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FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option-Changes in Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Recurring |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Net gains (losses) from fair value changes | $ 1 | $ 5 | $ 16 | $ 2
Loans held for investment | Fair Value, Recurring |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Net gains (losses) from fair value changes | 0 | 0 | (1) | (1)
Long-term debt | Fair Value, Recurring |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Net gains (losses) from fair value changes | $ 0 | $ (3) | $ (5) | $ (5)

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