Basis of Presentation (Policies)	3 Months Ended
Apr. 03, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and include the accounts of KBR, Inc. and the subsidiaries it controls, including VIEs where it is the primary beneficiary (collectively, the "Company," "KBR", "we", "us" or "our"). We account for investments over which we have significant influence, but not a controlling financial interest, using the equity method of accounting. See Note 6. "Equity Method Investments and Variable Interest Entities" to our condensed consolidated financial statements for further discussion of our equity investments and VIEs. All material intercompany balances and transactions are eliminated in consolidation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements New accounting pronouncements requiring implementation in future periods are discussed below. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. ASU 2024-03 requires disclosure of additional information about certain income statement expense categories. ASU 2024-03 will be effective for our fiscal year ending December 31, 2027. Early adoption is permitted and the amendments can be applied on a prospective or retrospective basis. We expect this ASU to only impact our disclosures with no impacts to our results of operations, cash flows and financial condition. In September 2025, the FASB issued ASU 2025-06, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. This guidance removes all references to project stages throughout ASC 350-40 and clarifies the threshold entities apply to begin capitalizing costs. Under the new standard, cost capitalization should only commence when an entity has committed to funding a software project and it is probable the project will be completed and the software will be used for its intended function. The amendments are effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. Entities may apply the guidance using a prospective, retrospective or modified transition approach. Early adoption is permitted as of the beginning of an annual reporting period. We are currently determining the preferred transition approach and assessing the impact of the ASU on our disclosures and financial statements, including the timing of its adoption.

Basis of Presentation (Policies)

3 Months Ended

Apr. 03, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and include the accounts of KBR, Inc. and the subsidiaries it controls, including VIEs where it is the primary beneficiary (collectively, the "Company," "KBR", "we", "us" or "our"). We account for investments over which we have significant influence, but not a controlling financial interest, using the equity method of accounting. See Note 6. "Equity Method Investments and Variable Interest Entities" to our condensed consolidated financial statements for further discussion of our equity investments and VIEs. All material intercompany balances and transactions are eliminated in consolidation.

Recent Accounting Pronouncements

New accounting pronouncements requiring implementation in future periods are discussed below.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. ASU 2024-03 requires disclosure of additional information about certain income statement expense categories. ASU 2024-03 will be effective for our fiscal year ending December 31, 2027. Early adoption is permitted and the amendments can be applied on a prospective or retrospective basis. We expect this ASU to only impact our disclosures with no impacts to our results of operations, cash flows and financial condition.

In September 2025, the FASB issued ASU 2025-06, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. This guidance removes all references to project stages throughout ASC 350-40 and clarifies the threshold entities apply to begin capitalizing costs. Under the new standard, cost capitalization should only commence when an entity has committed to funding a software project and it is probable the project will be completed and the software will be used for its intended function. The amendments are effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. Entities may apply the guidance using a prospective, retrospective or modified transition approach. Early adoption is permitted as of the beginning of an annual reporting period. We are currently determining the preferred transition approach and assessing the impact of the ASU on our disclosures and financial statements, including the timing of its adoption.