2.2.0.7 true Selected Financial Data by Business Segment (Parenthetical) (Detail) (Space Systems) 130 - Disclosure - Selected Financial Data by Business Segment (Parenthetical) (Detail) true false false false 1 USD true false false false Space Systems us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lmt_SpaceSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember pure Standard http://www.xbrl.org/2003/instance pure 0 iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 2 USD true false false false Space Systems us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lmt_SpaceSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember pure Standard http://www.xbrl.org/2003/instance pure 0 iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 3 USD true false false false Space Systems us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lmt_SpaceSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember pure Standard http://www.xbrl.org/2003/instance pure 0 iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false Space Systems us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lmt_SpaceSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember pure Standard http://www.xbrl.org/2003/instance pure 0 iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 2 Percentage of Equity earnings to operating profit 2 lmt_PercentageOfEquityEarningsToOperatingProfit lmt false na duration Percentage Of Equity Earnings To Operating Profit false false false false false false false false false false false false 1 false true false false 0.33 0.33 false false false 2 false true false false 0.33 0.33 false false false 3 false true false false 0.28 0.28 false false false 4 false true false false 0.26 0.26 false false false us-types:percentItemType pure Percentage Of Equity Earnings To Operating Profit No authoritative reference available. false 4 1 false UnKnown UnKnown UnKnown false true