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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