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Preferred and Common Stock - Schedule of Share Activity (Details) - shares |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2016 | Aug. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Treasury stock retirement (in shares) | (25,000,000) | (76,000,000) |  |  |
Common stock outstanding, ending balance (in shares) |  |  | 483,270,717 |  |
Treasury stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Treasury stock, beginning balance (in shares) |  |  | 0 | 0 | 81,051,103
Issued for stock-based compensation plans (in shares) |  |  | 0 | 0 | (5,219,660)
Treasury stock retirement (in shares) |  |  |  |  | (75,831,443)
Reverse stock split (in shares) |  |  |  |  | 0
Conversion of convertible notes (in shares) |  |  |  | 0 |
Treasury stock, ending balance (in shares) |  |  | 0 | 0 | 0
Common stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Common stock outstanding, beginning balance (in shares) |  |  | 481,416,537 | 438,519,780 | 1,310,160,141
Issued for stock-based compensation plans (in shares) |  |  | (1,854,180) | (3,654,051) | (5,302,128)
Treasury stock retirement (in shares) |  |  |  |  | 0
Reverse stock split (in shares) |  |  |  |  | (876,942,489)
Conversion of convertible notes (in shares) |  |  |  | 39,242,706 |
Common stock outstanding, ending balance (in shares) |  |  | 483,270,717 | 481,416,537 | 438,519,780

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