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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