Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Share-based compensation expense | $ 1,168 | $ 827 | $ 4,596 |
| Operations and support | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Share-based compensation expense | 139 | 72 | 454 |
| Sales and marketing | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Share-based compensation expense | 83 | 48 | 243 |
| Research and development | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Share-based compensation expense | 614 | 477 | 2,958 |
| General and administrative | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Share-based compensation expense | $ 332 | $ 230 | $ 941 |