Document and Entity Information	6 Months Ended
	Jun. 30, 2019 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Entity File Number	1-11437
Entity Registrant Name	LOCKHEED MARTIN CORPORATION
Entity Address, State or Province	MD
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	52-1893632
Entity Address, Address Line One	6801 Rockledge Drive,
Entity Address, City or Town	Bethesda,
Entity Address, Postal Zip Code	20817
City Area Code	301
Local Phone Number	897-6000
Title of 12(b) Security	Common Stock, $1 par value
Trading Symbol	LMT
Entity Central Index Key	0000936468
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding	282,397,501
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false