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Business Segment Information (Narrative) (Details)	9 Months Ended
	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

X

- Definition

Business Segment, Number of Core Business Segments

+ References

No definition available.

+ Details

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Namespace Prefix:	kbr_
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X

- Definition

Business Segment, Number of Non-core Business Segments

+ References

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+ Details

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Namespace Prefix:	kbr_
Data Type:	xbrli:integerItemType
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X

- Definition

Number of Primary Areas

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Number of Process Technologies

+ References

No definition available.

+ Details

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X

- 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

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X

- Details

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Period Type: