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COMMITMENTS AND CONTINGENCIES - Building Construction (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2016
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
EUR (€)
Sep. 30, 2016
EUR (€)
Other Commitments [Line Items]            
Remaining lease obligations     $ 585      
Booking.com | Headquarters            
Other Commitments [Line Items]            
Acquisition of land use rights $ 48 € 43        
Contractual obligation $ 331   68   € 56 € 270
Decrease in contractual obligation     11 € 9    
Booking.com | Headquarters | Vendors used to fit out and furnish office space            
Other Commitments [Line Items]            
Contractual obligation     35   29  
Booking.com | Headquarters | Ground Lease            
Other Commitments [Line Items]            
Remaining lease obligations     $ 86   € 70