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Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 21 Total Assets: 2 lll_SegmentReportingInformationTotalAssetsAbstract lll false na duration Segment Reporting Information Total Assets Abstract false false false false false true false false false false false verboselabel 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 xbrli:stringItemType string Segment Reporting Information Total Assets Abstract false 22 Total Assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1955000000 1955 false false false 2 false false false false 0 0 false false false 3 false true false false 1955000000 1955 false false false 4 false false false false 0 0 false false false 5 false true false false 1875000000 1875 [1] false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. 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Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 34 Total Assets: 2 lll_SegmentReportingInformationTotalAssetsAbstract lll false na duration Segment Reporting Information Total Assets Abstract false false false false false true false false false false false verboselabel 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 xbrli:stringItemType string Segment Reporting Information Total Assets Abstract false 35 Total Assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3395000000 3395 false false false 2 false false false false 0 0 false false false 3 false true false false 3395000000 3395 false false false 4 false false false false 0 0 false false false 5 false true false false 3285000000 3285 [1] false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. 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Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 47 Total Assets: 2 lll_SegmentReportingInformationTotalAssetsAbstract lll false na duration Segment Reporting Information Total Assets Abstract false false false false false true false false false false false verboselabel 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 xbrli:stringItemType string Segment Reporting Information Total Assets Abstract false 48 Total Assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1990000000 1990 false false false 2 false false false false 0 0 false false false 3 false true false false 1990000000 1990 false false false 4 false false false false 0 0 false false false 5 false true false false 1914000000 1914 [1] false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 53 Electronic Systems [Member] 0 na true na na No definition available. false true false false false false false false false false false http://l-3com.com/role/segmentinformationdetails 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 false 21 USD true false false false Electronic Systems [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_ElectronicSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 22 USD true false false false Electronic Systems [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_ElectronicSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 23 USD true false false false Electronic Systems [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_ElectronicSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 24 USD true false false false Electronic Systems [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_ElectronicSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 25 USD true false false false Electronic Systems [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_ElectronicSystemsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 54 Net Sales: 2 us-gaap_SegmentReportingInformationRevenueAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel 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 xbrli:stringItemType string No definition available. false 55 Net Sales 2 us-gaap_SegmentReportingInformationRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1420000000 1420 false false false 2 false true false false 1452000000 1452 [1] false false false 3 false true false false 2699000000 2699 false false false 4 false true false false 2753000000 2753 [1] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount of total revenue for the reportable segment, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a, b, c false 56 Operating Income: 2 us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel 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 xbrli:stringItemType string No definition available. false 57 Operating Income 2 us-gaap_SegmentReportingInformationOperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 199000000 199 false false false 2 false true false false 170000000 170 [1] false false false 3 false true false false 366000000 366 false false false 4 false true false false 312000000 312 [1] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount of income or loss for the reportable segment before unusual Items, equity method income or loss, income taxes, and extraordinary items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 58 Depreciation and amortization: 2 us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel 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 xbrli:stringItemType string No definition available. false 59 Depreciation and amortization 2 us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 32000000 32 false false false 2 false true false false 29000000 29 [1] false false false 3 false true false false 59000000 59 false false false 4 false true false false 57000000 57 [1] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount of depreciation, depletion, and amortization expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 60 Total Assets: 2 lll_SegmentReportingInformationTotalAssetsAbstract lll false na duration Segment Reporting Information Total Assets Abstract false false false false false true false false false false false verboselabel 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 xbrli:stringItemType string Segment Reporting Information Total Assets Abstract false 61 Total Assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 7348000000 7348 false false false 2 false false false false 0 0 false false false 3 false true false false 7348000000 7348 false false false 4 false false false false 0 0 false false false 5 false true false false 6599000000 6599 [1] false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 66 Elimination of intercompany sales [Member] 0 na true na na No definition available. false true false false false false false false false false false http://l-3com.com/role/segmentinformationdetails 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 false 26 USD true false false false Elimination of intercompany sales [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_BusinessIntersegmentEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 27 USD true false false false Elimination of intercompany sales [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_BusinessIntersegmentEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 28 USD true false false false Elimination of intercompany sales [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_BusinessIntersegmentEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 29 USD true false false false Elimination of intercompany sales [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_BusinessIntersegmentEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a, b, c false 79 Corporate [Member] 0 na true na na No definition available. false true false false false false false false false false false http://l-3com.com/role/segmentinformationdetails 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 false 30 USD true false false false Corporate [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_CorporateMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 31 USD true false false false Corporate [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_CorporateMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 86 Total Assets: 2 lll_SegmentReportingInformationTotalAssetsAbstract lll false na duration Segment Reporting Information Total Assets Abstract false false false false false true false false false false false verboselabel 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 xbrli:stringItemType string Segment Reporting Information Total Assets Abstract false 87 Total Assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 1001000000 1001 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 true true false false 1177000000 1177 [1] false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 1 As a result of a re-alignment of a business unit in the Company's management and organizational structure as discussed in Note 2, sales of $17 million and $32 million and operating income of less than $1 million and $1 million were reclassified from the Government Service reportable segment to the Electronic Systems reportable segment for the quarter and first half ended June 26, 2009. At December 31, 2009, $48 million of assets were reclassified from the Government Services reportable segment to the Electronic Systems reportable segment. 5 54 false Millions UnKnown UnKnown false true