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Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Equity [Abstract] |  |  |  |
Common stock repurchased under repurchase program (in shares) | 4,436,963 | 0 | 15,861,718 | 0
Average purchase price per share (in usd per share) | $ 8.45 | $ 0 | $ 9.94 | $ 0
Shares repurchased related to employee stock-based compensation plans (in shares) | 15,238 | 116,151 | 1,328,665 | 3,056,746
Average purchase price per share (in usd per share) | $ 9.54 | $ 11.54 | $ 10.92 | $ 11.34
Common shares issued (in shares) | 26,137 | 397,004 | 3,677,821 | 6,341,950
Remaining authority under the share repurchase program | $ 43 |  | $ 43 |

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