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Share Repurchases (Narrative) (Details) - USD ($)	Oct. 03, 2025	Feb. 20, 2025
Equity [Abstract]
Additional amount authorized for repurchase program		$ 454,000,000
Stock repurchase program, authorized amount		$ 750,000,000
Remaining authorized repurchase amount	$ 452,000,000

X

- Definition

Stock Repurchase Program, Increase In Authorized Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	kbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- Definition

Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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