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INTANGIBLE ASSETS AND GOODWILL - Schedule of Goodwill (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Oct. 01, 2018 | Jan. 01, 2017 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in the carrying amount of goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 15,794,000,000 |  | $ 13,142,000,000 | $ 15,593,000,000 | $ 15,794,000,000
Acquisition of certain assets of Synergy |  |  |  |  | 3,000,000 |  |
Goodwill reclassified to assets held for sale |  |  |  |  | (18,000,000) | (2,000,000) | (175,000,000)
Impairments | $ 0 |  |  |  | 0 | (2,322,000,000) | (312,000,000)
Realignment of segment goodwill |  |  | 0 |  |  |  |
Foreign exchange and other |  |  |  |  | (1,000,000) | (127,000,000) | 286,000,000
Balance at the end of the period |  |  |  |  | 13,126,000,000 | 13,142,000,000 | 15,593,000,000
Ortho Dermatologics Reporting Unit |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |
Impairments |  |  |  | $ 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 |  |  | 5,499,000,000 |  | 5,805,000,000 | 6,016,000,000 | 5,499,000,000
Realignment of Global Solta reporting unit goodwill |  |  |  |  |  | (82,000,000) |
Goodwill reclassified to assets held for sale |  |  |  |  | (18,000,000) | (2,000,000) | (30,000,000)
Realignment of segment goodwill |  |  | 264,000,000 |  |  |  |
Foreign exchange and other |  |  |  |  | (1,000,000) | (127,000,000) | 283,000,000
Balance at the end of the period |  |  |  |  | 5,786,000,000 | 5,805,000,000 | 6,016,000,000
Branded Rx |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | 7,265,000,000 |  | 0 | 6,631,000,000 | 7,265,000,000
Realignment of Global Solta reporting unit goodwill |  |  |  |  |  | 115,000,000 |
Goodwill reclassified to assets held for sale |  |  |  |  |  |  | (61,000,000)
Impairments |  |  |  |  |  |  | (312,000,000)
Realignment of segment goodwill |  |  | (264,000,000) |  |  | (4,533,000,000) |
Foreign exchange and other |  |  |  |  |  |  | 3,000,000
Balance at the end of the period |  |  |  |  | 0 | 0 | 6,631,000,000
Branded Rx | Ortho Dermatologics Reporting Unit |  |  |  |  |  |  |
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 |  |  | $ 3,030,000,000 |  | 0 | 2,946,000,000 | 3,030,000,000
Realignment of Global Solta reporting unit goodwill |  |  |  |  |  | (33,000,000) |
Goodwill reclassified to assets held for sale |  |  |  |  |  |  | (84,000,000)
Realignment of segment goodwill |  |  |  |  |  | (2,913,000,000) |
Foreign exchange and other |  |  |  |  |  |  | 0
Balance at the end of the period |  |  |  |  | 0 | 0 | $ 2,946,000,000
Salix |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 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 | 3,156,000,000 |
Ortho Dermatologics |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 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 |
Diversified Products |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 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 |
Diversified Products | Dentistry Reporting Unit |  |  |  |  |  |  |
Change in the carrying amount of goodwill |  |  |  |  |  |  |
Impairments |  |  |  |  |  | $ (109,000,000) |

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