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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 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
High loan-to-value |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 503 | $ 553
High loan-to-value | Residential Mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 408 | 402
High loan-to-value | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 95 | 151
High loan-to-value | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Interest-only/negative amortization |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,594 | 2,043
Interest-only/negative amortization | Residential Mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,594 | 2,043
Interest-only/negative amortization | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Interest-only/negative amortization | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Low introductory rate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 183 | 235
Low introductory rate | Residential Mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Low introductory rate | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Low introductory rate | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 183 | 235
Multiple characteristics and other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 4 |
Multiple characteristics and other | Residential Mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 4 |
Multiple characteristics and other | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 |
Multiple characteristics and other | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 |
Credit risk, loans with increased credit exposure |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,284 | 2,831
Credit risk, loans with increased credit exposure | Residential Mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,006 | 2,445
Credit risk, loans with increased credit exposure | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 95 | 151
Credit risk, loans with increased credit exposure | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 183 | $ 235

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