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REVENUES
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
REVENUES REVENUES
Revenues by Type of Service

Approximately 90% and 89% of the Company's revenues for the three and nine months ended September 30, 2025, respectively, and 90% for the three and nine months ended September 30, 2024, respectively, relate to online accommodation reservation services. Revenues from all other sources of online travel reservation services and advertising and other revenues each individually represent less than 10% of the Company's total revenues for each period.

Consumer Incentive Programs

At September 30, 2025 and December 31, 2024, liabilities of $81 million and $150 million, respectively, were included in "Accrued expenses and other current liabilities" in the Consolidated Balance Sheets for incentives granted to consumers.

Deferred Merchant Bookings

Cash payments received from travelers in advance of the Company completing its performance obligations are included in "Deferred merchant bookings" in the Company's Consolidated Balance Sheets and are comprised principally of amounts estimated to be payable to travel service providers as well as the Company's estimated future revenue for its commission or margin and fees. The amounts are mostly subject to refunds for cancellations.