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BUSINESS COMBINATIONS - SUMMARY OF INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | Dec. 31, 2020 | May 01, 2018
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Straight Smile LLC |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired, amount | $ 416 |
OraMetrix, Inc. |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired, amount |  | $ 97
Tradenames and trademarks | OraMetrix, Inc. |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets acquired, amount |  | 14
Non-compete agreements | Straight Smile LLC |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired, amount | $ 16 |
Weighted average useful life (in years) | 5 years |
Technology know-how | Straight Smile LLC |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired, amount | $ 210 |
Weighted average useful life (in years) | 10 years |
Customer relationships | OraMetrix, Inc. |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired, amount |  | $ 18
Weighted average useful life (in years) |  | 15 years
Developed technology and patents | OraMetrix, Inc. |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired, amount |  | $ 65
Weighted average useful life (in years) |  | 15 years
Tradenames and trademarks | Straight Smile LLC |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired, amount | $ 190 |
Weighted average useful life (in years) | 20 years |

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