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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs $ 200 $ 181        
Credit provision 153 171        
Decrease to ACL (47)          
Loans held for sale 2,820     $ 2,820   $ 858
Loans and leases 137,635     137,635   139,203
Mortgage loans collateralized by OREO 302     302   295
Amortized cost basis 491 769   1,322 $ 1,463  
Non-Core            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs 25          
Loans held for sale 1,900     1,900    
Proceeds from sale of loans held for sale 200          
Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs 119 96        
Loans held for sale 922     922   633
Loans and leases 67,127     67,127   69,427
Amortized cost basis 35 78   142 211  
Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs 81 85        
Loans held for sale 254     254   225
Loans and leases 70,508     70,508   69,776
Amortized cost basis 456 691   1,180 1,252  
Commercial and industrial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases 43,781     43,781   42,551
Amortized cost basis 176 $ 183   382 $ 373  
Unfunded loan commitment            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis 157   $ 206      
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases 397     397   372
Collateral Dependent | Commercial and industrial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases $ 513     $ 513   $ 607