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SHARE-BASED AWARDS - Expense and Capitalized (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 59 $ 164 $ 126 $ 403
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense 43 156 94 353
Sales, marketing and operations        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense 5 1 9 8
Technology and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 11 $ 7 $ 23 $ 42