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Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 10, 2020 | Jan. 23, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Equity [Abstract] |  |  |  |
Common stock repurchased under repurchase program (in shares) | 44,900,000 | 3,000,000 | 47,736,847 | 5,435,476
Average purchase price per share (in usd per share) |  |  | $ 9.66 | $ 11.04
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  | 1,105,119 | 1,289,391
Average purchase price per share (in usd per share) |  |  | $ 10.98 | $ 10.95
Common shares issued (in shares) |  |  | 2,837,562 | 3,470,664
Remaining authority under the share repurchase program |  |  | $ 75 |

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