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Name:	us-gaap_BusinessAcquisitionAxis=kbr_LinQuestMember
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Data Type:	na
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Acquisitions (Narrative) (Details) - USD ($) $ in Millions			6 Months Ended
Acquisitions (Narrative) (Details) - USD ($) $ in Millions	May 17, 2025	Aug. 30, 2024	Jul. 04, 2025	Jun. 28, 2024	Jan. 03, 2025
Business Combination [Line Items]
Goodwill			$ 2,693		$ 2,630
Cash consideration paid			$ 11	$ 0
Infrastar Corporation
Business Combination [Line Items]
Purchase price of acquisition	$ 35
Cash consideration paid	15
Contingent consideration	20
Maximum contingent consideration	24
Cash	4
Goodwill	22
Infrastar Corporation \| Customer relationships
Business Combination [Line Items]
Intangible assets	$ 11
LinQuest Corporation
Business Combination [Line Items]
Goodwill		$ 526
Cash consideration paid		739
Intangible assets		$ 200
Weighted average amortization period		14 years