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Cover Page - shares
 6 Months Ended
Jul. 04, 2025
Jul. 23, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jul. 04, 2025  
Document Transition Report false  
Entity File Number 001-33146  
Entity Registrant Name KBR, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-4536774  
Entity Address, Address Line One 601 Jefferson Street, Suite 3400  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77002  
City Area Code 713  
Local Phone Number 753-2000  
Title of 12(b) Security Common Stock, $0.001 par value  
Trading Symbol KBR  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   128,841,636
Amendment Flag false  
Entity Central Index Key 0001357615  
Current Fiscal Year End Date --01-02  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2