ACQUISITIONS Narrative (Details) € in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Dec. 31, 2021 USD ($)	Nov. 30, 2021 USD ($)	Nov. 30, 2021 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired				$ 0	$ 1,185	$ 0
Etraveli Group
Business Acquisition [Line Items]
Business combination, pending not yet completed, acquisition amount		$ 1,700	€ 1,600
Getaroom
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 1,300
Payments to acquire businesses, net of cash acquired	$ 1,200
Goodwill measurement period adjustment				38
Deferred Tax Liabilities, Purchase Accounting Adjustments				27
Finite-Lived Intangible Assets, Purchase Accounting Adjustments				14
Other Noncurrent Liabilities, Purchase Accounting Adjustments				$ 3