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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
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs $ 184 $ 152 $ 365 $ 285    
Credit provision 182 176 353 344    
Decrease to ACL     (12)      
Loans and leases 141,842   141,842   $ 141,842 $ 145,959
Mortgage loans collateralized by OREO 317   317   317 336
Amortized cost basis 721 461 1,233 617 1,550  
Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs 88 76 184 157    
Loans and leases 69,908   69,908   69,908 71,514
Amortized cost basis 56 37 120 67 215  
Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs 96 76 181 128    
Loans and leases 71,934   71,934   71,934 74,445
Amortized cost basis 665 424 1,113 550 1,335  
Commercial and industrial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases 43,623   43,623   43,623 44,974
Amortized cost basis 198 $ 125 321 $ 214 426  
Unfunded loan commitment            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis     73     221
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases 530   530   530 556
Collateral Dependent | Commercial and industrial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases $ 404   $ 404   $ 404 $ 233