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Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 10, 2020 | Jan. 23, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Equity [Abstract] |  |  |  |  |  |
Common stock repurchased under repurchase program (in shares) | 44,900,000 | 3,000,000 | 0 | 4,436,963 | 47,736,847 | 15,861,718
Average purchase price per share (in usd per share) |  |  | $ 0 | $ 8.45 | $ 9.66 | $ 9.94
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  | 3,122 | 15,238 | 1,109,149 | 1,328,665
Average purchase price per share (in usd per share) |  |  | $ 7.05 | $ 9.54 | $ 10.97 | $ 10.92
Common shares issued (in shares) |  |  | 5,150 | 26,137 | 2,990,447 | 3,677,821
Remaining authority under the share repurchase program |  |  | $ 75 |  | $ 75 |

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