U.S. Government Matters	6 Months Ended
U.S. Government Matters	Jul. 04, 2025
United States Government Contract Work [Abstract]
U.S. Government Matters	U.S. Government Matters We provide services to various U.S. governmental agencies, including the U.S. DoD, NASA, Department of State and other agencies within the Intelligence Community. The negotiation, administration and settlement of our contracts are subject to audit by the DCAA. The DCAA serves in an advisory role to the DCMA, which is responsible for the administration of the majority of our contracts. The scope of these audits includes, among other things, the validity of direct and indirect incurred costs, provisional approval of annual billing rates, approval of annual overhead rates, compliance with the FAR and CAS, compliance with certain unique contract clauses and audits of certain aspects of our internal control systems. Based on the information received to date, we do not believe any completed or ongoing government audits will have a material adverse impact on our results of operations, financial position or cash flows. The U.S. government also retains the right to pursue various remedies under any of these contracts which could result in challenges to expenditures, suspension of payments, fines and suspensions or debarment from future business with the U.S. government. We accrued for probable and reasonably estimable unallowable costs associated with open government matters related to our MTS business in the amounts of $42 million as of July 4, 2025 and $41 million as of January 3, 2025, which are recorded in other liabilities on our condensed consolidated balance sheets. Legacy U.S. Government Matters Between 2002 and 2011, we provided significant support to the U.S. Army and other U.S. government agencies in support of the war in Iraq under the LogCAP III contract. We have been closing out the LogCAP III contract since 2011, and we expect the contract closeout process to continue for at least another year. As a result of our work under LogCAP III, there are claims and disputes pending between us and the U.S. government that need to be resolved in order to close the contract. The contract closeout process includes administratively closing the individual task orders issued under the contract. We continue to work with the U.S. government to resolve the issues to close the remaining task orders, which includes ongoing litigation of third-party vendor disputes. We also have matters related to ongoing litigation or investigations involving U.S. government contracts. We anticipate billing vendor resolution and vendor litigation costs as we resolve the open matters in the future. First Kuwaiti Trading Company arbitration. In April 2008, FKTC, one of our LogCAP III subcontractors providing housing containers, filed for arbitration with the American Arbitration Association for several claims under various LogCAP III subcontracts. After a series of arbitration proceedings and related litigation between KBR and the U.S. government, the panel heard the final claims and we received an award on July 27, 2022. FKTC filed a motion for correction of the award asking the tribunal to change its findings. The tribunal denied FKTC's motion in an order issued on October 20, 2022. On January 5, 2023, FKTC filed a motion to vacate the arbitral award in the Eastern District of Virginia Federal District Court. KBR filed its response on February 2, 2023. On March 22, 2023, both parties presented oral arguments. On May 12, 2023, the District Court issued its order denying FKTC’s motion to vacate the arbitration award and confirming the award. On June 12, 2023, the parties submitted their briefs in support of their calculations of the final award amount. KBR sought to confirm the net award of $16 million in KBR’s favor plus post-judgment interest. FKTC sought to offset amounts awarded to KBR with amounts FKTC claimed it was owed based on unpaid principal and post award interest on the awards issued in its favor in the prior arbitration proceedings, totaling $70 million. KBR disagreed with FKTC’s interest claim and calculation. On September 22, 2023, the Court issued a decision finding the net amount due in favor of KBR from FKTC is $8 million. FKTC has appealed this ruling. In June 2025, the appellate court affirmed the judgment in KBR’s favor and then, in July 2025, denied FKTC’s petition for a rehearing en banc. In addition, in March 2022, FKTC filed a civil action in Kuwait civil court against KBR seeking $100 million in damages. This action is duplicative of the claims decided in arbitration. In September 2022, we filed a motion to dismiss this action for lack of jurisdiction due to the arbitration agreement between KBR and FKTC. On December 7, 2023, the Kuwait Court of Cassation issued a ruling ordering KBR to pay an immaterial provisional damage award and requiring FKTC to refile its case in the Court of First Instance for adjudication. FKTC refiled its case and, in November 2024, served KBR. We are preparing a response. Based on our assessment of existing law and precedent, the opinions or views of legal counsel and the facts available to us, no amounts were accrued as of July 4, 2025.