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Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 10, 2021 | Jan. 28, 2021 | Mar. 11, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity [Abstract] |  |  |  |  |  |  |
Common stock repurchased under repurchase program (in shares) | 45,000,000 | 13,000,000 | 45,000,000 | 13,018,585 | 0 | 84,528,256 | 47,736,847
Average purchase price per share (in usd per share) |  |  |  | $ 18.75 | $ 0 | $ 17.17 | $ 9.66
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  | 115,414 | 3,122 | 1,367,826 | 1,109,149
Average purchase price per share (in usd per share) |  |  |  | $ 18.83 | $ 7.05 | $ 14.70 | $ 10.97
Common shares issued (in shares) |  |  |  | 504,183 | 5,150 | 3,785,490 | 2,990,447
Remaining authority under the share repurchase program |  |  |  | $ 51 |  | $ 51 |
Common stock repurchased and cancelled (in shares) |  |  |  |  |  | 28,500,000 |

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