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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Intangible assets, net | $ 961 |  | $ 961 |  | $ 1,382
Intangible assets, accumulated amortization | 1,600 |  | 1,600 |  | 2,100
Intangible assets amortization expense | 53 | $ 55 | 161 | $ 166 |
Goodwill | 2,669 |  | 2,669 |  | 2,799
Cumulative impairment charges | 2,200 |  | 2,200 |  | 2,000
Finite-lived intangible assets |  |  |  |  |
Intangible assets, net | 961 |  | 961 |  | 1,382
Goodwill | 2,669 |  | 2,669 |  | $ 2,799
KAYAK |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Goodwill | 203 |  | 203 |  |
Goodwill, impairment loss | 180 |  | 180 |  |
Impairment of intangible assets | 277 |  | 277 |  |
Finite-lived intangible assets |  |  |  |  |
Goodwill | 203 |  | 203 |  |
Goodwill, impairment loss | 180 |  | 180 |  |
Impairment of intangible assets | $ 277 |  | $ 277 |  |
KAYAK | Minimum | Measurement Input, Royalty Rates, Distribution Margins, and Supplier Attrition Rates |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Fair value measurement, inputs (percentages) | 2.00% |  | 2.00% |  |
Finite-lived intangible assets |  |  |  |  |
Fair value measurement, inputs (percentages) | 2.00% |  | 2.00% |  |
KAYAK | Maximum | Measurement Input, Royalty Rates, Distribution Margins, and Supplier Attrition Rates |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Fair value measurement, inputs (percentages) | 5.00% |  | 5.00% |  |
Finite-lived intangible assets |  |  |  |  |
Fair value measurement, inputs (percentages) | 5.00% |  | 5.00% |  |
Trade Names | KAYAK |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Intangible assets, net | $ 103 |  | $ 103 |  |
Finite-lived intangible assets |  |  |  |  |
Intangible assets, net | $ 103 |  | $ 103 |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  | 20 years |  |
Supply and Distribution Agreements | KAYAK |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Intangible assets, net | $ 76 |  | $ 76 |  |
Finite-lived intangible assets |  |  |  |  |
Intangible assets, net | $ 76 |  | $ 76 |  |

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