 USD ($) contract | Jun. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 2,017 | 2,229 | 3,659 | 3,761
Post-modification | $ 252 | $ 124 | $ 295 | $ 200
Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 11 | 16 | 20 | 31
Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 126 | 21 | 140 | 28
Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 115 | $ 87 | $ 135 | $ 141
Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 15 | 19 | 22 | 38
Post-modification | $ 57 | $ 56 | $ 60 | $ 97
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 | 3 | 3 | 6 | 3
Commercial | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 54 | $ 53 | $ 54 | $ 94
Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 15 | 19 | 22 | 38
Post-modification | $ 57 | $ 56 | $ 60 | $ 97
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 | 3 | 3 | 6 | 3
Commercial | Commercial and industrial | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 54 | $ 53 | $ 54 | $ 94
Commercial | Commercial real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 0
Post-modification | $ 0 | $ 0 | $ 0 | $ 0
Commercial | Commercial real estate | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 0 | 0 | 0
Commercial | Commercial real estate | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 0 | 0 | 0 | 0
Commercial | Commercial real estate | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 0 | $ 0 | $ 0 | $ 0
Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 2,002 | 2,210 | 3,637 | 3,723
Post-modification | $ 195 | $ 68 | $ 235 | $ 103
Retail | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 11 | 16 | 20 | 31
Retail | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 123 | 18 | 134 | 25
Retail | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 61 | $ 34 | $ 81 | $ 47
Retail | Residential mortgages (2) |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 671 | 145 | 713 | 241
Post-modification | $ 172 | $ 28 | $ 185 | $ 45
Retail | Residential mortgages (2) | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 8 | 11 | 12 | 17
Retail | Residential mortgages (2) | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 120 | 14 | 126 | 21
Retail | Residential mortgages (2) | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 44 | $ 3 | $ 47 | $ 7
Retail | Home equity |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 102 | 266 | 249 | 389
Post-modification | $ 7 | $ 17 | $ 18 | $ 25
Retail | Home equity | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 1 | 2 | 3 | 6
Retail | Home equity | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 3 | 4 | 8 | 4
Retail | Home equity | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | $ 3 | $ 11 | $ 7 | $ 15
Retail | Automobile |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 379 | 947 | 1,048 | 1,177
Post-modification | $ 6 | $ 15 | $ 14 | $ 18
Retail | Automobile | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 1 | 0 | 1 | 1
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 | $ 5 | $ 15 | $ 13 | $ 17
Retail | Education |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 265 | 142 | 412 | 233
Post-modification | $ 9 | $ 4 | $ 13 | $ 6
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 | $ 9 | $ 4 | $ 13 | $ 6
Retail | Other retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 585 | 710 | 1,215 | 1,683
Post-modification | $ 1 | $ 4 | $ 5 | $ 9
Retail | Other retail | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-modification | 1 | 3 | 4 | 7
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 | $ 0 | $ 1 | $ 1 | $ 2

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