REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 5,462	$ 4,294	$ 9,240	$ 6,989
Online accommodation reservation services | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	89.00%	88.00%	89.00%	87.00%
Other sources of online travel reservation services and advertising and other revenues | Revenue Benchmark | Product Concentration Risk | Maximum
Disaggregation of Revenue [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 615	$ 594	$ 1,138	$ 1,069
The Netherlands
Disaggregation of Revenue [Line Items]
Revenues	4,340	3,340	7,199	5,309
Other
Disaggregation of Revenue [Line Items]
Revenues	$ 507	$ 360	$ 903	$ 611