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xbrldi http://xbrl.org/2006/xbrldi lmt_MaximumMember lmt_RangeAxis explicitMember false 10 USD true false false false lmt_MedicarePartDReimbursementMember us-gaap_IncomeTaxContingencyByTaxAuthorityAxis xbrldi http://xbrl.org/2006/xbrldi lmt_MedicarePartDReimbursementMember us-gaap_IncomeTaxContingencyByTaxAuthorityAxis explicitMember iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false lmt_ResolutionAndSettlementOfIRSExaminationMember us-gaap_IncomeTaxContingencyByTaxAuthorityAxis xbrldi http://xbrl.org/2006/xbrldi lmt_ResolutionAndSettlementOfIRSExaminationMember us-gaap_IncomeTaxContingencyByTaxAuthorityAxis explicitMember pure Standard http://www.xbrl.org/2003/instance pure 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 true false false false lmt_ResolutionAndSettlementOfIRSExaminationMember us-gaap_IncomeTaxContingencyByTaxAuthorityAxis xbrldi http://xbrl.org/2006/xbrldi lmt_ResolutionAndSettlementOfIRSExaminationMember us-gaap_IncomeTaxContingencyByTaxAuthorityAxis explicitMember pure Standard http://www.xbrl.org/2003/instance pure 0 5 Voluntary Executive Separation Charge 3 lmt_VoluntaryExecutiveSeparationProgramCharge lmt false debit duration Charge related to the Voluntary Executive Separation Program false false false false false false false false false false false false 1 true true false false 178000000 178000000 false false false 2 false false false false 0 0 false false false 3 true true false false 178000000 178000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 true true false false -178000000 -178000000 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Charge related to the Voluntary Executive Separation Program No authoritative reference available. false 6 Reduction in income tax expense related to the resolution and settlement of an IRS examination 3 us-gaap_IncomeTaxCreditsAndAdjustments us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false true false false 58 58 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 7 Reduction in net earnings 3 lmt_ReductionInNetEarnings lmt false debit duration Reduction In Net Earnings false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false true false false 116000000 116000000 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false true false false 96000000 96000000 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Reduction In Net Earnings No authoritative reference available. false 8 Increase (decrease) in net earning per share 3 lmt_IncreaseDecreaseInEarningsPerShareDiluted lmt false na duration Increase Decrease in Earnings Per Share Diluted false false false false false false false false false false false true 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 true true false false 0.32 0.32 true false false 8 true true false false 0.31 0.31 true false false 9 false false false false 0 0 true false false 10 true true false false 0.26 0.26 true false false 11 true true false false 0.15 0.15 true false false 12 false false false false 0 0 true false false us-types:perShareItemType decimal Increase Decrease in Earnings Per Share Diluted No authoritative reference available. false 9 Number of executives voluntarily participate in the program 3 lmt_NumberOfExecutivesIncludedInPlan lmt false na duration Approximate number of executives that applied to voluntarily participate in the Voluntary Executive Separation Program and... false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false true false false 600 600 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:integerItemType integer Approximate number of executives that applied to voluntarily participate in the Voluntary Executive Separation Program and were subsequently approved No authoritative reference available. false 10 Reduction of effective tax rate 3 lmt_EffectiveTaxRateAdjustments lmt false na duration Adjustments to effective tax rate false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false true false false 0.055 0.055 true false false 12 false true false false 0.019 0.019 true false false us-types:percentItemType pure Adjustments to effective tax rate No authoritative reference available. false 11 Percentage of total executive population voluntarily participate in the program 3 lmt_PercentageOfTotalExecutivePopulationInVoluntaryExecutiveSeparationProgram lmt false na duration Percentage of the approximate number of executives that applied to voluntarily participate in the Voluntary Executive... false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false true false false 0.25 0.25 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:percentItemType pure Percentage of the approximate number of executives that applied to voluntarily participate in the Voluntary Executive Separation Program and were subsequently approved No authoritative reference available. false 12 Separation date for most participants of the program 3 lmt_SeparationDate lmt false na duration The effective date of separation of employment for most participants false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 February 1, 2011 February 1, 2011 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:dateStringItemType normalizedstring The effective date of separation of employment for most participants No authoritative reference available. false 13 Maximum number of days within which cash special payment has to be made 3 lmt_NumberOfDaysFromSeparationForEffectingCashSpecialPayment lmt false na duration Number Of Days From Separation For Effecting Cash Special Payment false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 90 90 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:durationStringItemType normalizedstring Number Of Days From Separation For Effecting Cash Special Payment No authoritative reference available. false 14 Issuance of long-term notes 3 us-gaap_DebtInstrumentFaceAmount us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 5525000000 5525000000 false false false 2 false false false false 0 0 false false false 3 false true false false 5525000000 5525000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false true false false 728000000 728000000 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 false 15 Principal Amount Exchanged 3 lmt_PrincipalAmountExchanged lmt false debit instant Debt exchanged in conjunction with debt exchange. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 611000000 611000000 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Debt exchanged in conjunction with debt exchange. No authoritative reference available. false 16 Paid premium for debt exchange 3 lmt_PremiumForDebtExchange lmt false credit duration Total premium paid to faciliate an exchange of debt with the holder. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -158000000 -158000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Total premium paid to faciliate an exchange of debt with the holder. No authoritative reference available. false 17 Paid premium for debt exchange, amount in form of New Notes 3 lmt_NewDebtIssuedForDebtExchange lmt false debit duration Non-cash issuance of new notes in conjunction with debt exchange with holder. