Document and Entity Information
3 Months Ended
Mar. 25, 2018
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
Document Type 10-Q
Document Period End Date Mar. 25, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY) Q1
Amendment Flag false
Entity Common Stock, Shares Outstanding 285,529,483