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No authoritative reference available. false 8 3 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -22000000 -22 true false 2 false true -1634000000 -1634 true false 3 false true -471000000 -471 true false 4 false false 0 0 true false 5 false true -2127000000 -2127 false false No definition available. No authoritative reference available. false 9 3 lmt_StockBasedAwardsAndESOPActivity lmt false credit duration monetary Value of stock issued during the period as a result of the exercise of stock options, the value of stock issued during the... false false false false false false false false false 1 false true 10000000 10 true false 2 false true 879000000 879 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 889000000 889 false false Value of stock issued during the period as a result of the exercise of stock options, the value of stock issued during the period related to employee stock ownership plans, and the amount of recognized share-based compensation during the period. 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No authoritative reference available. false 15 5 lmt_OtherComprehensiveIncomePostretirementBenefitPlansReclassificationAdjustmentForRecognitionOfPriorPeriodAmountsNetOfTax lmt false credit duration monetary Amounts that were amortized as a component of expense for the year and are no longer included in accumulated other... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 179000000 179 true false 5 false true 179000000 179 false false Amounts that were amortized as a component of expense for the year and are no longer included in accumulated other comprehensive income (loss) as of the end of the year. No authoritative reference available. false 17 4 lmt_OtherComprehensiveIncomeOtherNetOfTax lmt false debit duration monetary Adjustment for other components of other comprehensive income not separately disclosed, net of tax, including deferred gains... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 4000000 4 true false 5 false true 4000000 4 false false Adjustment for other components of other comprehensive income not separately disclosed, net of tax, including deferred gains (losses) on qualifying hedges and unrealized holding gains (losses) on available-for-sale securities. No authoritative reference available. false 19 3 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 false true 409000000 409 true false 2 false true 0 0 true false 3 false true 11247000000 11247 true false 4 false true -1851000000 -1851 true false 5 false true 9805000000 9805 false false No definition available. No authoritative reference available. false 6 3 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 3217000000 3217 true false 4 false false 0 0 true false 5 false true 3217000000 3217 false false No definition available. 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No authoritative reference available. false 9 3 lmt_StockBasedAwardsAndESOPActivity lmt false credit duration monetary Value of stock issued during the period as a result of the exercise of stock options, the value of stock issued during the... false false false false false false false false false 1 false true 8000000 8 true false 2 false true 738000000 738 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 746000000 746 false false Value of stock issued during the period as a result of the exercise of stock options, the value of stock issued during the period related to employee stock ownership plans, and the amount of recognized share-based compensation during the period. No authoritative reference available. false 11 3 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 5000000 5 true false 2 false true 58000000 58 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 63000000 63 false false No definition available. No authoritative reference available. false 13 4 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 false false No definition available. false 14 5 lmt_OtherComprehensiveIncomePostretirementBenefitPlansUnrecognizedAmountsNetOfTax lmt false credit duration monetary Actuarial gains (losses) due to differences between actual experience and actuarial assumptions, and prior service credits... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -7299000000 -7299 true false 5 false true -7299000000 -7299 false false Actuarial gains (losses) due to differences between actual experience and actuarial assumptions, and prior service credits (costs) from improvements or reductions in plan benefits, each of which occurred during the year and were recognized as a component of other comprehensive income (loss) at the end of the year. No authoritative reference available. false 15 5 lmt_OtherComprehensiveIncomePostretirementBenefitPlansReclassificationAdjustmentForRecognitionOfPriorPeriodAmountsNetOfTax lmt false credit duration monetary Amounts that were amortized as a component of expense for the year and are no longer included in accumulated other... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 46000000 46 true false 5 false true 46000000 46 false false Amounts that were amortized as a component of expense for the year and are no longer included in accumulated other comprehensive income (loss) as of the end of the year. 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No authoritative reference available. false 17 4 lmt_OtherComprehensiveIncomeOtherNetOfTax lmt false debit duration monetary Adjustment for other components of other comprehensive income not separately disclosed, net of tax, including deferred gains... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 29000000 29 true false 5 false true 29000000 29 false false Adjustment for other components of other comprehensive income not separately disclosed, net of tax, including deferred gains (losses) on qualifying hedges and unrealized holding gains (losses) on available-for-sale securities. No authoritative reference available. false 19 3 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 false true 393000000 393 true false 2 false true 0 0 true false 3 false true 11621000000 11621 true false 4 false true -9149000000 -9149 true false 5 false true 2865000000 2865 false false No definition available. No authoritative reference available. false 6 3 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 3024000000 3024 true false 4 false false 0 0 true false 5 false true 3024000000 3024 false false No definition available. No authoritative reference available. false 7 3 us-gaap_DividendsCash us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -908000000 -908 true false 4 false false 0 0 true false 5 false true -908000000 -908 false false No definition available. No authoritative reference available. false 8 3 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -25000000 -25 true false 2 false true -440000000 -440 true false 3 false true -1386000000 -1386 true false 4 false false 0 0 true false 5 false true -1851000000 -1851 false false No definition available. No authoritative reference available. false 9 3 lmt_StockBasedAwardsAndESOPActivity lmt false credit duration monetary Value of stock issued during the period as a result of the exercise of stock options, the value of stock issued during the... false false false false false false false false false 1 false true 5000000 5 true false 2 false true 440000000 440 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 445000000 445 false false Value of stock issued during the period as a result of the exercise of stock options, the value of stock issued during the period related to employee stock ownership plans, and the amount of recognized share-based compensation during the period. No authoritative reference available. false 13 4 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 false false No definition available. false 14 5 lmt_OtherComprehensiveIncomePostretirementBenefitPlansUnrecognizedAmountsNetOfTax lmt false credit duration monetary Actuarial gains (losses) due to differences between actual experience and actuarial assumptions, and prior service credits... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 214000000 214 true false 5 false true 214000000 214 false false Actuarial gains (losses) due to differences between actual experience and actuarial assumptions, and prior service credits (costs) from improvements or reductions in plan benefits, each of which occurred during the year and were recognized as a component of other comprehensive income (loss) at the end of the year. No authoritative reference available. false 15 5 lmt_OtherComprehensiveIncomePostretirementBenefitPlansReclassificationAdjustmentForRecognitionOfPriorPeriodAmountsNetOfTax lmt false credit duration monetary Amounts that were amortized as a component of expense for the year and are no longer included in accumulated other... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 281000000 281 true false 5 false true 281000000 281 false false Amounts that were amortized as a component of expense for the year and are no longer included in accumulated other comprehensive income (loss) as of the end of the year. No authoritative reference available. false 16 4 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 82000000 82 true false 5 false true 82000000 82 false false No definition available. No authoritative reference available. false 17 4 lmt_OtherComprehensiveIncomeOtherNetOfTax lmt false debit duration monetary Adjustment for other components of other comprehensive income not separately disclosed, net of tax, including deferred gains... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -23000000 -23 true false 5 false true -23000000 -23 false false Adjustment for other components of other comprehensive income not separately disclosed, net of tax, including deferred gains (losses) on qualifying hedges and unrealized holding gains (losses) on available-for-sale securities. No authoritative reference available. false 19 3 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 true true 373000000 373 true false 2 true true 0 0 true false 3 true true 12351000000 12351 true false 4 true true -8595000000 -8595 true false 5 true true 4129000000 4129 false false No definition available. No authoritative reference available. false false 5 32 false Millions UnKnown UnKnown false true