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RESTRUCTURING AND OTHER COSTS - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 06, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2020 | Nov. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring costs and asset impairment charges |  | $ 123 | $ 128 | $ 262 |  |
Restructuring and related cost, accelerated depreciation |  | 14 | 3 | 11 |  |
Severance costs |  | 23 | 37 | 25 |  |
Impairment of intangible assets |  | 39 | 9 |  |  |
Other asset impairment charges |  | 8 |  |  |  |
Fixed asset impairment |  | 3 | 33 | 0 |  |
Asset impairment charges |  |  |  | 179 |  |
Restructuring incurred cost |  | 59 |  |  |  |
Inventory write-down |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring costs and asset impairment charges |  | 31 | $ 20 | $ 13 |  |
Restructuring incurred cost |  | 31 |  |  |  |
Restructuring and other costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cost |  |  |  |  | $ 375 | $ 275
Accelerated depreciation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring incurred cost |  | 14 |  |  |  |
Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring incurred cost |  | $ 9 |  |  |  |
Traditional Orthodontics Business And Portions Of Laboratory Business | Technologies And Equipment And Consumables Segments | Minimum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cost | $ 70 |  |  |  |  |
Restructuring and related cost, number of positions eliminated, period percent | 4.00% |  |  |  |  |
Traditional Orthodontics Business And Portions Of Laboratory Business | Technologies And Equipment And Consumables Segments | Maximum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cost | $ 80 |  |  |  |  |
Restructuring and related cost, number of positions eliminated, period percent | 5.00% |  |  |  |  |

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