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Income (loss) per Share (Tables)
12 Months Ended
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 millions202120202019
Basic weighted average common shares outstanding140 142 141 
Stock options, restricted shares and convertible debt (a)— 
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.