| Document and Entity Information | May 24, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 24, 2021 |
| Entity Registrant Name | Bausch Health Companies Inc. |
| Entity Incorporation, State or Country Code | A1 |
| Entity Address, Address Line One | 2150 St. Elzéar Blvd. West |
| Entity Address, City or Town | Laval |
| Entity Address, Country | CA |
| Entity Address, State or Province | QC |
| Entity Address, Postal Zip Code | H7L 4A8 |
| Entity File Number | 001-14956 |
| Entity Tax Identification Number | 98-0448205 |
| City Area Code | 514 |
| Local Phone Number | 744-6792 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, No Par Value |
| Trading Symbol | BHC |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000885590 |
| Document Fiscal Year Focus | 2020 |
| Document Fiscal Period Focus | FY |
| Amendment Flag | false |
