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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring Activity (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) contract | Sep. 30, 2019 USD ($) contract | Sep. 30, 2020 USD ($) contract | Sep. 30, 2019 USD ($) contract
Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 505 | 928 | 2,259 | 2,649
Amortized Cost | $ | $ 13 | $ 14 | $ 44 | $ 37
Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 152 | 34 | 322 | 130
Amortized Cost | $ | $ 113 | $ 4 | $ 141 | $ 17
Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1,458 | 809 | 3,295 | 1,975
Amortized Cost | $ | $ 32 | $ 31 | $ 173 | $ 154
Commercial | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 2 | 0 | 3
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Commercial | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 12 | 6 | 18 | 19
Amortized Cost | $ | $ 103 | $ 1 | $ 106 | $ 2
Commercial | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 2 | 6 | 34 | 24
Amortized Cost | $ | $ 1 | $ 15 | $ 95 | $ 102
Commercial | Commercial | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 2 | 0 | 3
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Commercial | Commercial | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 12 | 6 | 18 | 18
Amortized Cost | $ | $ 103 | $ 1 | $ 106 | $ 2
Commercial | Commercial | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 2 | 6 | 34 | 24
Amortized Cost | $ | $ 1 | $ 15 | $ 95 | $ 102
Commercial | Commercial real estate | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Commercial | Commercial real estate | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 1
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Commercial | Commercial real estate | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 505 | 926 | 2,259 | 2,646
Amortized Cost | $ | $ 13 | $ 14 | $ 44 | $ 37
Retail | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 140 | 28 | 304 | 111
Amortized Cost | $ | $ 10 | $ 3 | $ 35 | $ 15
Retail | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1,456 | 803 | 3,261 | 1,951
Amortized Cost | $ | $ 31 | $ 16 | $ 78 | $ 52
Retail | Residential mortgages | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 47 | 12 | 139 | 25
Amortized Cost | $ | $ 9 | $ 2 | $ 26 | $ 6
Retail | Residential mortgages | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 41 | 8 | 149 | 29
Amortized Cost | $ | $ 6 | $ 2 | $ 27 | $ 5
Retail | Residential mortgages | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 19 | 25 | 60 | 87
Amortized Cost | $ | $ 4 | $ 4 | $ 11 | $ 13
Retail | Home equity | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 23 | 63 | 96 | 148
Amortized Cost | $ | $ 2 | $ 6 | $ 8 | $ 15
Retail | Home equity | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 52 | 16 | 107 | 66
Amortized Cost | $ | $ 4 | $ 1 | $ 8 | $ 10
Retail | Home equity | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 104 | 120 | 365 | 358
Amortized Cost | $ | $ 6 | $ 6 | $ 21 | $ 21
Retail | Automobile | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 25 | 46 | 108 | 111
Amortized Cost | $ | $ 1 | $ 1 | $ 2 | $ 2
Retail | Automobile | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 47 | 4 | 48 | 16
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Automobile | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1,119 | 309 | 2,212 | 933
Amortized Cost | $ | $ 18 | $ 4 | $ 35 | $ 13
Retail | Education | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Education | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Education | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 140 | 131 | 373 | 211
Amortized Cost | $ | $ 3 | $ 2 | $ 9 | $ 5
Retail | Other retail | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 410 | 805 | 1,916 | 2,362
Amortized Cost | $ | $ 1 | $ 5 | $ 8 | $ 14
Retail | Other retail | Maturity Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 0 | 0
Amortized Cost | $ | $ 0 | $ 0 | $ 0 | $ 0
Retail | Other retail | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 74 | 218 | 251 | 362
Amortized Cost | $ | $ 0 | $ 0 | $ 2 | $ 0

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