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Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes (Parenthetical) (Detail) - USD ($) $ in Billions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Post retirement benefit plan adjustments, tax benefits | $ 6.5 | $ 6.2 | $ 6.4

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- Definition Tax benefits included in accumulated other comprehensive loss related to postretirement benefit plans. + References No definition available. + Details
Name: | lmt_TaxBenefitsIncludedInAccumulatedOtherComprehensiveIncomeLossRelatedToPostretirementBenefitPlans
Namespace Prefix: | lmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_AccumulatedOtherComprehensiveIncomeLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration