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v3.25.2

Unapproved Change Orders and Claims Against Clients (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jul. 04, 2025 | Jun. 28, 2024
Contractors [Abstract] |  |
Approved change orders | $ 128 | $ 0

X
- Definition Approved Change Orders + References No definition available. + Details
Name: | kbr_ApprovedChangeOrders
Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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