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

X

- Definition

Business Segment, Number of Core Business Segment

+ References

No definition available.

+ Details

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X

- 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

X

- References

No definition available.

+ Details

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