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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Effect of Cash Flow Hedging on Income Statement (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative [Line Items]        
Interest Income - Loans and Leases $ 511,000,000 $ 516,000,000 $ 1,492,000,000 $ 1,491,000,000
Interest Expense - Short-Term Borrowings $ 18,000,000 $ 30,000,000 52,000,000 90,000,000
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     (19,000,000) (37,000,000)
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