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INTANGIBLE ASSETS AND GOODWILL - Schedule of Goodwill (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2020 | Oct. 01, 2019 | Oct. 01, 2018 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | $ 13,126,000,000 | $ 13,126,000,000 | $ 13,142,000,000 | $ 15,593,000,000
Impairments |  | $ 0 |  |  |  |  |  |
Acquisition of certain assets of Synergy |  |  |  |  |  |  | 3,000,000 |
Assets held for sale reclassified to goodwill (Note 5) |  |  |  |  |  | 18,000,000 |  |
Goodwill reclassified to assets held for sale |  |  |  |  |  | (217,000,000) | (18,000,000) | (2,000,000)
Foreign exchange and other |  |  |  |  |  | 117,000,000 | (1,000,000) | (127,000,000)
Balance at the end of the period |  |  |  |  |  | 13,044,000,000 | 13,126,000,000 | 13,142,000,000
Ortho Dermatologics Reporting Units |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Impairments | $ 0 |  |  | $ 0 | 0 |  |  | (2,213,000,000)
Dentistry Reporting Unit |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Impairments |  |  | $ (109,000,000) |  |  |  |  | (109,000,000)
Bausch + Lomb/ International |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 5,786,000,000 | 5,786,000,000 | 5,805,000,000 | 6,016,000,000
Realignment of Global Solta reporting unit goodwill |  |  |  |  |  |  |  | (82,000,000)
Assets held for sale reclassified to goodwill (Note 5) |  |  |  |  |  | 18,000,000 |  |
Goodwill reclassified to assets held for sale |  |  |  |  |  | (217,000,000) | (18,000,000) | (2,000,000)
Foreign exchange and other |  |  |  |  |  | 117,000,000 | (1,000,000) | (127,000,000)
Balance at the end of the period |  |  |  |  |  | 5,704,000,000 | 5,786,000,000 | 5,805,000,000
Branded Rx |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 0 | 0 | 0 | 6,631,000,000
Realignment of Global Solta reporting unit goodwill |  |  |  |  |  |  |  | 115,000,000
Realignment of segment goodwill |  |  |  |  |  |  |  | (4,533,000,000)
Balance at the end of the period |  |  |  |  |  | 0 | 0 | 0
Branded Rx | Ortho Dermatologics Reporting Units |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Impairments |  |  |  |  |  |  |  | (2,213,000,000)
U.S. Diversified Products |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 0 | 0 | 0 | 2,946,000,000
Realignment of Global Solta reporting unit goodwill |  |  |  |  |  |  |  | (33,000,000)
Realignment of segment goodwill |  |  |  |  |  |  |  | (2,913,000,000)
Balance at the end of the period |  |  |  |  |  | 0 | 0 | 0
Salix |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 3,159,000,000 | 3,159,000,000 | 3,156,000,000 |
Acquisition of certain assets of Synergy |  |  |  |  |  |  | 3,000,000 |
Realignment of segment goodwill |  |  |  |  |  |  |  | 3,156,000,000
Balance at the end of the period |  |  |  |  |  | 3,159,000,000 | 3,159,000,000 | 3,156,000,000
Ortho Dermatologics |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 1,267,000,000 | 1,267,000,000 | 1,267,000,000 |
Realignment of segment goodwill |  |  |  |  |  |  |  | 1,267,000,000
Balance at the end of the period |  |  |  |  |  | 1,267,000,000 | 1,267,000,000 | 1,267,000,000
Diversified Products |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | $ 2,914,000,000 | 2,914,000,000 | 2,914,000,000 |
Realignment of segment goodwill |  |  |  |  |  |  |  | 3,023,000,000
Balance at the end of the period |  |  |  |  |  | $ 2,914,000,000 | $ 2,914,000,000 | 2,914,000,000
Diversified Products | Dentistry Reporting Unit |  |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |  |
Impairments |  |  |  |  |  |  |  | $ (109,000,000)

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