Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation expense | $ 359 | $ 281 |
| Operations and support | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation expense | 33 | 28 |
| Sales and marketing | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation expense | 22 | 22 |
| Research and development | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation expense | 196 | 133 |
| General and administrative | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation expense | $ 108 | $ 98 |