Document and Entity Information
3 Months Ended
Mar. 31, 2019
Document And Entity Information [Abstract]  
Entity Registrant Name LOCKHEED MARTIN CORP
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 Type 10-Q
Document Period End Date Mar. 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q1
Amendment Flag false
Entity Common Stock, Shares Outstanding 282,538,809