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FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details) - Nonrecurring Basis - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Total Gains/(Losses) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Collateral-dependent loans, gains (losses) | $ (14) | $ (4) | $ (57) | $ (45) |
Level 3 | Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Collateral-dependent loans | $ 37 |  | $ 37 |  | $ 192

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