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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Oct. 01, 2023 | Dec. 31, 2022
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  | $ 0 | $ 4,000,000 |  | $ 6,000,000 | $ 54,000,000 |  |  |
Finite-lived intangible assets | $ 3,949,000,000 | $ 4,753,000,000 |  | 3,949,000,000 |  |  | 3,949,000,000 |  | $ 4,753,000,000 |  |
Goodwill impairment |  |  |  |  |  |  |  |  | 493,000,000 |  |
Goodwill | 11,171,000,000 | $ 11,183,000,000 |  | 11,171,000,000 |  |  | 11,171,000,000 |  | $ 11,183,000,000 |  | $ 11,547,000,000
Accumulated goodwill impairment charges | 5,497,000,000 |  |  | 5,497,000,000 |  |  | 5,497,000,000 |  |  |  |
Dermatology Reporting Unit | Bausch + Lomb |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  |  |  |  | 0.00% |  |  | 0.00% |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  |  |  | 10.75% |  |  | 10.75% |  |  |
Goodwill impairment |  |  |  |  | $ 151,000,000 |  |  |  |  |  |
Goodwill | 329,000,000 |  |  | 329,000,000 | $ 329,000,000 |  | 329,000,000 | $ 329,000,000 |  |  |
Neurology Reporting Unit | Bausch + Lomb |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  |  |  |  | (2.50%) |  |  | (2.50%) |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  |  |  | 10.50% |  |  | 10.50% |  |  |
Goodwill impairment |  |  |  |  | $ 251,000,000 |  |  |  |  |  |
Goodwill | 1,175,000,000 |  |  | 1,175,000,000 | $ 1,192,000,000 |  | 1,175,000,000 | $ 1,192,000,000 |  |  |
International Reporting Unit |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value in excess of carrying value (more than) |  |  |  |  |  |  |  |  |  | 75.00% |
Vision Care, Surgical and Pharmaceuticals Reporting Units | Bausch + Lomb |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value in excess of carrying value (more than) |  |  |  |  |  |  |  |  |  | 25.00% |
Generics Reporting Unit |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  | 1.00% |  |  |  |  |  |  | 1.00% |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  | 10.25% |  |  |  |  |  |  | 10.25% |  |
Goodwill impairment |  | $ 91,000,000 |  |  |  |  |  |  |  |  |
Goodwill | 227,000,000 | 227,000,000 |  | 227,000,000 |  |  | 227,000,000 |  | $ 227,000,000 |  |
Uceris Foam |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  | $ 37,000,000 |  | 37,000,000 |  |  |
Finite-lived intangible assets |  | $ 0 |  |  |  |  |  |  | $ 0 |  |
Xifaxan Branded Products |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets | 0 |  | $ 0 |  |  |  |  |  |  |  |
Finite-lived intangible assets | $ 1,751,000,000 |  |  | $ 1,751,000,000 |  |  | $ 1,751,000,000 |  |  |  |
Finite lived intangible assets, useful life | 39 months |  |  | 39 months |  |  | 39 months |  |  |  |
Trade Names No Longer Used |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  | 8,000,000 |  |  |
Discontinued Product Lines |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  | $ 9,000,000 |  |  |

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