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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, 2020 | Dec. 31, 2019
--- | --- | ---
High loan-to-value |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 353 | $ 553
High loan-to-value | Residential mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 289 | 402
High loan-to-value | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 64 | 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 | 2,801 | 2,043
Interest-only/negative amortization | Residential mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,801 | 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 | 170 | 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 | 170 | 235
Credit risk, loans with increased credit exposure |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,324 | 2,831
Credit risk, loans with increased credit exposure | Residential mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,090 | 2,445
Credit risk, loans with increased credit exposure | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 64 | 151
Credit risk, loans with increased credit exposure | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 170 | $ 235

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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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