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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 22 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 23 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 1875000000 1875 [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 29 Government Services [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 11 USD true false false false Government Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_GovernmentServicesMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false Government Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_GovernmentServicesMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 13 USD true false false false Government Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_GovernmentServicesMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 14 USD true false false false Government Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_GovernmentServicesMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 15 USD true false false false Government Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_GovernmentServicesMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 30 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 31 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 1002000000 1002 false false false 2 false true false false 996000000 996 [1] false false false 3 false true false false 2939000000 2939 false false false 4 false true false false 3041000000 3041 [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 32 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 33 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 92000000 92 false false false 2 false true false false 102000000 102 [1] false false false 3 false true false false 253000000 253 false false false 4 false true false false 293000000 293 [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 34 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 35 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 9000000 9 false false false 2 false true false false 10000000 10 [1] false false false 3 false true false false 28000000 28 false false false 4 false true false false 29000000 29 [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 36 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 37 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 3304000000 3304 false false false 2 false false false false 0 0 false false false 3 false true false false 3304000000 3304 false false false 4 false false false false 0 0 false false false 5 false true false false 3293000000 3293 [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 43 AM&M [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 16 USD true false false false AM&M [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_AircraftModernizationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 17 USD true false false false AM&M [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_AircraftModernizationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 18 USD true false false false AM&M [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_AircraftModernizationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 19 USD true false false false AM&M [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_AircraftModernizationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 20 USD true false false false AM&M [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi lll_AircraftModernizationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. 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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 50 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 51 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 1962000000 1962 false false false 2 false false false false 0 0 false false false 3 false true false false 1962000000 1962 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 57 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 58 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 59 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 1353000000 1353 false false false 2 false true false false 1385000000 1385 [1] false false false 3 false true false false 4052000000 4052 false false false 4 false true false false 4138000000 4138 [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 60 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 61 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 205000000 205 false false false 2 false true false false 171000000 171 [1] false false false 3 false true false false 571000000 571 false false false 4 false true false false 483000000 483 [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 62 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 63 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 36000000 36 false false false 2 false true false false 29000000 29 [1] false false false 3 false true false false 95000000 95 false false false 4 false true false false 86000000 86 [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 64 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 65 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 7580000000 7580 false false false 2 false false false false 0 0 false false false 3 false true false false 7580000000 7580 false false false 4 false false false false 0 0 false false false 5 false true false false 6591000000 6591 [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 71 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. No authoritative reference available. false 72 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 73 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 -108000000 -108 false false false 2 false true false false -86000000 -86 [1] false false false 3 false true false false -333000000 -333 false false false 4 false true false false -206000000 -206 [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 85 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 92 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 93 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 546000000 546 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 $16 million and $48 million and operating income of $1 million and $2 million were reclassified from the Government Service reportable segment to the Electronic Systems reportable segment for the quarter and year-to-date period ended September 25, 2009. At December 31, 2009, $40 million of assets were reclassified from the Government Services reportable segment to the Electronic Systems reportable segment. 5 55 false Millions UnKnown UnKnown false true