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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Sep. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs $ 192 $ 153 $ 557 $ 438    
Credit provision 172 172 525 516    
Decrease to ACL     (32)      
Loans and leases 141,632   141,632   $ 145,959 $ 141,632
Mortgage loans collateralized by OREO 319   319   336 319
Amortized cost basis 498 408 1,331 944   1,486
Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs 94 83 278 240    
Loans and leases 69,824   69,824   71,514 69,824
Amortized cost basis 54 43 163 108   215
Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Net charge-offs 98 70 279 198    
Loans and leases 71,808   71,808   74,445 71,808
Amortized cost basis 444 365 1,168 836   1,271
Commercial and industrial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases 43,825   43,825   44,974 43,825
Amortized cost basis 104 $ 196 289 $ 344   301
Unfunded loan commitment            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Amortized cost basis     75   221  
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases 529   529   556 529
Collateral Dependent | Commercial and industrial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases $ 607   $ 607   $ 233 $ 607