Restructuring Charges - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 27, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 99
Aeronautics
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 80

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are voluntarily and involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

No definition available.

Name:	lmt_SeveranceCharges
Namespace Prefix:	lmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration