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v3.21.2

Business Segment Information (Narrative) (Details) - segment | Jun. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020
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Segment Reporting [Abstract] |  |  |
Core business segments, number | 2 | 2 | 3
Non-core business segments, number | 1 |  |

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

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration