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Unapproved Change Orders and Claims Against Clients (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Oct. 03, 2025	Sep. 27, 2024
Contractors [Abstract]
Approved change orders	$ 128	$ 0

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- Definition

Approved Change Orders

+ References

No definition available.

+ Details

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