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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