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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Modified (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 718 $ 498 $ 1,396 $ 1,331 $ 1,714 $ 1,486
Total as a % of Loan Class 0.51% 0.35% 0.99% 0.94%    
Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         1,159 931
30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         93 73
60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         9 69
90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         55 16
Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         398 397
Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 667 $ 444 $ 1,283 $ 1,168 1,560 1,271
Total as a % of Loan Class 0.92% 0.62% 1.77% 1.63%    
Commercial | Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         1,081 801
Commercial | 30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         84 65
Commercial | 60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         2 64
Commercial | 90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         39 0
Commercial | Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         354 341
Commercial | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 155 $ 104 $ 350 $ 289 445 301
Total as a % of Loan Class 0.33% 0.24% 0.75% 0.66%    
Weighted-Average Interest Rate Reduction 2.18% 3.62% 1.52% 3.72%    
Weighted-Average Term Extension (in Months) 20 months 14 months 18 months 15 months    
Weighted-Average Payment Deferral $ 0 $ 11 $ 0 $ 3    
Commercial | Commercial and industrial | Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         348 211
Commercial | Commercial and industrial | 30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         1 35
Commercial | Commercial and industrial | 60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         0 1
Commercial | Commercial and industrial | 90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         35 0
Commercial | Commercial and industrial | Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         61 54
Commercial | Commercial real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 512 $ 340 $ 933 $ 879 1,115 970
Total as a % of Loan Class 2.00% 1.22% 3.65% 3.14%    
Weighted-Average Interest Rate Reduction 0.00% 4.31% 0.83% 2.83%    
Weighted-Average Term Extension (in Months) 12 months 9 months 12 months 17 months    
Weighted-Average Payment Deferral $ 5 $ 1 $ 5 $ 1    
Commercial | Commercial real estate | Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         733 590
Commercial | Commercial real estate | 30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         83 30
Commercial | Commercial real estate | 60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         2 63
Commercial | Commercial real estate | 90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         4 0
Commercial | Commercial real estate | Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         293 287
Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 51 $ 54 $ 113 $ 163 154 215
Total as a % of Loan Class 0.07% 0.08% 0.17% 0.23%    
Retail | Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         78 130
Retail | 30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         9 8
Retail | 60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         7 5
Retail | 90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         16 16
Retail | Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         44 56
Retail | Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 31 $ 22 $ 70 $ 86 97 111
Total as a % of Loan Class 0.09% 0.07% 0.20% 0.27%    
Weighted-Average Interest Rate Reduction 1.40% 1.52% 1.27% 1.59%    
Weighted-Average Term Extension (in Months) 107 months 94 months 110 months 92 months    
Weighted-Average Payment Deferral $ 0 $ 0 $ 0 $ 0    
Retail | Residential mortgages | Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         49 73
Retail | Residential mortgages | 30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         7 6
Retail | Residential mortgages | 60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         6 4
Retail | Residential mortgages | 90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         16 16
Retail | Residential mortgages | Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         19 12
Retail | Home equity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 12 $ 7 $ 22 $ 14 30 19
Total as a % of Loan Class 0.07% 0.04% 0.12% 0.09%    
Weighted-Average Interest Rate Reduction 3.01% 4.32% 3.41% 4.03%    
Weighted-Average Term Extension (in Months) 143 months 51 months 121 months 75 months    
Weighted-Average Payment Deferral $ 0 $ 0 $ 0 $ 0    
Retail | Home equity | Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         8 11
Retail | Home equity | 30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         0 0
Retail | Home equity | 60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         0 0
Retail | Home equity | 90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         0 0
Retail | Home equity | Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         22 8
Retail | Education            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 3 $ 20 $ 8 $ 50 10 70
Total as a % of Loan Class 0.04% 0.18% 0.09% 0.45%    
Weighted-Average Interest Rate Reduction 5.22% 4.44% 4.71% 4.42%    
Weighted-Average Term Extension (in Months)   24 months   24 months    
Weighted-Average Payment Deferral $ 0 $ 0 $ 0 $ 0    
Retail | Education | Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         8 34
Retail | Education | 30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         0 1
Retail | Education | 60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         0 0
Retail | Education | 90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         0 0
Retail | Education | Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         2 35
Retail | Other retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 5 $ 5 $ 13 $ 13 17 15
Total as a % of Loan Class 0.12% 0.10% 0.32% 0.27%    
Weighted-Average Interest Rate Reduction 19.89% 20.79% 19.86% 20.23%    
Weighted-Average Payment Deferral $ 0 $ 0 $ 0 $ 0    
Retail | Other retail | Current            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         13 12
Retail | Other retail | 30-59            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         2 1
Retail | Other retail | 60-89            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         1 1
Retail | Other retail | 90+            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         0 0
Retail | Other retail | Nonaccrual            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis         $ 1 $ 1
Interest Rate Reduction            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 12 11 73 29    
