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GOODWILL AND INTANGIBLE ASSETS - ADDITIONAL INFORMATION (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 reporting_unit | Dec. 31, 2018 USD ($) reporting_unit | Mar. 31, 2020 USD ($) reporting_unit | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) reporting_unit | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |
Number of reporting units | reporting_unit | 5 | 11 | 5 |  | 5 |  |
Goodwill |  | $ 3,431,000,000 |  |  | $ 3,986,000,000 | $ 3,397,000,000 | $ 3,431,000,000
Impairment |  |  |  |  | 157,000,000 | 0 | 1,086,000,000
Indefinite-lived intangible asset impairment |  |  |  | $ 5,000,000 | 39,000,000 | 5,000,000 | 179,000,000
Amortization of intangible assets |  |  |  |  | 192,000,000 | 190,000,000 | 198,000,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
2021 |  |  |  |  | 216,000,000 |  |
2022 |  |  |  |  | 215,000,000 |  |
2023 |  |  |  |  | 217,000,000 |  |
2024 |  |  |  |  | 219,000,000 |  |
2025 |  |  |  |  | 223,000,000 |  |
Tradenames and trademarks |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Indefinite-lived intangibles, carrying amount |  |  |  |  | $ 642,000,000 | 628,000,000 |
C O V I D19 [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  | 4 |  |  |  |
Minimum |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Indefinite lived intangible asset, discount rate |  |  | 10.00% |  |  |  |
Minimum | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  |  |  |  | 0.090 |  |
Minimum | Measurement Input, Discount Rate [Member] | C O V I D19 [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  |  | 0.095 |  |  |  |
Maximum |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Indefinite lived intangible asset, discount rate |  |  | 17.50% |  |  |  |
Maximum | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  |  |  |  | 0.115 |  |
Maximum | Measurement Input, Discount Rate [Member] | C O V I D19 [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  |  | 0.115 |  |  |  |
Technologies & Equipment |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 2,545,000,000 |  |  | $ 3,092,000,000 | $ 2,516,000,000 | 2,545,000,000
Impairment |  |  |  |  | 157,000,000 |  | $ 1,086,000,000
Equipment And Instruments Reporting Unit | Tradenames and trademarks |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Indefinite-lived intangibles, carrying amount |  |  |  |  | 82,000,000 |  |
Indefinite-lived intangible asset impairment |  |  | $ 39,000,000 |  |  |  |
Equipment And Instruments Reporting Unit | Technologies & Equipment |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | 292,000,000 |  |
Equipment And Instruments Reporting Unit | Technologies & Equipment | C O V I D19 [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Impairment |  |  | $ 157,000,000 |  |  |  |
MIS Implants Technologies Ltd. and Health Consumable Business | Technologies & Equipment |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,232,000,000 |  |

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