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INTANGIBLE ASSETS AND GOODWILL - Changes in Carrying Amount of Goodwill (Details) - USD ($) |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Change in the carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | $ 13,044,000,000 | $ 13,126,000,000
Assets held for sale reclassified to goodwill |  |  |  | 18,000,000
Goodwill reclassified to Assets held for sale (Note 4) |  |  |  | (217,000,000)
Realignment of segment goodwill |  |  | 0 |
Impairment | $ 0 | $ 0 | (469,000,000) |
Foreign exchange and other |  |  | (98,000,000) | 117,000,000
Balance at the end of the period |  |  | 12,477,000,000 | 13,044,000,000
Bausch + Lomb/ International |  |  |  |
Change in the carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 5,704,000,000 | 5,786,000,000
Assets held for sale reclassified to goodwill |  |  |  | 18,000,000
Goodwill reclassified to Assets held for sale (Note 4) |  |  |  | (217,000,000)
Realignment of segment goodwill |  |  | (5,704,000,000) |
Foreign exchange and other |  |  |  | 117,000,000
Balance at the end of the period |  |  | 0 | 5,704,000,000
Bausch + Lomb |  |  |  |
Change in the carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 0 |
Realignment of segment goodwill |  |  | 5,395,000,000 |
Foreign exchange and other |  |  | (59,000,000) |
Balance at the end of the period |  |  | 5,336,000,000 | 0
Salix |  |  |  |
Change in the carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 3,159,000,000 | 3,159,000,000
Balance at the end of the period |  |  | 3,159,000,000 | 3,159,000,000
International Rx |  |  |  |
Change in the carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 0 |
Realignment of segment goodwill |  |  | 887,000,000 |
Foreign exchange and other |  |  | (53,000,000) |
Balance at the end of the period |  |  | 834,000,000 | 0
Ortho Dermatologics |  |  |  |
Change in the carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 1,267,000,000 | 1,267,000,000
Impairment |  |  | (469,000,000) |
Balance at the end of the period |  |  | 798,000,000 | 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
Realignment of segment goodwill |  |  | (578,000,000) |
Foreign exchange and other |  |  | 14,000,000 |
Balance at the end of the period |  |  | $ 2,350,000,000 | $ 2,914,000,000

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