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Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1,796 $ 1,935 $ 1,793
Operations and support      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 218 184 154
Sales and marketing      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 91 96 102
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 1,104 1,215 1,060
General and administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 383 $ 440 $ 477