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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, 2026
Mar. 31, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net charge-offs $ 138 $ 200      
Credit provision 140 153      
Increase to allowance for credit loss 2        
Loans held for sale 1,537   $ 1,537 $ 1,198  
Loans and leases 143,667   143,667 142,692  
Mortgage loans collateralized by OREO 313   313 307  
Amortized cost basis 384 491 1,837   $ 1,322
Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net charge-offs 65 119      
Loans held for sale 778   778 895  
Loans and leases 69,078   69,078 68,880  
Amortized cost basis 38 35 170   142
Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net charge-offs 73 81      
Loans held for sale 759   759 303  
Loans and leases 74,589   74,589 73,812  
Amortized cost basis 346 456 1,667   1,180
Commercial and industrial | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases 50,307   50,307 49,232  
Amortized cost basis 146 176 508   382
Unfunded loan commitment          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 19     465  
Education Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net charge-offs       25  
Loans held for sale   $ 1,900     $ 1,900
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases 458   458 437  
Collateral Dependent | Commercial and industrial | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases $ 244   $ 244 $ 251