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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract | Dec. 31, 2017 USD ($) contract
Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 3,678 | 2,641 | 2,724
Recorded Investment | $ | $ 53 | $ 32 | $ 36
Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 182 | 339 | 386
Recorded Investment | $ | $ 26 | $ 88 | $ 66
Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 2,632 | 2,334 | 2,562
Recorded Investment | $ | $ 279 | $ 308 | $ 161
Commercial | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 3 | 7 | 7
Recorded Investment | $ | $ 0 | $ 1 | $ 1
Commercial | Interest Rate Reduction | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 3 | 7 | 7
Recorded Investment | $ | $ 0 | $ 1 | $ 1
Commercial | Interest Rate Reduction | Commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Commercial | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 27 | 52 | 46
Recorded Investment | $ | $ 5 | $ 53 | $ 22
Commercial | Maturity Extension | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 26 | 49 | 45
Recorded Investment | $ | $ 5 | $ 22 | $ 22
Commercial | Maturity Extension | Commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 1 | 3 | 1
Recorded Investment | $ | $ 0 | $ 31 | $ 0
Commercial | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 56 | 55 | 16
Recorded Investment | $ | $ 210 | $ 231 | $ 71
Commercial | Other | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 56 | 53 | 15
Recorded Investment | $ | $ 210 | $ 200 | $ 71
Commercial | Other | Commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 2 | 1
Recorded Investment | $ | $ 0 | $ 31 | $ 0
Retail | Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 3,675 | 2,634 | 2,717
Recorded Investment | $ | $ 53 | $ 31 | $ 35
Retail | Interest Rate Reduction | Residential mortgages |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 60 | 35 | 71
Recorded Investment | $ | $ 12 | $ 4 | $ 10
Retail | Interest Rate Reduction | Home equity loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 31 | 43 | 82
Recorded Investment | $ | $ 2 | $ 4 | $ 6
Retail | Interest Rate Reduction | Home equity lines of credit |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 163 | 76 | 50
Recorded Investment | $ | $ 18 | $ 7 | $ 3
Retail | Interest Rate Reduction | Home equity loans serviced by others |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 2 | 4 | 15
Recorded Investment | $ | $ 0 | $ 0 | $ 1
Retail | Interest Rate Reduction | Home equity lines of credit serviced by others |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 5 | 5
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Interest Rate Reduction | Automobile |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 160 | 158 | 130
Recorded Investment | $ | $ 3 | $ 3 | $ 2
Retail | Interest Rate Reduction | Education |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Interest Rate Reduction | Credit cards |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 3,259 | 2,312 | 2,363
Recorded Investment | $ | $ 18 | $ 13 | $ 13
Retail | Interest Rate Reduction | Other retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 1 | 1
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Maturity Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 155 | 287 | 340
Recorded Investment | $ | $ 21 | $ 35 | $ 44
Retail | Maturity Extension | Residential mortgages |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 62 | 61 | 73
Recorded Investment | $ | $ 10 | $ 8 | $ 13
Retail | Maturity Extension | Home equity loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 1 | 1
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Maturity Extension | Home equity lines of credit |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 72 | 178 | 235
Recorded Investment | $ | $ 11 | $ 26 | $ 30
Retail | Maturity Extension | Home equity loans serviced by others |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Maturity Extension | Home equity lines of credit serviced by others |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 1 | 2
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Maturity Extension | Automobile |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 21 | 46 | 29
Recorded Investment | $ | $ 0 | $ 1 | $ 1
Retail | Maturity Extension | Education |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Maturity Extension | Credit cards |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Maturity Extension | Other retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 0
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Retail | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 2,576 | 2,279 | 2,546
Recorded Investment | $ | $ 69 | $ 77 | $ 90
Retail | Other | Residential mortgages |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 120 | 142 | 171
Recorded Investment | $ | $ 17 | $ 17 | $ 19
Retail | Other | Home equity loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 82 | 134 | 232
Recorded Investment | $ | $ 4 | $ 5 | $ 13
Retail | Other | Home equity lines of credit |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 350 | 413 | 395
Recorded Investment | $ | $ 22 | $ 29 | $ 27
Retail | Other | Home equity loans serviced by others |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 14 | 23 | 52
Recorded Investment | $ | $ 0 | $ 1 | $ 2
Retail | Other | Home equity lines of credit serviced by others |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 8 | 14 | 26
Recorded Investment | $ | $ 0 | $ 1 | $ 2
Retail | Other | Automobile |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 1,250 | 1,189 | 1,336
Recorded Investment | $ | $ 17 | $ 17 | $ 20
Retail | Other | Education |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 272 | 355 | 329
Recorded Investment | $ | $ 7 | $ 7 | $ 7
Retail | Other | Credit cards |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 304 | 0 | 0
Recorded Investment | $ | $ 1 | $ 0 | $ 0
Retail | Other | Other retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 176 | 9 | 5
Recorded Investment | $ | $ 1 | $ 0 | $ 0

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