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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: |