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Unapproved Change Orders and Claims Against Clients (Tables) | 12 Months Ended
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Jan. 02, 2026
Contractors [Abstract] |
Schedule of Unapproved Change Orders and Claims | The amounts of unapproved change orders and claims against clients included in determining the profit or loss on contracts that has been recorded to date are as follows:
Dollars in millions | Fiscal 2025 |  | Fiscal 2024
Amounts included in project estimates-at-completion at beginning of fiscal year | $ | 104 |  |  | $ | 74 |
Net increase in project estimates | 67 |  |  | 57 |
Resolution of claim | — |  |  | (27) |
Approved change orders | (146) |  |  | — |
Amounts included in project-related estimates-at-completion at end of fiscal year | $ | 25 |  |  | $ | 104 |
Amounts recognized over time based on progress | $ | 13 |  |  | $ | 100 |

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- Definition This element may be used to capture the disclosure pertaining to an entity's unapproved claims and change orders used in determining the profit or loss on contracts. + References No definition available. + Details
Name: | kbr_ScheduleofUnapprovedClaimsandChangeOrdersTableTextBlock
Namespace Prefix: | kbr_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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