Document and Entity Information
Jul. 02, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 02, 2020
Entity Registrant Name KBR, INC.
Entity Incorporation, State or Country Code DE
Entity File Number 001-33146
Entity Tax Identification Number 20-4536774
Entity Address, Address Line One 601 JEFFERSON STREET
Entity Address, Address Line Two 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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001357615
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol KBR
Security Exchange Name NYSE