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Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 281 $ 183 $ 834 $ 591
Operations and support        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 42 16 107 52
Sales and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 18 11 60 35
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 152 102 434 341
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 69 $ 54 $ 233 $ 163