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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Apr. 30, 2020
Accounting Policies [Line Items]        
Accrued performance marketing liabilities $ 480 $ 306    
Accrued compensation liabilities 518 421    
Matching contributions 40 32 $ 33  
Retained earnings 27,541 24,453    
Long-term debt 11,985 8,937    
Additional paid-in capital (6,491) (6,159)    
Deferred income taxes $ (685) (905)    
Online Travel Reservation Services        
Accounting Policies [Line Items]        
Time period from the reservation date that performance obligations are expected to be completed one year      
Accounting Standards Update 2020-06        
Accounting Policies [Line Items]        
Retained earnings   30    
Long-term debt   86    
Additional paid-in capital   96    
Deferred income taxes   21    
COVID-19        
Accounting Policies [Line Items]        
Government grant and other assistance benefit that was returned, cash paid   $ 107    
Convertible Senior Notes | 0.75% Convertible Senior Notes due May 2025        
Accounting Policies [Line Items]        
Stated interest rate 0.75% 0.75%   0.75%