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Acquisitions (Pro Forma Information) (Details) - Frazer-Nash and Centauri - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Revenue	$ 7,465	$ 6,317	$ 6,137
Net income attributable to KBR	$ 28	$ (64)	$ 172
Diluted earnings per share (usd per share)	$ 0.19	$ (0.45)	$ 1.20

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
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