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v3.21.2

Basis of Presentation (Narrative) (Details) | Jun. 30, 2021 business_unit segment | Jan. 01, 2021 segment | Dec. 31, 2020 segment
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Segment Reporting Information [Line Items] |  |  |
Core business segments, number | segment | 2 | 2 | 3
Government Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of business units | business_unit | 4 |  |

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

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- Definition Number Of Business Units + References No definition available. + Details
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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |