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Unapproved Change Orders and Claims Against Clients (Schedule of Unapproved Change Orders and Claims) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 02, 2026 | Jan. 03, 2025
Unapproved Change Orders [Roll Forward] |  |
Amounts included in project estimates-at-completion at beginning of fiscal year | $ 104 | $ 74
Net increase in project estimates | 67 | 57
Resolution of claim | 0 | (27)
Approved change orders | (146) | 0
Amounts included in project-related estimates-at-completion at end of fiscal year | 25 | 104
Amounts recognized over time based on progress | $ 13 | $ 100

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- Definition Approved Change Orders + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Construction Contractor, Contract Cost, Amounts Recognized, Amount + References No definition available. + Details
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Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Unapproved Change Orders, Increase (Decrease) In Estimates + References No definition available. + Details
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Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
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- Definition Unapproved Change Orders, Resolution of Claim + References No definition available. + Details
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Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition unapproved Change Orders [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | kbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of cost incurred on construction contract for unapproved change order, claim, or similar item subject to uncertainty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 910 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482332/910-20-50-1 + Details
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