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v3.25.3

Business Segment Information (Narrative) (Details) | 9 Months Ended
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Oct. 03, 2025 process_technology segment vertical
Segment Reporting Information [Line Items] |
Core business segments, number | 2
Non-core business segments, number | 1
STS |
Segment Reporting Information [Line Items] |
Number of process technologies (over) | process_technology | 85
Number of primary areas | vertical | 4

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- Definition Business Segment, Number of Core Business Segments + References No definition available. + Details
Name: | kbr_BusinessSegmentNumberOfCoreBusinessSegments
Namespace Prefix: | kbr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Business Segment, Number of Non-core Business Segments + References No definition available. + Details
Name: | kbr_BusinessSegmentNumberOfNonCoreBusinessSegments
Namespace Prefix: | kbr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Primary Areas + References No definition available. + Details
Name: | kbr_NumberOfPrimaryAreas
Namespace Prefix: | kbr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Process Technologies + References No definition available. + Details
Name: | kbr_NumberOfProcessTechnologies
Namespace Prefix: | kbr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kbr_SustainableTechnologySolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |