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Unapproved Change Orders and Claims Against Clients (Schedule of Unapproved Change Orders and Claims) (Details) - USD ($) $ in Millions | 9 Months Ended
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Oct. 03, 2025 | Sep. 27, 2024
Unapproved Change Orders [Roll Forward] |  |
Amounts included in project estimates-at-completion at beginning of fiscal year | $ 104 | $ 74
Net increase in project estimates | 64 | 53
Approved change orders | (128) | 0
Ending balance of amounts included in project estimates-at-completion | 40 | 127
Amounts recognized over time based on progress | $ 33 | $ 112

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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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- Definition Construction Contractor, Contract Cost, Amounts Recognized, Amount + References No definition available. + Details
Name: | kbr_ConstructionContractorContractCostAmountsRecognizedAmount
Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Unapproved Change Orders, Increase (Decrease) In Estimates + References No definition available. + Details
Name: | kbr_UnapprovedChangeOrdersIncreaseDecreaseInEstimates
Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition unapproved Change Orders [Roll Forward] + References No definition available. + Details
Name: | kbr_UnapprovedChangeOrdersRollForward
Namespace Prefix: | kbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_UnapprovedChangeOrdersAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant