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GOODWILL AND INTANGIBLE ASSETS - GOODWILL BY REPORTABLE SEGMENT (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Balance, beginning of the year | $ 3,397,000,000 | $ 3,431,000,000 |
Acquisition activity | 631,000,000 | 3,000,000 |
Divestiture of business |  | (4,000,000) |
Impairment | (157,000,000) | 0 | $ (1,086,000,000)
Effect of exchange rate changes | 115,000,000 | (33,000,000) |
Balance, end of the year | 3,986,000,000 | 3,397,000,000 | 3,431,000,000
Technologies & Equipment |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of the year | 2,516,000,000 | 2,545,000,000 |
Acquisition activity | 631,000,000 | 3,000,000 |
Divestiture of business |  | (4,000,000) |
Impairment | (157,000,000) |  | (1,086,000,000)
Effect of exchange rate changes | 102,000,000 | (28,000,000) |
Balance, end of the year | 3,092,000,000 | 2,516,000,000 | 2,545,000,000
Consumables |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of the year | 881,000,000 | 886,000,000 |
Acquisition activity | 0 | 0 |
Divestiture of business |  | 0 |
Impairment | 0 |  |
Effect of exchange rate changes | 13,000,000 | (5,000,000) |
Balance, end of the year | $ 894,000,000 | $ 881,000,000 | $ 886,000,000

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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