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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) |  |  |  | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) reporting_unit | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) reporting_unit | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) reporting_unit | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairments, including loss on assets held for sale |  |  |  |  | $ 1,000,000 |  |  | $ 18,000,000 | $ 15,000,000 | $ 213,000,000 |
Impairment of intangible assets |  |  |  |  |  |  |  |  |  | 213,000,000 |
Finite-lived intangible assets |  |  |  |  | 4,326,000,000 |  |  |  | 4,326,000,000 |  | $ 5,250,000,000
Revenues |  |  |  |  | 2,046,000,000 |  |  | 2,111,000,000 | 5,931,000,000 | 6,238,000,000 |
Fair value of reporting value, greater than its carrying value |  | 45.00% | 40.00% |  |  |  |  |  |  |  |
Goodwill impairment |  | $ 0 | $ 0 |  |  |  |  |  | 202,000,000 |  | 469,000,000
Accumulated goodwill impairment charges |  |  |  |  | 4,382,000,000 |  |  |  | 4,382,000,000 |  |
Bausch + Lomb |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  | 3 |  |  |  |  |  |  |
Ortho Dermatologics |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  | $ 0 |  | 469,000,000
Number of reporting units | reporting_unit |  |  |  |  |  |  | 2 |  | 2 |  |
Salix |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 544,000,000 |  |  | $ 527,000,000 | $ 1,509,000,000 | 1,515,000,000 |
Goodwill impairment |  |  |  |  |  |  |  |  | $ 0 |  | 0
Reporting Units Excluding Ortho Dermatologics |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | 0
Ortho Dermatologics Reporting Unit |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate | 1.00% |  | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% |  | 1.00% |  |
Reporting unit, impairment test, estimated cash flows, discount rate | 9.00% |  |  | 10.00% | 10.50% | 10.00% | 9.00% |  | 10.50% |  |
Fair value of reporting value, greater than its carrying value | 10.00% |  |  |  |  |  | 2.00% |  |  |  |
Goodwill impairment | $ 0 |  | $ 469,000,000 |  | $ 119,000,000 | $ 83,000,000 | $ 0 |  |  |  |
Reporting unit, impairment test, estimated cash flows, change in discount rate |  |  |  | 1.00% |  | 1.00% |  |  |  |  |
Vision Care, Surgical And Ophthalmic Reporting Units | Bausch + Lomb |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of reporting value, greater than its carrying value |  |  |  | 25.00% |  | 25.00% |  |  |  |  |
Goodwill impairment |  |  |  | $ 0 |  |  |  |  |  |  |
All Reporting Units, Excluding Ortho Dermatologics, Vision Care, Surgical and Ophthalmic |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  | $ 0 |  |  |  |  |
Salix Reporting Unit |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  |  |  |  | 2.50% |  |  |  | 2.50% |  |
Fair value of reporting value, greater than its carrying value |  |  |  |  | 5.00% |  |  |  | 5.00% |  |
Goodwill impairment |  |  |  |  | $ 0 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  | 2.00% | 1.00% |  |  |  |  |  |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  | 7.00% | 11.00% |  |  |  |  |  |  |  |
Minimum | Ortho Dermatologics Reporting Unit |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  | 9.00% |  |  |  |  |  |  |  |
Minimum | Vision Care, Surgical And Ophthalmic Reporting Units | Bausch + Lomb |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  |  |  | 2.00% |  | 2.00% |  |  |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  |  | 9.00% |  | 9.00% |  |  |  |  |
Minimum | Salix Reporting Unit |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  |  |  | 9.75% |  |  |  | 9.75% |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  | 3.00% | 3.00% |  |  |  |  |  |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  | 10.00% | 12.25% |  |  |  |  |  |  |  |
Maximum | Ortho Dermatologics Reporting Unit |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  | 10.00% |  |  |  |  |  |  |  |
Maximum | Vision Care, Surgical And Ophthalmic Reporting Units | Bausch + Lomb |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, long-term growth rate |  |  |  | 3.00% |  | 3.00% |  |  |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  |  | 11.50% |  | 11.50% |  |  |  |  |
Maximum | Salix Reporting Unit |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting unit, impairment test, estimated cash flows, discount rate |  |  |  |  | 10.00% |  |  |  | 10.00% |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  |  | 88,000,000 |
Xifaxan Branded Products |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  | $ 0 |  |
Finite-lived intangible assets |  |  |  |  | $ 2,828,000,000 |  |  |  | $ 2,828,000,000 |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  |  | 63 months |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,216,000,000 | 1,194,000,000 |
Finite lived intangible assets, annual amortization expense |  |  |  |  |  |  |  |  | $ 539,000,000 |  |
Xifaxan Branded Products | Salix | Revenue from Contract with Customer, Segment Benchmark | Product Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 80.00% |  |  |  | 80.00% |  |
Product brands |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  | $ 10,000,000 | 105,000,000 |
Finite-lived intangible assets |  |  |  |  | $ 3,846,000,000 |  |  |  | 3,846,000,000 |  | $ 4,673,000,000
Discontinued Product Lines |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 20,000,000 |

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