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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Basis Adjustments for Hedged Items) (Details) - USD ($) $ in Millions | Sep. 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 | $ 35 |
Investment securities | 10,379 | $ 10,601
Amount of hedging | 5,600 |
Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Investment securities | 9,500 |
Fair Value Hedging | Hedges of fixed-rate assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Par value of hedged items | 11,494 | 11,388
Carrying amount of hedged assets | 11,333 | 11,099
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items | (161) | (289)
Fair Value Hedging | Hedges of fixed-rate liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Par value of hedged liabilities | (1,000) | (500)
Carrying amount of hedged liabilities | (1,012) | (493)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items | $ (12) | $ 7

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