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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of Restricted Stock, Restricted Stock Unit and Stock Option Activity | The following table summarizes RSU and stock option activity:
| RSUs | Stock Options
| Number | Weighted Average Grant Date Fair Value Per Share | Number | Weighted Average Exercise Price Per Share
Outstanding as of December 31, 2020 | 2,258,594 |  | $21.76 | 5,752,932 |  | $44.40
Granted | 596,391 |  | 18.67 | 481,626 |  | 17.96
Forfeited or expired | (132,713) |  | 18.78 | (659,216) |  | 58.37
Vested/exercised | (810,560) |  | 30.83 | (84,416) |  | 8.81
Outstanding as of December 31, 2021 | 1,911,712 |  | $17.16 | 5,490,926 |  | $40.95
Granted | 415,356 |  | 22.36 | 250,656 |  | 21.90
Forfeited or expired | (2,937) |  | 25.55 | (846,621) |  | 61.46
Vested/exercised | (957,640) |  | 22.01 | (217,397) |  | 15.20
Outstanding as of December 31, 2022 | 1,366,491 |  | $15.33 | 4,677,564 |  | $37.41
Granted | 432,654 |  | 34.88 | 178,434 |  | 35.76
Forfeited or expired | (4,897) |  | 35.76 | (525,994) |  | 61.06
Vested/exercised | (869,753) |  | 13.21 | (198,455) |  | 12.64
Outstanding as of December 31, 2023 | 924,495 |  | $26.36 | 4,131,549 |  | $35.52
Options exercisable as of December 31, 2023 |  |  | 3,514,925 |  | $37.56
Remaining unvested options outstanding and expected to vest |  |  | 610,458 |  | $23.93
During the first quarter of 2023, the following units were granted based upon the establishment of performance targets:
| Performance-based Award Units Granted in 2023 | Weighted Average Grant Date Fair Value Per Share
2023 Performance Award Plan | 128,213 | $42.71
2022 Performance Award Plan | 142,319 | $35.87
2021 Performance Award Plan | 204,622 | $46.84
Schedule of Fair Value on Grant Date and Significant Assumptions used in Black-Scholes Option-Pricing Model | The grant date fair value of options and other significant assumptions follow:
| 2023 | 2022 | 2021
Weighted average grant date fair value | $16.52 | $11.19 | $8.94
Expected life of options (in years) | 4.6 | 4.5 | 4.5
Risk-free interest rate | 4.0 | % | 1.9 | % | 0.7 | %
Expected volatility | 50 | % | 62 | % | 62 | %
Expected annual dividend per share | $0.00 | $0.00 | $0.00
Summary of Information Related to Options Outstanding | Information related to options outstanding as of December 31, 2023 follows:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding | Weighted Average Remaining Contractual Life (In Years) | Weighted Average Exercise Price Per Share |  | Number Exercisable | Weighted Average Remaining Contractual Life (In Years) | Weighted Average Exercise Price Per Share
$8.81 - $35.76 | 2,411,890 |  | 6.8 | $ | 20.05 |  |  | 1,795,266 |  | 6.4 | $ | 18.71 |
$46.07 - $62.50 | 1,531,586 |  | 2.6 | 54.53 |  |  | 1,531,586 |  | 2.6 | 54.53 |
$70.76 - $79.19 | 188,073 |  | 0.1 | 79.19 |  |  | 188,073 |  | 0.1 | 79.19 |
| 4,131,549 |  | 4.9 | $ | 35.52 |  |  | 3,514,925 |  | 4.4 | $ | 37.56 |
Disclosure of Compensation Arrangements by Share-based Payment Award |
|  | Location in Statement of Operations |  | December 31,
Compensation Expense (in millions) |  |  | 2023 |  | 2022 |  | 2021
SGI awards |  | G&A |  | $ | 34 |  |  | $ | 54 |  |  | $ | 67 |
Performance-based awards for non-Section 16 executives |  | G&A |  | 21 |  |  | 14 |  |  | 1 |
Liabilities (in millions) |  | Location on Balance Sheet | December 31, 2023 |  | December 31, 2022
SGI awards |  | Accrued salaries, wages and benefits and Other noncurrent liabilities | $ | 58 |  |  | $ | 92 |
Performance-based awards for other executives |  | Accrued salaries, wages and benefits and Other noncurrent liabilities | 29 |  |  | 15 |

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