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REVENUES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Online accommodation reservation services | Revenue Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk percentage 89.00% 89.00% 89.00% 89.00%  
Concentration risk percentage 89.00% 89.00% 89.00% 89.00%  
Incentives Programs | Accrued expenses and other current liabilities          
Disaggregation of Revenue [Line Items]          
Liabilities for incentives granted to consumers $ 112   $ 112   $ 149