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FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward - Narrative (Details) - Long-term debt - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |
Transfers into Level 3, liabilities | $ 726 | $ 636 | $ 1,966 | $ 3,674
Transfers out of Level 3, liabilities | $ 889 | $ 857 | $ 2,954 | $ 22,587

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