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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details)								2 Months Ended	3 Months Ended					12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Oct. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($) reporting_unit	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Asset, Finite Lived, Statement of Income or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag														impairments		impairments
Asset impairments														$ 29,000,000	$ 54,000,000	$ 15,000,000
Finite-lived intangible assets	$ 3,753,000,000	$ 4,753,000,000							$ 3,753,000,000	$ 4,753,000,000				3,753,000,000	4,753,000,000
Goodwill impairments															493,000,000
Goodwill	11,087,000,000	11,183,000,000		$ 11,547,000,000					11,087,000,000	11,183,000,000				11,087,000,000	11,183,000,000	11,547,000,000
Accumulated goodwill impairment charges to date	5,497,000,000								5,497,000,000					5,497,000,000
Salix
Finite-Lived Intangible Assets [Line Items]
Goodwill impairments															0
Goodwill	3,159,000,000	$ 3,159,000,000		$ 3,159,000,000					3,159,000,000	$ 3,159,000,000				3,159,000,000	$ 3,159,000,000	$ 3,159,000,000
Bausch + Lomb
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reporting_unit								3
Dermatology Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates					1.00%	1.00%	1.00%	1.00%			0.00%		1.00%
Reporting unit, impairment test, estimated cash flows, discount rate					10.50%	10.00%	9.00%	10.00%			10.75%		10.50%
Percentage of fair value in excess of carrying value							2.00%
Goodwill impairments						$ 83,000,000	$ 0				$ 151,000,000		$ 119,000,000
Reporting unit, impairment test, estimated cash flows, change in discount rate						1.00%		1.00%
Goodwill	$ 329,000,000				$ 480,000,000				$ 329,000,000		$ 329,000,000		$ 480,000,000	$ 329,000,000
Dermatology Reporting Unit | Bausch + Lomb
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates	0.00%								0.00%					0.00%
Reporting unit, impairment test, estimated cash flows, discount rate	9.50%								9.50%					9.50%
Percentage of fair value in excess of carrying value	50.00%								50.00%					50.00%
Goodwill impairments									$ 0
Vision Care, Surgical and Pharmaceuticals Reporting Units | Bausch + Lomb
Finite-Lived Intangible Assets [Line Items]
Percentage of fair value in excess of carrying value			25.00%	25.00%		25.00%		25.00%								25.00%
Goodwill impairments			$ 0	$ 0				$ 0
Vision Care, Surgical and Pharmaceuticals Reporting Units | Bausch + Lomb | Minimum
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates			2.00%	2.00%		2.00%		2.00%								2.00%
Reporting unit, impairment test, estimated cash flows, discount rate			10.25%	9.50%		9.00%		9.00%								9.50%
Vision Care, Surgical and Pharmaceuticals Reporting Units | Bausch + Lomb | Maximum
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates			3.00%	3.00%		3.00%		3.00%								3.00%
Reporting unit, impairment test, estimated cash flows, discount rate			11.50%	12.25%		11.50%		11.50%								12.25%
Salix Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates					2.50%								2.50%
Percentage of fair value in excess of carrying value					5.00%								5.00%
Goodwill impairments					$ 0
Salix Reporting Unit | Minimum
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, estimated cash flows, discount rate					9.75%								9.75%
Salix Reporting Unit | Maximum
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, estimated cash flows, discount rate					10.00%								10.00%
Neurology Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates				(2.50%)							(2.50%)					(2.50%)
Reporting unit, impairment test, estimated cash flows, discount rate				10.25%							10.50%					10.25%
Goodwill impairments				$ 622,000,000							$ 251,000,000
Goodwill				$ 1,439,000,000							$ 1,192,000,000					$ 1,439,000,000
Generics Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates		1.00%								1.00%					1.00%
Reporting unit, impairment test, estimated cash flows, discount rate		10.25%								10.25%					10.25%
Goodwill impairments										$ 91,000,000
Goodwill	$ 227,000,000	$ 227,000,000							$ 227,000,000	$ 227,000,000				$ 227,000,000	$ 227,000,000
Generics Reporting Unit | Bausch + Lomb
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates	1.00%								1.00%					1.00%
Reporting unit, impairment test, estimated cash flows, discount rate	8.50%								8.50%					8.50%
Percentage of fair value in excess of carrying value	50.00%								50.00%					50.00%
Goodwill impairments									$ 0
International Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Reporting unit, impairment test, long-term growth rates		3.00%								3.00%					3.00%
Reporting unit, impairment test, estimated cash flows, discount rate		12.75%								12.75%					12.75%
Percentage of fair value in excess of carrying value		75.00%								75.00%					75.00%
Goodwill impairments		$ 0
Trade Names No Longer Used
Finite-Lived Intangible Assets [Line Items]
Impairment of finite-lived intangible assets															$ 8,000,000
Discontinued Product Lines
Finite-Lived Intangible Assets [Line Items]
Impairment of finite-lived intangible assets															9,000,000	5,000,000
Product brands
Finite-Lived Intangible Assets [Line Items]
Impairment of finite-lived intangible assets														$ 24,000,000		$ 10,000,000
Finite-lived intangible assets	$ 3,420,000,000	4,336,000,000							$ 3,420,000,000	$ 4,336,000,000				$ 3,420,000,000	4,336,000,000
Weighted- Average Remaining Useful Lives (Years)	2 years								2 years					2 years
Product brands | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Lives (Years)	2 years								2 years					2 years
Product brands | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Lives (Years)	20 years								20 years					20 years
Uceris Foam
Finite-Lived Intangible Assets [Line Items]
Impairment of finite-lived intangible assets												$ 37,000,000			37,000,000
Finite-lived intangible assets		$ 0								$ 0					$ 0
Xifaxan Branded Products
Finite-Lived Intangible Assets [Line Items]
Impairment of finite-lived intangible assets	$ 0				$ 0
Finite-lived intangible assets	$ 1,616,000,000								$ 1,616,000,000					$ 1,616,000,000
Weighted- Average Remaining Useful Lives (Years)	36 months								36 months					36 months
Xifaxan Branded Products | Revenue from Contract with Customer, Segment Benchmark | Product Concentration Risk | Salix
Finite-Lived Intangible Assets [Line Items]
Concentration risk, percentage														85.00%

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