Cover Page - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-11437    
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    
Entity Shell Company false    
Entity Public Float     $ 102.1
Entity Common Stock, Shares Outstanding   281,937,366  
Documents Incorporated by Reference
Portions of Lockheed Martin Corporation’s 2020 Definitive Proxy Statement are incorporated by reference into Part III of this Form 10‑K. The 2020 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 Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000936468    
Current Fiscal Year End Date --12-31