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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Modified (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 1,093,000,000 | $ 1,093,000,000
Total as a % of Loan Class | 0.75% |
Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 724,000,000
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 20,000,000
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 8,000,000
Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 43,000,000
Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 298,000,000
Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 918,000,000 | 918,000,000
Total as a % of Loan Class | 1.23% |
Commercial | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 613,000,000
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 7,000,000
Commercial | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Commercial | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 26,000,000
Commercial | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 272,000,000
Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 325,000,000 | $ 325,000,000
Total as a % of Loan Class | 0.74% |
Weighted-Average Interest Rate Reduction |  | 2.02%
Weighted-Average Term Extension (in Months) |  | 15 months
Weighted-Average Payment Deferral |  | $ 562,777
Commercial | Commercial and industrial | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 211,000,000
Commercial | Commercial and industrial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Commercial | Commercial and industrial | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Commercial | Commercial and industrial | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Commercial | Commercial and industrial | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 114,000,000
Commercial | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 593,000,000 | $ 593,000,000
Total as a % of Loan Class | 2.01% |
Weighted-Average Interest Rate Reduction |  | 0.59%
Weighted-Average Term Extension (in Months) |  | 11 months
Weighted-Average Payment Deferral |  | $ 30,821
Commercial | Commercial real estate | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 402,000,000
Commercial | Commercial real estate | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 7,000,000
Commercial | Commercial real estate | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Commercial | Commercial real estate | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 26,000,000
Commercial | Commercial real estate | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 158,000,000
Retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 175,000,000 | 175,000,000
Total as a % of Loan Class | 0.24% |
Retail | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 111,000,000
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 13,000,000
Retail | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 8,000,000
Retail | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 17,000,000
Retail | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 26,000,000
Retail | Residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 109,000,000 | $ 109,000,000
Total as a % of Loan Class | 0.35% |
Weighted-Average Interest Rate Reduction |  | 1.58%
Weighted-Average Term Extension (in Months) |  | 50 months
Weighted-Average Payment Deferral |  | $ 0
Retail | Residential mortgages | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 61,000,000
Retail | Residential mortgages | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 11,000,000
Retail | Residential mortgages | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 7,000,000
Retail | Residential mortgages | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 17,000,000
Retail | Residential mortgages | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 13,000,000
Retail | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 15,000,000 | $ 15,000,000
Total as a % of Loan Class | 0.10% |
Weighted-Average Interest Rate Reduction |  | 2.64%
Weighted-Average Term Extension (in Months) |  | 120 months
Weighted-Average Payment Deferral |  | $ 1,366
Retail | Home equity | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 5,000,000
Retail | Home equity | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Home equity | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Home equity | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Home equity | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 10,000,000
Retail | Automobile |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 0 | $ 0
Total as a % of Loan Class | 0.00% |
Weighted-Average Interest Rate Reduction |  | 3.60%
Weighted-Average Term Extension (in Months) |  | 18 months
Weighted-Average Payment Deferral |  | $ 1,245
Retail | Automobile | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Automobile | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Automobile | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Automobile | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Automobile | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Education |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 40,000,000 | $ 40,000,000
Total as a % of Loan Class | 0.34% |
Weighted-Average Interest Rate Reduction |  | 4.76%
Weighted-Average Payment Deferral |  | $ 6,134
Retail | Education | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 37,000,000
Retail | Education | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 1,000,000
Retail | Education | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Education | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Education | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 2,000,000
Retail | Other retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 11,000,000 | $ 11,000,000
Total as a % of Loan Class | 0.22% |
Weighted-Average Interest Rate Reduction |  | 18.68%
Weighted-Average Payment Deferral |  | $ 0
Retail | Other retail | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 8,000,000
Retail | Other retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 1,000,000
Retail | Other retail | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 1,000,000
Retail | Other retail | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 0
Retail | Other retail | Nonaccrual |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis |  | 1,000,000
Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 31,000,000 |
Interest Rate Reduction | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 1,000,000 |
Interest Rate Reduction | Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 1,000,000 |
Interest Rate Reduction | Commercial | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Interest Rate Reduction | Retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 30,000,000 |
Interest Rate Reduction | Retail | Residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 8,000,000 |
Interest Rate Reduction | Retail | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 2,000,000 |
Interest Rate Reduction | Retail | Automobile |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Interest Rate Reduction | Retail | Education |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 9,000,000 |
Interest Rate Reduction | Retail | Other retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 11,000,000 |
Maturity Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 856,000,000 |
Maturity Extension | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 774,000,000 |
Maturity Extension | Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 252,000,000 |
Maturity Extension | Commercial | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 522,000,000 |
Maturity Extension | Retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 82,000,000 |
Maturity Extension | Retail | Residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 77,000,000 |
Maturity Extension | Retail | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 5,000,000 |
Maturity Extension | Retail | Automobile |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Maturity Extension | Retail | Education |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Maturity Extension | Retail | Other retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 103,000,000 |
Payment Delay | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 69,000,000 |
Payment Delay | Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 69,000,000 |
Payment Delay | Commercial | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Payment Delay | Retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 34,000,000 |
Payment Delay | Retail | Residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 3,000,000 |
Payment Delay | Retail | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Payment Delay | Retail | Automobile |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Payment Delay | Retail | Education |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 31,000,000 |
Payment Delay | Retail | Other retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Principal Forgiveness |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Principal Forgiveness | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Principal Forgiveness | Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Amount of Principal Forgiven |  | 0
Principal Forgiveness | Commercial | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Amount of Principal Forgiven |  | 0
Principal Forgiveness | Retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Principal Forgiveness | Retail | Residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Amount of Principal Forgiven |  | 0
Principal Forgiveness | Retail | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Amount of Principal Forgiven |  | 0
Principal Forgiveness | Retail | Automobile |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Amount of Principal Forgiven |  | 0
Principal Forgiveness | Retail | Education |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Amount of Principal Forgiven |  | 0
Principal Forgiveness | Retail | Other retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Amount of Principal Forgiven |  | $ 5,000,000
Interest Rate Reduction and Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 99,000,000 |
Interest Rate Reduction and Term Extension | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 71,000,000 |
Interest Rate Reduction and Term Extension | Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 1,000,000 |
Interest Rate Reduction and Term Extension | Commercial | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 70,000,000 |
Interest Rate Reduction and Term Extension | Retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 28,000,000 |
Interest Rate Reduction and Term Extension | Retail | Residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 20,000,000 |
Interest Rate Reduction and Term Extension | Retail | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 8,000,000 |
Interest Rate Reduction and Term Extension | Retail | Automobile |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Interest Rate Reduction and Term Extension | Retail | Education |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Interest Rate Reduction and Term Extension | Retail | Other retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Term Extension and Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 4,000,000 |
Term Extension and Payment Delay | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 3,000,000 |
Term Extension and Payment Delay | Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 2,000,000 |
Term Extension and Payment Delay | Commercial | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 1,000,000 |
Term Extension and Payment Delay | Retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 1,000,000 |
Term Extension and Payment Delay | Retail | Residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 1,000,000 |
Term Extension and Payment Delay | Retail | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Term Extension and Payment Delay | Retail | Automobile |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Term Extension and Payment Delay | Retail | Education |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | 0 |
Term Extension and Payment Delay | Retail | Other retail |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 0 |

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- Definition Amount of increase (decrease) in amortized cost excluding accrued interest, of financing receivable modified for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 + Details
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- Definition Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A + Details
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