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Equity - Changes in Number of Shares Outstanding (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Issue of shares upon vesting of restricted stock units (in shares) | 850 | 1,553 | 867
Issue of shares on exercises of stock options (in shares) | 438 |  |
Common Stock | Class A Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of year (in shares) | 723,999 | 650,065 |
Issue of shares for employee stock purchase plan (in shares) | 2,510 | 4,378 |
Exchange of Class B common stock for Class A common stock (in shares) | 194,885 | 65,995 |
Repurchase and cancellation of Class A common stock (in shares) | (17,628) | 0 |
Balance at end of year (in shares) | 909,142 | 723,999 | 650,065
Common Stock | Class A Common Stock | RSUs |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Issue of shares upon vesting of restricted stock units (in shares) | 4,968 | 3,548 |
Common Stock | Class A Common Stock | Options |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Issue of shares on exercises of stock options (in shares) | 408 | 13 |
Common Stock | Class B Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of year (in shares) | 311,433 | 377,428 |
Issue of shares for employee stock purchase plan (in shares) | 0 | 0 |
Exchange of Class B common stock for Class A common stock (in shares) | (194,885) | (65,995) |
Repurchase and cancellation of Class A common stock (in shares) | 0 | 0 |
Balance at end of year (in shares) | 116,548 | 311,433 | 377,428
Common Stock | Class B Common Stock | RSUs |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Issue of shares upon vesting of restricted stock units (in shares) | 0 | 0 |
Common Stock | Class B Common Stock | Options |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Issue of shares on exercises of stock options (in shares) | 0 | 0 |

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