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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Basis Adjustments for Hedged Items) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items | $ 29.0 |
Investment securities | 10,406.0 | $ 10,601.0
Amount of hedging | 4,500.0 |
Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Investment securities | 9,800.0 |
Fair Value Hedging | Hedges of fixed-rate assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Par value of hedged items | 11,473.0 | 11,388.0
Carrying amount of hedged assets | 11,299.0 | 11,099.0
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items | (174.0) | (289.0)
Fair Value Hedging | Hedges of fixed-rate liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Par value of hedged liabilities | (500.0) | (500.0)
Carrying amount of hedged liabilities | (509.0) | (493.0)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items | $ (9.0) | $ 7.0

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