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Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 31, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies [Line Items]                      
Operating profit $ 1,342,000,000us-gaap_OperatingIncomeLoss $ 1,392,000,000us-gaap_OperatingIncomeLoss $ 1,426,000,000us-gaap_OperatingIncomeLoss $ 1,432,000,000us-gaap_OperatingIncomeLoss $ 834,000,000us-gaap_OperatingIncomeLoss $ 1,254,000,000us-gaap_OperatingIncomeLoss $ 1,298,000,000us-gaap_OperatingIncomeLoss $ 1,119,000,000us-gaap_OperatingIncomeLoss $ 5,592,000,000us-gaap_OperatingIncomeLoss $ 4,505,000,000us-gaap_OperatingIncomeLoss $ 4,434,000,000us-gaap_OperatingIncomeLoss
Net earnings 904,000,000us-gaap_NetIncomeLoss [1] 888,000,000us-gaap_NetIncomeLoss [1] 889,000,000us-gaap_NetIncomeLoss [1] 933,000,000us-gaap_NetIncomeLoss [1] 488,000,000us-gaap_NetIncomeLoss 873,000,000us-gaap_NetIncomeLoss 859,000,000us-gaap_NetIncomeLoss 761,000,000us-gaap_NetIncomeLoss 3,614,000,000us-gaap_NetIncomeLoss 2,981,000,000us-gaap_NetIncomeLoss 2,745,000,000us-gaap_NetIncomeLoss
Diluted earnings per share $ 2.82us-gaap_EarningsPerShareDiluted $ 2.76us-gaap_EarningsPerShareDiluted $ 2.76us-gaap_EarningsPerShareDiluted $ 2.87us-gaap_EarningsPerShareDiluted $ 1.50us-gaap_EarningsPerShareDiluted $ 2.66us-gaap_EarningsPerShareDiluted $ 2.64us-gaap_EarningsPerShareDiluted $ 2.33us-gaap_EarningsPerShareDiluted $ 11.21us-gaap_EarningsPerShareDiluted $ 9.13us-gaap_EarningsPerShareDiluted $ 8.36us-gaap_EarningsPerShareDiluted
Independent research and development costs charged to cost of sales                 751,000,000us-gaap_ResearchAndDevelopmentExpense 697,000,000us-gaap_ResearchAndDevelopmentExpense 616,000,000us-gaap_ResearchAndDevelopmentExpense
Number of years over which stock awards vest                 3 years    
Depreciation                 739,000,000us-gaap_Depreciation 714,000,000us-gaap_Depreciation 715,000,000us-gaap_Depreciation
Capitalized internal-use software, net 547,000,000lmt_CapitalizedInternalUseSoftwareNet       653,000,000lmt_CapitalizedInternalUseSoftwareNet       547,000,000lmt_CapitalizedInternalUseSoftwareNet 653,000,000lmt_CapitalizedInternalUseSoftwareNet  
Capitalized internal-use software accumulated amortization 1,800,000,000lmt_CapitalizedInternalUseSoftwareAccumulatedAmortization       1,600,000,000lmt_CapitalizedInternalUseSoftwareAccumulatedAmortization       1,800,000,000lmt_CapitalizedInternalUseSoftwareAccumulatedAmortization 1,600,000,000lmt_CapitalizedInternalUseSoftwareAccumulatedAmortization  
Non-cash goodwill impairment charge 119,000,000us-gaap_GoodwillImpairmentLoss       195,000,000us-gaap_GoodwillImpairmentLoss       119,000,000us-gaap_GoodwillImpairmentLoss [2] 195,000,000us-gaap_GoodwillImpairmentLoss [2]  
Reduction in net earnings due to non-cash goodwill impairment charge 107,000,000lmt_ReductionInNetEarningsDueToNoncashGoodwillImpairmentCharge       176,000,000lmt_ReductionInNetEarningsDueToNoncashGoodwillImpairmentCharge            
Decrease in diluted earnings per share due to non-cash goodwill impairment charge $ 0.33lmt_DecreaseInDilutedEarningsPerShareDueToNoncashGoodwillImpairmentCharge       $ 0.54lmt_DecreaseInDilutedEarningsPerShareDueToNoncashGoodwillImpairmentCharge            
Time period environmental costs and recovery of environmental costs are projected over, years                 20 years    
Fair value of trading securities 1,100,000,000us-gaap_TradingSecurities       1,000,000,000us-gaap_TradingSecurities       1,100,000,000us-gaap_TradingSecurities 1,000,000,000us-gaap_TradingSecurities  
Net gains on marketable securities                 65,000,000us-gaap_MarketableSecuritiesGainLoss 64,000,000us-gaap_MarketableSecuritiesGainLoss 67,000,000us-gaap_MarketableSecuritiesGainLoss
Total equity method investments 971,000,000us-gaap_EquityMethodInvestments       914,000,000us-gaap_EquityMethodInvestments       971,000,000us-gaap_EquityMethodInvestments 914,000,000us-gaap_EquityMethodInvestments  
Net earnings from equity method investments                 342,000,000us-gaap_IncomeLossFromEquityMethodInvestments 321,000,000us-gaap_IncomeLossFromEquityMethodInvestments 277,000,000us-gaap_IncomeLossFromEquityMethodInvestments
Contracts Accounted for under Percentage of Completion                      
