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Income (loss) per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Weighted Average Common Shares Outstanding | A reconciliation of the number of shares used for the basic and diluted income per share calculations is as follows:
| Years ended December 31,
Shares in millions | 2021 |  | 2020 |  | 2019
Basic weighted average common shares outstanding | 140 |  |  | 142 |  |  | 141 |
Stock options, restricted shares and convertible debt (a) | 5 |  |  | — |  |  | 1 |
Diluted weighted average common shares outstanding (b) | 145 |  |  | 142 |  |  | 142 |
(a)For the year ended December 31, 2021 and 2019, there was a diluted impact primarily related to our Convertible Debt. (b)In periods for which we report a net loss attributable to KBR, basic net loss per share and diluted net loss per share are identical as the effect of all potential common shares is anti-dilutive and therefore excluded.

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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