Information On Business Segments (Narrative) (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Information On Business Segments [Abstract]
Percentage of net sales recorded related to the program	13.00%	12.00%	10.00%

Percentage of revenue generated from a major program that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	lmt_NetSalesFromMajorProgramPercentage
Namespace Prefix:	lmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration