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Document and Entity Information
Feb. 20, 2025
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001336920
Document Type 8-K
Document Period End Date Feb. 20, 2025
Entity Registrant Name LEIDOS HOLDINGS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-33072
Entity Tax Identification Number 20-3562868
Entity Address, Address Line One 1750 Presidents Street
Entity Address, City or Town Reston
Entity Address, State or Province VA
Entity Address, Postal Zip Code 20190
City Area Code (571)
Local Phone Number 526-6000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common stock, par value $.0001 per share
Trading Symbol LDOS
Security Exchange Name NYSE
Entity Emerging Growth Company false