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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2024 | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  |  |  | $ 1,000,000 |  | $ 13,000,000 |  |
Finite-lived intangible assets | $ 4,480,000,000 | $ 4,753,000,000 |  | 4,480,000,000 |  |  | $ 4,753,000,000 |
Goodwill impairment |  |  |  |  |  |  | 493,000,000 |
Goodwill | 11,160,000,000 | 11,183,000,000 |  | 11,160,000,000 |  |  | 11,183,000,000 | $ 11,547,000,000
Accumulated goodwill impairment charges | 5,497,000,000 |  |  | 5,497,000,000 |  |  |  |
Salix |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  | 0 |
Goodwill | 3,159,000,000 | $ 3,159,000,000 |  | 3,159,000,000 |  |  | $ 3,159,000,000 | $ 3,159,000,000
Dermatology Reporting Unit | Bausch + Lomb |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  |  |  |  | 0.00% |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  |  |  | 10.75% |  |  |
Goodwill impairment |  |  |  |  | $ 151,000,000 |  |  |
Goodwill | 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%) |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  |  |  | 10.50% |  |  |
Goodwill impairment |  |  |  |  | $ 251,000,000 |  |  |
Goodwill | 1,186,000,000 |  |  | 1,186,000,000 | $ 1,192,000,000 |  |  |
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 |
Xifaxan Branded Products |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment of intangible assets | 0 |  | $ 0 |  |  |  |  |
Finite-lived intangible assets | $ 2,020,000,000 |  |  | $ 2,020,000,000 |  |  |  |
Finite lived intangible assets, useful life | 45 months |  |  | 45 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 |  |  |  |  |  | $ 5,000,000 |  |

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