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COMMITMENTS AND CONTINGENT LIABILITIES - Commitments to Extend Credit (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Commercial and industrial |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract amount represents credit risk | $ 42,656 | $ 37,422
Consumer loan portfolio |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract amount represents credit risk | 20,909 | 19,993
Commercial real estate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract amount represents credit risk | 2,646 | 2,089
Standby letters of credit and guarantees on industrial revenue bonds |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract amount represents credit risk | $ 802 | $ 725

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