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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Loans with Indicators of High Credit Risk (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items] |  |
High loan to value criteria (exceeds) | 90.00% |
High loan-to-value |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 262 | $ 353
High loan-to-value | Residential Mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 235 | 289
High loan-to-value | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 27 | 64
High loan-to-value | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
High loan-to-value | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Interest-only |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,144 | 2,801
Interest-only | Residential Mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,143 | 2,801
Interest-only | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Interest-only | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Interest-only | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1 | 0
Low introductory rate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 135 | 170
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 | 135 | 170
Low introductory rate | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 0 | 0
Credit risk, loans with increased credit exposure |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,541 | 3,324
Credit risk, loans with increased credit exposure | Residential Mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,378 | 3,090
Credit risk, loans with increased credit exposure | Home Equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 27 | 64
Credit risk, loans with increased credit exposure | Other Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 135 | 170
Credit risk, loans with increased credit exposure | Education |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 1 | $ 1

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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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