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Business Segment Information Subsequent Events (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Subsequent Events [Abstract]
Expected proceeds from new strategic partnerships	$ 32

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- Definition

Expected proceeds from new strategic partnerships

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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