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ACQUISITIONS (Details)
$ in Millions, € in Billions
1 Months Ended
Dec. 31, 2021
USD ($)
Nov. 30, 2021
EUR (€)
Nov. 30, 2021
USD ($)
Etraveli Group      
Business Acquisition [Line Items]      
Business combination, pending acquisition not yet completed, acquisition price   € 1.6 $ 1,800
Getaroom      
Business Acquisition [Line Items]      
Business combination, consideration transferred $ 1,300    
Payments to acquire businesses, net of cash acquired 1,200    
Cash acquired from acquisition 116    
Other noncurrent liabilities [1] 41    
Getaroom | Travel Transaction Related Taxes      
Business Acquisition [Line Items]      
Other noncurrent liabilities 38    
Getaroom | Distribution Agreement      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles $ 299    
Acquired finite-lived intangible assets, weighted average useful life 10 years    
Getaroom | Technology      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles $ 124    
Acquired finite-lived intangible assets, weighted average useful life 4 years    
[1] Includes liabilities of $38 million principally related to travel transaction taxes.