2.2.0.7 true Net Pension Cost and Net Postretirement Benefit Cost Related to Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plan (Detail) (USD $) 132 - Disclosure - Net Pension Cost and Net Postretirement Benefit Cost Related to Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plan (Detail) true false In Millions false false 1 USD true false false false Qualified Defined Benefit Pension Plans us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis xbrldi http://xbrl.org/2006/xbrldi lmt_QualifiedDefinedBenefitPensionPlansMember us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 2 USD true false false false Qualified Defined Benefit Pension Plans us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis xbrldi http://xbrl.org/2006/xbrldi lmt_QualifiedDefinedBenefitPensionPlansMember us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 3 USD true false false false Qualified Defined Benefit Pension Plans us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis xbrldi http://xbrl.org/2006/xbrldi lmt_QualifiedDefinedBenefitPensionPlansMember us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false Qualified Defined Benefit Pension Plans us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis xbrldi http://xbrl.org/2006/xbrldi lmt_QualifiedDefinedBenefitPensionPlansMember us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 2 Service cost 2 us-gaap_DefinedBenefitPlanServiceCost us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 true true false false 226000000 226 false false false 2 true true false false 217000000 217 false false false 3 true true false false 677000000 677 false false false 4 true true false false 652000000 652 false false false xbrli:monetaryItemType monetary The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h false 3 Interest cost 2 us-gaap_DefinedBenefitPlanInterestCost us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 469000000 469 false false false 2 false true false false 453000000 453 false false false 3 false true false false 1407000000 1407 false false false 4 false true false false 1359000000 1359 false false false xbrli:monetaryItemType monetary The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h false 4 Expected return on plan assets 2 us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -506000000 -506 false false false 2 false true false false -507000000 -507 false false false 3 false true false false -1520000000 -1520 false false false 4 false true false false -1521000000 -1521 false false false xbrli:monetaryItemType monetary An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h false 6 Recognized net actuarial losses 2 us-gaap_DefinedBenefitPlanActuarialNetGainsLosses us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 148000000 148 false false false 2 false true false false 76000000 76 false false false 3 false true false false 446000000 446 false false false 4 false true false false 227000000 227 false false false xbrli:monetaryItemType monetary The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. 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Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments). 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No authoritative reference available. false 9 Service cost 2 us-gaap_DefinedBenefitPlanServiceCost us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 9000000 9 false false false 2 false true false false 8000000 8 false false false 3 false true false false 27000000 27 false false false 4 false true false false 26000000 26 false false false xbrli:monetaryItemType monetary The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h false 10 Interest cost 2 us-gaap_DefinedBenefitPlanInterestCost us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 42000000 42 false false false 2 false true false false 42000000 42 false false false 3 false true false false 124000000 124 false false false 4 false true false false 124000000 124 false false false xbrli:monetaryItemType monetary The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. 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The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. 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