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Business Segment Information Prior Period Adjustment (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total	Total
Prior Period Adjustment [Abstract]
Impact Of Correction of Prior Period Error on Net Income	$ 15	$ 15

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- Definition

Impact Of Correction of Prior Period Error on Equity in Earnings of Unconsolidated Affiliates

+ References

No definition available.

+ Details

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Namespace Prefix:	kbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_PriorPeriodAdjustmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration