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Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Class of Stock [Line Items] |  |  |  |
Common stock repurchased under repurchase programs (in shares) | 19,997,008 | 22,806,841 | 29,530,400 | 71,509,671
Average purchase price per share (in usd per share) | $ 18.01 | $ 19.27 | $ 18.15 | $ 16.87
Shares repurchased related to employee stock-based compensation plans (in shares) | 196,301 | 192,432 | 1,130,903 | 1,252,412
Average purchase price per share (in usd per share) | $ 17.45 | $ 18.80 | $ 18.36 | $ 14.32
Common shares issued (in shares) | 493,893 | 454,920 | 3,088,710 | 3,281,307
Remaining authority under the share repurchase program | $ 753 |  | $ 753 |
Common stock repurchased and cancelled (in shares) |  |  |  | 28,500,000
2021 Share Repurchase Program, Accelerated Purchases |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock repurchased under repurchase programs (in shares) |  |  |  | 13,000,000

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