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Share-based Compensation and Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following table presents stock options granted, exercised, forfeited and expired under KBR share-based compensation plans for the year ended December 31, 2021.
KBR stock options activity summary | Number of Shares |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2020 | 1,218,508 |  |  | $ | 28.02 |  |  | 2.34 |  | $ | 0.58 |
Granted | — |  |  | — |  |  |  |  |
Exercised | (414,108) |  |  | 29.77 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Expired | (187,053) |  |  | 36.70 |  |  |  |  |
Outstanding at December 31, 2021 | 617,347 |  |  | $ | 24.27 |  |  | 2.18 |  | $ | 1.45 |
Exercisable at December 31, 2021 | 617,347 |  |  | $ | 24.19 |  |  | 2.18 |  | $ | 1.45 |
Summary of Vested and Unvested RSUs | The following table presents the restricted stock awards and restricted stock units granted, vested and forfeited during 2021 under the KBR Stock Plan.
Restricted stock activity summary | Number of Shares |  | Weighted Average Grant-Date Fair Value per Share
Nonvested shares at December 31, 2020 | 1,187,479 |  |  | $ | 21.54 |
Granted | 491,871 |  |  | 33.97 |
Vested | (477,153) |  |  | 21.37 |
Forfeited | (75,897) |  |  | 26.99 |
Nonvested shares at December 31, 2021 | 1,126,300 |  |  | $ | 26.85 |
Summary of Stock-Based Compensation |
Share-based compensation summary table | Years ended December 31,
Dollars in millions | 2021 |  | 2020 |  | 2019
Share-based compensation | $ | 12 |  |  | $ | 12 |  |  | $ | 12 |
Income tax benefit recognized in net income for share-based compensation | $ | 2 |  |  | $ | 3 |  |  | $ | 3 |
Incremental compensation cost | $ | — |  |  | $ | 1 |  |  | $ | — |

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