Significant Accounting Policies [Line Items]                      
Operating profit                 1,800,000,000us-gaap_OperatingIncomeLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember		 2,100,000,000us-gaap_OperatingIncomeLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember		 1,900,000,000us-gaap_OperatingIncomeLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember
Net earnings                 1,100,000,000us-gaap_NetIncomeLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember		 1,300,000,000us-gaap_NetIncomeLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember		 1,200,000,000us-gaap_NetIncomeLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember
Diluted earnings per share                 $ 3.55us-gaap_EarningsPerShareDiluted
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember		 $ 4.09us-gaap_EarningsPerShareDiluted
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember		 $ 3.70us-gaap_EarningsPerShareDiluted
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember
Interest rate swaps | Designated as hedges                      
Significant Accounting Policies [Line Items]                      
Aggregate notional amount of derivatives 1,300,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		       1,200,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		       1,300,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 1,200,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Foreign currency contracts | Designated as hedges                      
Significant Accounting Policies [Line Items]                      
Aggregate notional amount of derivatives 804,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		       1,000,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		       804,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 1,000,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Space Systems                      
Significant Accounting Policies [Line Items]                      
Net earnings from equity method investments                 280,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= lmt_SpaceSystemsMember		 300,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= lmt_SpaceSystemsMember		 265,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= lmt_SpaceSystemsMember
Buildings | Minimum                      
Significant Accounting Policies [Line Items]                      
Property, plant and equipment, estimated life (years)                 10 years    
Buildings | Maximum                      
Significant Accounting Policies [Line Items]                      
Property, plant and equipment, estimated life (years)                 40 years    
Machinery and equipment | Minimum                      
Significant Accounting Policies [Line Items]                      
Property, plant and equipment, estimated life (years)                 5 years    
Machinery and equipment | Maximum                      
Significant Accounting Policies [Line Items]                      
Property, plant and equipment, estimated life (years)                 15 years    
Capitalized Software                      
Significant Accounting Policies [Line Items]                      
Capitalized internal-use software amortization                 $ 206,000,000us-gaap_AdjustmentForAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 $ 228,000,000us-gaap_AdjustmentForAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 $ 217,000,000us-gaap_AdjustmentForAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Capitalized Software | Minimum                      
Significant Accounting Policies [Line Items]                      
Property, plant and equipment, estimated life (years)                 2 years    
Capitalized Software | Maximum                      
Significant Accounting Policies [Line Items]                      
Property, plant and equipment, estimated life (years)                 6 years    
[1] The fourth quarter of 2014 included a charge of $119 million ($107 million after tax) related to a non-cash goodwill impairment charge (Note 1) and a tax benefit of $45 million due to the retroactive reinstatement of the R&D tax credit for 2014.
[2] We recognized non-cash goodwill impairment charges related to the Technical Services reporting unit within our MFC business segment in 2014 and 2013. See Note 1 for more information.