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COMMITMENTS AND CONTINGENCIES (Details)
€ in Millions
3 Months Ended 6 Months Ended 30 Months Ended
Jul. 09, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Mar. 31, 2018
EUR (€)
Sep. 30, 2016
EUR (€)
Jun. 30, 2018
USD ($)
country
Jun. 30, 2018
EUR (€)
country
Jun. 30, 2017
USD ($)
Mar. 31, 2021
EUR (€)
Jun. 30, 2018
EUR (€)
Commitments and Contingencies                  
Number of pricing parity working group members | country         10 10      
Payments for building construction | $         $ 235,035,000   $ 147,269,000    
Booking.com | Headquarters                  
Commitments and Contingencies                  
Contractual obligation for building construction       € 270          
Units of account       2          
Payments to developer       € 48          
Acquisition of land use rights       43          
Payments for building construction     € 34 € 5          
Booking.com | Headquarters | Ground Lease                  
Commitments and Contingencies                  
Contractual obligation for building construction                 € 78
Term of operating lease       49 years 48 years       48 years
Series of individually immaterial business acquisitions                  
Commitments and Contingencies                  
Contingent consideration arrangements, range of outcomes, minimum value | $         $ 0        
Contingent consideration arrangements, range of outcomes, maximum value | $         90,000,000        
Series of individually immaterial business acquisitions | Fair Value, Inputs, Level 3                  
Commitments and Contingencies                  
Contingent consideration liability | $         $ 9,000,000        
French Tax Audit                  
Commitments and Contingencies                  
Assessed taxes including interest and penalties           € 356      
Scenario, Forecast [Member] | Subsequent Event                  
Commitments and Contingencies                  
Purchase price consideration | $ $ 140,000,000                
Scenario, Forecast [Member] | Booking.com | Headquarters                  
Commitments and Contingencies                  
Payments for building construction               € 161  
Scenario, Forecast [Member] | Booking.com | Headquarters | Subsequent Event                  
Commitments and Contingencies                  
Payments for building construction   € 27