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

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- 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

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- 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_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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