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GOODWILL, INTANGIBLE ASSETS AND OTHER LONG-LIVED ASSETS - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Goodwill |  |  |  |  |  |
Impairment of goodwill | $ 0 | $ 573 |  | $ 0 | $ 1,062 |
Cumulative impairment charges | $ 2,000 |  |  | $ 2,000 |  | $ 2,000
OpenTable And KAYAK |  |  |  |  |  |
Goodwill |  |  |  |  |  |
Impairment of goodwill |  | $ 573 | $ 489 |  |  |

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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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