Interest Rate Reduction | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 1 0 44 0    
Interest Rate Reduction | Commercial | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 1 0 16 0    
Interest Rate Reduction | Commercial | Commercial real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 0 28 0    
Interest Rate Reduction | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 11 11 29 29    
Interest Rate Reduction | Retail | Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 1 1 3 4    
Interest Rate Reduction | Retail | Home equity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 2 2 5 3    
Interest Rate Reduction | Retail | Education            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 3 3 8 9    
Interest Rate Reduction | Retail | Other retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 5 5 13 13    
Term Extension            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 558 248 1,072 751    
Term Extension | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 539 231 1,029 684    
Term Extension | Commercial | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 151 75 322 179    
Term Extension | Commercial | Commercial real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 388 156 707 505    
Term Extension | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 19 17 43 67    
Term Extension | Retail | Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 18 15 42 63    
Term Extension | Retail | Home equity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 1 1 1 2    
Term Extension | Retail | Education            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 1 0 2    
Term Extension | Retail | Other retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 0 0 0    
Payment Delay            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 34 65 92 234    
Payment Delay | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 22 48 68 186    
Payment Delay | Commercial | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 25 2 86    
Payment Delay | Commercial | Commercial real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 22 23 66 100    
Payment Delay | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 12 17 24 48    
Payment Delay | Retail | Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 6 1 13 9    
Payment Delay | Retail | Home equity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 6 0 11 0    
Payment Delay | Retail | Education            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 16 0 39    
Payment Delay | Retail | Other retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 0 0 0    
Principal Forgiveness | Commercial | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amount of Principal Forgiven 0 0 0 0    
Principal Forgiveness | Commercial | Commercial real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amount of Principal Forgiven 0 0 0 0    
Principal Forgiveness | Retail | Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amount of Principal Forgiven 0 0 0 0    
Principal Forgiveness | Retail | Home equity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amount of Principal Forgiven 0 0 0 0    
Principal Forgiveness | Retail | Education            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amount of Principal Forgiven 0 0 0 0    
Principal Forgiveness | Retail | Other retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amount of Principal Forgiven 6 1 12 5    
Interest Rate Reduction and Term Extension            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 10 76 48 148    
Interest Rate Reduction and Term Extension | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 2 68 34 131    
Interest Rate Reduction and Term Extension | Commercial | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 2 1 5 1    
Interest Rate Reduction and Term Extension | Commercial | Commercial real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 67 29 130    
Interest Rate Reduction and Term Extension | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 8 8 14 17    
Interest Rate Reduction and Term Extension | Retail | Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 5 4 9 8    
Interest Rate Reduction and Term Extension | Retail | Home equity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 3 4 5 9    
Interest Rate Reduction and Term Extension | Retail | Education            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 0 0 0    
Interest Rate Reduction and Term Extension | Retail | Other retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 0 0 0    
Term Extension and Payment Delay            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 102 98 105 168    
Term Extension and Payment Delay | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 102 97 104 167    
Term Extension and Payment Delay | Commercial | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 3 1 23    
Term Extension and Payment Delay | Commercial | Commercial real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 102 94 103 144    
Term Extension and Payment Delay | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 1 1 1    
Term Extension and Payment Delay | Retail | Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 1 1 1    
Term Extension and Payment Delay | Retail | Home equity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 0 0 0    
Term Extension and Payment Delay | Retail | Education            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 0 0 0    
Term Extension and Payment Delay | Retail | Other retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0 $ 0 0 0    
Interest Rate Reduction, Term Extension, and Payment Delay            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 2   6 1    
Interest Rate Reduction, Term Extension, and Payment Delay | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 1   4 0    
Interest Rate Reduction, Term Extension, and Payment Delay | Commercial | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 1   4 0    
Interest Rate Reduction, Term Extension, and Payment Delay | Commercial | Commercial real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0   0 0    
Interest Rate Reduction, Term Extension, and Payment Delay | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 1   2 1    
Interest Rate Reduction, Term Extension, and Payment Delay | Retail | Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 1   2 1    
Interest Rate Reduction, Term Extension, and Payment Delay | Retail | Home equity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0   0 0    
Interest Rate Reduction, Term Extension, and Payment Delay | Retail | Education            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 0   0 0    
Interest Rate Reduction, Term Extension, and Payment Delay | Retail | Other retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis $ 0   $ 0 $ 0