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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Net charge-offs $ 181 $ 133    
Credit provision 171 168    
Decrease to ACL (10)      
Loans and leases 143,188   $ 143,188 $ 145,959
Mortgage loans collateralized by OREO 328   328 336
Amortized cost basis 769 184 1,463  
Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Net charge-offs 96 81    
Loans and leases 70,365   70,365 71,514
Amortized cost basis 78 32 211  
Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Net charge-offs 85 52    
Loans and leases 72,823   72,823 74,445
Amortized cost basis 691 152 1,252  
Commercial and industrial | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases 43,951   43,951 44,974
Amortized cost basis 183 $ 97 373  
Unfunded loan commitment        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 32     221
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases 542   542 556
Collateral Dependent | Commercial and industrial | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases $ 339   $ 339 $ 233