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OTHER - Restructuring Charges (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 27, 2016	Sep. 24, 2017	Sep. 25, 2016
Segment Reporting Information [Line Items]
Severance charges		$ 0	$ 99
Aeronautics
Segment Reporting Information [Line Items]
Severance charges	$ 80

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lmt_AeronauticsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: