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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring Activity (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 2,794 | 3,678 | 2,641
Amortized Cost | $ | $ 63 | $ 53 | $ 32
Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 471 | 182 | 339
Amortized Cost | $ | $ 161 | $ 26 | $ 88
Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 4,294 | 2,632 | 2,334
Amortized Cost | $ | $ 420 | $ 279 | $ 308
Commercial | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 1 | 3 | 7
Amortized Cost | $ | $ 0 | $ 0 | $ 1
Commercial | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 26 | 27 | 52
Amortized Cost | $ | $ 114 | $ 5 | $ 53
Commercial | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 44 | 56 | 55
Amortized Cost | $ | $ 325 | $ 210 | $ 231
Commercial | Commercial and industrial | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 1 | 3 | 7
Amortized Cost | $ | $ 0 | $ 0 | $ 1
Commercial | Commercial and industrial | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 25 | 26 | 49
Amortized Cost | $ | $ 107 | $ 5 | $ 22
Commercial | Commercial and industrial | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 44 | 56 | 53
Amortized Cost | $ | $ 325 | $ 210 | $ 200
Commercial | Commercial real estate | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0
Commercial | Commercial real estate | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 1 | 1 | 3
Amortized Cost | $ | $ 7 | $ 0 | $ 31
Commercial | Commercial real estate | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 2
Amortized Cost | $ | $ 0 | $ 0 | $ 31
Retail | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 2,793 | 3,675 | 2,634
Amortized Cost | $ | $ 63 | $ 53 | $ 31
Retail | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 445 | 155 | 287
Amortized Cost | $ | $ 47 | $ 21 | $ 35
Retail | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 4,250 | 2,576 | 2,279
Amortized Cost | $ | $ 95 | $ 69 | $ 77
Retail | Residential mortgages | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 210 | 60 | 35
Amortized Cost | $ | $ 39 | $ 12 | $ 4
Retail | Residential mortgages | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 190 | 62 | 61
Amortized Cost | $ | $ 34 | $ 10 | $ 8
Retail | Residential mortgages | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 73 | 120 | 142
Amortized Cost | $ | $ 13 | $ 17 | $ 17
Retail | Home equity | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 143 | 196 | 128
Amortized Cost | $ | $ 12 | $ 20 | $ 11
Retail | Home equity | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 151 | 72 | 180
Amortized Cost | $ | $ 12 | $ 11 | $ 26
Retail | Home equity | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 429 | 454 | 584
Amortized Cost | $ | $ 23 | $ 26 | $ 36
Retail | Automobile | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 129 | 160 | 158
Amortized Cost | $ | $ 2 | $ 3 | $ 3
Retail | Automobile | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 104 | 21 | 46
Amortized Cost | $ | $ 1 | $ 0 | $ 1
Retail | Automobile | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 3,003 | 1,250 | 1,189
Amortized Cost | $ | $ 47 | $ 17 | $ 17
Retail | Education | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0
Retail | Education | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0
Retail | Education | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 465 | 272 | 355
Amortized Cost | $ | $ 10 | $ 7 | $ 7
Retail | Other retail | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 2,311 | 3,259 | 2,313
Amortized Cost | $ | $ 10 | $ 18 | $ 13
Retail | Other retail | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0
Retail | Other retail | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 280 | 480 | 9
Amortized Cost | $ | $ 2 | $ 2 | $ 0

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