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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Loans with Indicators of High Credit Risk (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 119,088 | $ 116,660
High loan-to-value |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 553 | 553
High loan-to-value | Residential mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 402 | 318
High loan-to-value | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 61 | 87
High loan-to-value | Home Equity Products Serviced by Others |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 90 | 148
High loan-to-value | Credit Cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
High loan-to-value | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Interest only/negative amortization |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,043 | 1,795
Interest only/negative amortization | Residential mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,043 | 1,794
Interest only/negative amortization | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Interest only/negative amortization | Home Equity Products Serviced by Others |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Interest only/negative amortization | Credit Cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Interest only/negative amortization | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 1
Low introductory rate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 235 | 217
Low introductory rate | Residential mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Low introductory rate | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Low introductory rate | Home Equity Products Serviced by Others |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Low introductory rate | Credit Cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 235 | 217
Low introductory rate | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Multiple characteristics and other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 1
Multiple characteristics and other | Residential mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 1
Multiple characteristics and other | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Multiple characteristics and other | Home Equity Products Serviced by Others |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Multiple characteristics and other | Credit Cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Multiple characteristics and other | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Credit risk, loans with increased credit exposure |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,831 | 2,566
Credit risk, loans with increased credit exposure | Residential mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,445 | 2,113
Credit risk, loans with increased credit exposure | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 61 | 87
Credit risk, loans with increased credit exposure | Home Equity Products Serviced by Others |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 90 | 148
Credit risk, loans with increased credit exposure | Credit Cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 235 | 217
Credit risk, loans with increased credit exposure | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | $ 1

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