Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Jan. 19, 2022	Jun. 25, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-11437
Entity Registrant Name	LOCKHEED MARTIN CORPORATION
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, State or Province	MD
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
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth	false
Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 105.3
Entity Common Stock, Shares Outstanding		272,326,925
Documents Incorporated by Reference	Portions of Lockheed Martin Corporation’s 2022 Definitive Proxy Statement are incorporated by reference into Part III of this Form 10‑K. The 2022 Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Central Index Key	0000936468
Document Fiscal Year Focus	2021