Stock-Based Compensation - Option Activity (Details) - Common Stock - Class B - shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] | ||
| Outstanding (in shares) | 75,044,000 | 77,981,000 |
| Granted stock (in shares) | 17,690,000 | 62,676,000 |
| Vested (in shares) | (92,734,000) | (65,613,000) |
| Outstanding (in shares) | 0 | 75,044,000 |