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SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenues $ 2,100 $ 1,664 $ 4,127 $ 3,676
Pharmaceuticals        
Disaggregation of Revenue [Line Items]        
Revenues 938 785 1,834 1,724
Devices        
Disaggregation of Revenue [Line Items]        
Revenues 470 262 924 654
OTC        
Disaggregation of Revenue [Line Items]        
Revenues 363 317 706 666
Branded and Other Generics        
Disaggregation of Revenue [Line Items]        
Revenues 305 273 615 579
Other revenues        
Disaggregation of Revenue [Line Items]        
Revenues 24 27 48 53
Bausch + Lomb        
Disaggregation of Revenue [Line Items]        
Revenues 934 677 1,815 1,552
Bausch + Lomb | Pharmaceuticals        
Disaggregation of Revenue [Line Items]        
Revenues 134 96 259 234
Bausch + Lomb | Devices        
Disaggregation of Revenue [Line Items]        
Revenues 397 220 779 561
Bausch + Lomb | OTC        
Disaggregation of Revenue [Line Items]        
Revenues 329 295 645 616
Bausch + Lomb | Branded and Other Generics        
Disaggregation of Revenue [Line Items]        
Revenues 68 57 119 125
Bausch + Lomb | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenues 6 9 13 16
Salix        
Disaggregation of Revenue [Line Items]        
Revenues 516 404 988 881
Salix | Pharmaceuticals        
Disaggregation of Revenue [Line Items]        
Revenues 514 403 984 880
Salix | Devices        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Salix | OTC        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Salix | Branded and Other Generics        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Salix | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenues 2 1 4 1
International Rx        
Disaggregation of Revenue [Line Items]        
Revenues 313 249 619 540
International Rx | Pharmaceuticals        
Disaggregation of Revenue [Line Items]        
Revenues 67 55 126 121
International Rx | Devices        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
International Rx | OTC        
Disaggregation of Revenue [Line Items]        
Revenues 32 20 57 46
International Rx | Branded and Other Generics        
Disaggregation of Revenue [Line Items]        
Revenues 206 161 418 349
International Rx | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenues 8 13 18 24
Ortho Dermatologics        
Disaggregation of Revenue [Line Items]        
Revenues 137 117 278 248
Ortho Dermatologics | Pharmaceuticals        
Disaggregation of Revenue [Line Items]        
Revenues 59 70 124 146
Ortho Dermatologics | Devices        
Disaggregation of Revenue [Line Items]        
Revenues 73 42 145 93
Ortho Dermatologics | OTC        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Ortho Dermatologics | Branded and Other Generics        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Ortho Dermatologics | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenues 5 5 9 9
Diversified Products        
Disaggregation of Revenue [Line Items]        
Revenues 200 217 427 455
Diversified Products | Pharmaceuticals        
Disaggregation of Revenue [Line Items]        
Revenues 164 161 341 343
Diversified Products | Devices        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Diversified Products | OTC        
Disaggregation of Revenue [Line Items]        
Revenues 2 2 4 4
Diversified Products | Branded and Other Generics        
Disaggregation of Revenue [Line Items]        
Revenues 31 55 78 105
Diversified Products | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenues $ 3 $ (1) $ 4 $ 3