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -117000000 -117000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Non-cash issuance of new notes in conjunction with debt exchange with holder. No authoritative reference available. false 18 Paid premium for debt exchange, remaining paid in cash 3 lmt_CashPremiumForDebtExchange lmt false credit duration Cash outlflow for premium paid to facilitate an exchange of debt with the holder. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -41000000 -41000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Cash outlflow for premium paid to facilitate an exchange of debt with the holder. No authoritative reference available. false 19 Cash paid to complete the transaction 3 lmt_CashPaidForFeesAssociatedWithDebtExchange lmt false credit duration Cash outflow for fees paid in conjunction with debt exchange. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -6000000 -6000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Cash outflow for fees paid in conjunction with debt exchange. No authoritative reference available. false 20 Share repurchase program, total shares authorized for repurchase 3 lmt_SharesAuthorizedForRepurchase lmt false na instant Shares authorized for repurchase false false false false false false false false false false false false 1 false true false false 178000000 178 false false false 2 false false false false 0 0 false false false 3 false true false false 178000000 178 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:sharesItemType shares Shares authorized for repurchase No authoritative reference available. false 21 Common Stock, Par Value 3 us-gaap_CommonStockParOrStatedValuePerShare us-gaap true na instant No definition available. false false false false false false false false false false false true 1 true true false false 1 1 false false false 2 false false false false 0 0 false false false 3 true true false false 1 1 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:perShareItemType decimal Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 false 22 Common Stock Dividends 3 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 700000000 700000000 false false false 4 false true false false 668000000 668000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 23 Cash Dividends Paid Per Common Share 3 us-gaap_CommonStockDividendsPerShareCashPaid us-gaap true na duration No definition available. false false false false false false false false false false false true 1 true true false false 0.63 0.63 false false false 2 false false false false 0 0 false false false 3 true true false false 1.89 1.89 false false false 4 true true false false 1.71 1.71 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:perShareItemType decimal Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 24 Dividends Payable, per share 3 us-gaap_DividendsPayableAmountPerShare us-gaap true na instant No definition available. false false false false false false false false false false false true 1 true true false false 0.75 0.75 false false false 2 false false false false 0 0 false false false 3 true true false false 0.75 0.75 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:perShareItemType decimal The per share amount of a dividend declared, but not paid, as of the financial reporting date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 false 25 Dividends Payable, current 3 us-gaap_DividendsPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 273000000 273000000 false false false 2 false false false false 0 0 false false false 3 false true false false 273000000 273000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 false 26 Repurchases of common stock 3 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 1566000000 1566000000 false false false 4 false true false false 1362000000 1362000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 27 Repurchases of common stock, shares 3 us-gaap_StockRepurchasedDuringPeriodShares us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 19800000 19.8 false false false 4 false true false false 18300000 18.3 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:sharesItemType shares Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 1 -Section B -Paragraph 11A false 28 Total interest payments 3 us-gaap_InterestPaid us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 215000000 215000000 false false false 4 false true false false 194000000 194000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of cash paid during the current period for interest owed on money borrowed; includes amount of interest capitalized Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 29 false 29 Share repurchase program, total of shares repurchased 3 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 169000000 169.0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:sharesItemType shares Number of shares that have been repurchased and retired during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 false 30 Share repurchase program, remained shares that may be repurchased in the future 3 lmt_AvailableSharesSubjectToRepurchase lmt false na instant Available shares subject to repurchase in the future. false false false false false false false false false false false false 1 false true false false 9000000 9.0 false false false 2 false false false false 0 0 false false false 3 false true false false 9000000 9.0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:sharesItemType shares Available shares subject to repurchase in the future. No authoritative reference available. false 31 Federal and foreign income tax payments, net of refunds received 3 us-gaap_IncomeTaxesPaidNet us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 326000000 326000000 false false false 4 false true false false 702000000 702000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 29 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -Subparagraph f false 32 Federal and foreign income tax refunds received, net of payments made 3 lmt_IncomeTaxRefundsReceivedNetOfPayments lmt false debit duration Income tax refunds received net of payments made. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false true false false 325000000 325000000 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Income tax refunds received net of payments made. No authoritative reference available. false 33 Reasonably possible reduction in unrecognized tax benefits as a result of resolution of previous tax matters 3 lmt_UnrecognizedTaxBenefitsReasonablyPossibleDecreasesResultingFromSettlementsWithTaxingAuthorities lmt false debit duration Unrecognized Tax Benefits, Reasonably Possible Decreases Resulting From Settlements With Taxing Authorities false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false 270000000 270000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Unrecognized Tax Benefits, Reasonably Possible Decreases Resulting From Settlements With Taxing Authorities No authoritative reference available. false 12 29 false NoRounding HundredThousands NoRounding false true