Document and Entity Information
6 Months Ended
Jun. 24, 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 Jun. 24, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus Q2
Amendment Flag false
Entity Common Stock, Shares Outstanding 284,781,066