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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2022
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]                    
Asset impairments       $ 5,000,000   $ 37,000,000 $ 6,000,000 $ 50,000,000    
Finite-lived intangible assets $ 4,200,000,000 $ 4,753,000,000   4,200,000,000     4,200,000,000   $ 4,753,000,000  
Goodwill impairment                 493,000,000  
Goodwill 11,127,000,000 11,183,000,000   11,127,000,000     11,127,000,000   11,183,000,000 $ 11,547,000,000
Accumulated goodwill impairment charges 5,497,000,000     5,497,000,000     5,497,000,000      
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 $ 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   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 1,188,000,000     1,188,000,000 $ 1,192,000,000   1,188,000,000      
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   $ 227,000,000  
Uceris Foam                    
Goodwill [Line Items]                    
Asset impairments           37,000,000        
Impairment of intangible assets           $ 37,000,000        
Xifaxan Branded Products                    
Goodwill [Line Items]                    
Impairment of intangible assets 0   $ 0              
Finite-lived intangible assets $ 1,885,000,000     $ 1,885,000,000     $ 1,885,000,000      
Finite lived intangible assets, useful life 42 months     42 months     42 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