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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Modified (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 384 $ 491 $ 1,837 $ 1,322
Total as a % of Loan Class 0.27% 0.36%    
Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     1,238 772
30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     180 56
60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     56 5
90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     54 20
Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     309 469
Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 346 $ 456 1,667 1,180
Total as a % of Loan Class 0.46% 0.65%    
Commercial | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     1,165 691
Commercial | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     174 50
Commercial | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     51 0
Commercial | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     20 3
Commercial | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     257 436
Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 146 $ 176 508 382
Total as a % of Loan Class 0.29% 0.40%    
Weighted-Average Interest Rate Reduction 2.54% 0.81%    
Weighted-Average Term Extension (in Months) 21 months 10 months    
Weighted-Average Payment Deferral $ 1 $ 0    
Commercial | Commercial and industrial | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     402 311
Commercial | Commercial and industrial | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     80 17
Commercial | Commercial and industrial | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     0 0
Commercial | Commercial and industrial | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     0 3
Commercial | Commercial and industrial | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     26 51
Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 200 $ 280 1,159 798
Total as a % of Loan Class 0.82% 1.05%    
Weighted-Average Interest Rate Reduction 0.00% 0.75%    
Weighted-Average Term Extension (in Months) 12 months 10 months    
Weighted-Average Payment Deferral $ 2 $ 1    
Commercial | Commercial real estate | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     763 380
Commercial | Commercial real estate | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     94 33
Commercial | Commercial real estate | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     51 0
Commercial | Commercial real estate | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     20 0
Commercial | Commercial real estate | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     231 385
Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 38 $ 35 170 142
Total as a % of Loan Class 0.06% 0.05%    
Retail | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     73 81
Retail | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     6 6
Retail | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     5 5
Retail | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     34 17
Retail | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     52 33
Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 22 $ 23 105 94
Total as a % of Loan Class 0.06% 0.07%    
Weighted-Average Interest Rate Reduction 0.80% 0.98%    
Weighted-Average Term Extension (in Months) 115 months 111 months    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Residential mortgages | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     41 51
Retail | Residential mortgages | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     4 4
Retail | Residential mortgages | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     4 3
Retail | Residential mortgages | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     34 17
Retail | Residential mortgages | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     22 19
Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 8 $ 4 36 22
Total as a % of Loan Class 0.04% 0.02%    
Weighted-Average Interest Rate Reduction 2.90% 4.55%    
Weighted-Average Term Extension (in Months) 188 months 74 months    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Home equity | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     8 9
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 1
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     28 12
Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 2 $ 2 11 9
Total as a % of Loan Class 0.02% 0.02%    
Weighted-Average Interest Rate Reduction 4.40% 4.96%    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Education | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     10 8
Retail | Education | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     0 0
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     1 1
Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 6 $ 6 18 17
Total as a % of Loan Class 0.15% 0.14%    
Weighted-Average Interest Rate Reduction 19.42% 20.30%    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Other retail | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     14 13
Retail | Other retail | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis     2 2
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 9 52    
Interest Rate Reduction | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 42    
Interest Rate Reduction | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 32    
Interest Rate Reduction | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 10    
Interest Rate Reduction | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 8 10    
Interest Rate Reduction | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 1    
Interest Rate Reduction | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 1    
Interest Rate Reduction | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 2 2    
Interest Rate Reduction | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 6 6    
Term Extension        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 221 328    
Term Extension | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 209 313    
Term Extension | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 78 141    
Term Extension | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 131 172    
Term Extension | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 12 15    
Term Extension | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 12 15    
Term Extension | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Payment Delay        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 91 79    
Payment Delay | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 81 75    
Payment Delay | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 45 2    
Payment Delay | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 36 73    
Payment Delay | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 10 4    
Payment Delay | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 6 2    
Payment Delay | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 4 2    
Payment Delay | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Payment Delay | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Principal Forgiveness | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amount of Principal Forgiven 4 2    
Interest Rate Reduction and Term Extension        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 8 5    
Interest Rate Reduction and Term Extension | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 0    
Interest Rate Reduction and Term Extension | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 0    
Interest Rate Reduction and Term Extension | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Interest Rate Reduction and Term Extension | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 7 5    
Interest Rate Reduction and Term Extension | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 3 4    
Interest Rate Reduction and Term Extension | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 4 1    
Interest Rate Reduction and Term Extension | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Interest Rate Reduction and Term Extension | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 55 27    
Term Extension and Payment Delay | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 54 26    
Term Extension and Payment Delay | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 21 1    
Term Extension and Payment Delay | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 33 25    
Term Extension and Payment Delay | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 1    
Term Extension and Payment Delay | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 1    
Term Extension and Payment Delay | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 0 $ 0