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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Effect of Cash Flow Hedging on Income Statement (Details) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivative [Line Items]      
Interest Income - Loans and Leases $ 1,996,000,000 $ 1,985,000,000 $ 1,754,000,000
Interest Expense - Short-Term Borrowings 68,000,000 99,000,000 78,000,000
Interest rate contracts      
Derivative [Line Items]      
Amount of gain (loss) reclassified from AOCI into net income 0 0  
Interest rate contracts | Interest Income - Loans and Leases      
Derivative [Line Items]      
Amount of gain (loss) reclassified from AOCI into net income (20,000,000) (47,000,000) (46,000,000)
Interest rate contracts | Interest Expense - Short-Term Borrowings      
Derivative [Line Items]      
Amount of gain (loss) reclassified from AOCI into net income $ 0 $ 7,000,000 $ 22,000,000