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Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Jan. 28, 2021 | Mar. 11, 2020 | Mar. 10, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Equity [Abstract] |  |  |  |  |
Common stock repurchased under repurchase program (in shares) | 13,000,000 | 45,000,000 | 45,000,000 | 48,702,830 | 47,736,847
Average purchase price per share (in usd per share) |  |  |  | $ 15.75 | $ 9.66
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  | 1,059,980 | 1,105,119
Average purchase price per share (in usd per share) |  |  |  | $ 13.50 | $ 10.98
Common shares issued (in shares) |  |  |  | 2,826,387 | 2,837,562
Remaining authority under the share repurchase program |  |  |  | $ 734 |
Common stock repurchased and cancelled (in shares) |  |  |  | 28,500,000 |

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