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Stockholders' Deficit - Changes in Common Stock (Details) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Shares outstanding as of beginning of period (in shares) | 94 | 92
Shares issued as part of equity-based compensation plans and the ESPP, net of shares surrendered (in shares) | 1 | 2
Shares outstanding as of end of period (in shares) | 95 | 94

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