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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Mar. 31, 2025 | Dec. 31, 2024
Goodwill [Line Items] |  |  |
Finite-lived intangible assets |  | $ 3,499,000,000 | $ 3,753,000,000
Accumulated goodwill impairment charges |  | 5,497,000,000 |
Xifaxan Branded Products |  |  |
Goodwill [Line Items] |  |  |
Finite-lived intangible assets |  | $ 1,481,000,000 |
Finite lived intangible assets, useful life |  | 33 months |
Impairment of intangible assets | $ 0 | $ 0 |

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