REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 6,052	$ 4,676	$ 13,041	$ 7,977
Online accommodation reservation services | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	90.00%	89.00%	88.00%	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	$ 606	$ 444	$ 1,675	$ 1,034
The Netherlands
Disaggregation of Revenue [Line Items]
Revenues	4,991	3,955	10,300	6,367
Other
Disaggregation of Revenue [Line Items]
Revenues	$ 455	$ 277	$ 1,066	$ 576