2.2.0.7 true Financial Instruments (Details) (USD $) 0615 - Disclosure - Financial Instruments (Details) true false In Millions false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Carrying amounts and estimated fair values of the Company's financial instruments 2 lll_CarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsAbstract lll false na duration Carrying amounts and estimated fair values of financial instruments 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 xbrli:stringItemType string Carrying amounts and estimated fair values of financial instruments Abstract. false 3 Senior notes, carrying amount 2 us-gaap_SeniorNotes us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 1794000000 1794 false false false 2 true true false false 996000000 996 false false false xbrli:monetaryItemType monetary Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 false 4 Senior notes, estimated fair value 2 lll_SeniorNotesEstimatedFairValue lll false credit instant Including the current and noncurrent portions, fair value as of the balance sheet date of Notes with the highest claim on the... false false false false false false false false false false false verboselabel false 1 false true false false 1845000000 1845 false false false 2 false true false false 995000000 995 false false false xbrli:monetaryItemType monetary Including the current and noncurrent portions, fair value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. No authoritative reference available. false 5 Senior subordinated notes, carrying amount 2 us-gaap_SubordinatedDebt us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2044000000 2044 false false false 2 false true false false 2440000000 2440 false false false xbrli:monetaryItemType monetary Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 false 6 Senior subordinated notes, estimated fair value 2 lll_SeniorSubordinatedNotesEstimatedFairValue lll false credit instant Including the current and noncurrent portions, fair value as of the balance sheet date of subordinated debt (with initial... false false false false false false false false false false false verboselabel false 1 false true false false 2042000000 2042 false false false 2 false true false false 2461000000 2461 false false false xbrli:monetaryItemType monetary Including the current and noncurrent portions, fair value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. No authoritative reference available. false 7 CODES, carrying amount 2 us-gaap_ConvertibleSubordinatedDebt us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 687000000 687 false false false 2 false true false false 676000000 676 false false false xbrli:monetaryItemType monetary Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 20, 22 false 8 CODES, estimated fair value 2 lll_ConvertibleSubordinatedDebtEstimatedFairValue lll false credit instant Including the current and noncurrent portions, the fair value of convertible subordinated debt, as of the balance sheet date,... false false false false false false false false false false false verboselabel false 1 false true false false 700000000 700 false false false 2 false true false false 736000000 736 false false false xbrli:monetaryItemType monetary Including the current and noncurrent portions, the fair value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. No authoritative reference available. false 10 Carrying Amount [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/financialinstrumentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 3 USD true false false false Carrying Amount [Member] us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CarryingReportedAmountFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false Carrying Amount [Member] us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CarryingReportedAmountFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 11 Carrying amounts and estimated fair values of the Company's financial instruments 2 lll_CarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsAbstract lll false na duration Carrying amounts and estimated fair values of financial instruments 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 xbrli:stringItemType string Carrying amounts and estimated fair values of financial instruments Abstract. false 18 Foreign currency forward contracts 2 us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 10000000 10 [1] false false false 2 false true false false 6000000 6 [1] false false false xbrli:monetaryItemType monetary This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. No authoritative reference available. false 19 Estimated Fair Value [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/financialinstrumentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 5 USD true false false false Estimated Fair Value [Member] us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_EstimateOfFairValueFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false Estimated Fair Value [Member] us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_EstimateOfFairValueFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 20 Carrying amounts and estimated fair values of the Company's financial instruments 2 lll_CarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsAbstract lll false na duration Carrying amounts and estimated fair values of financial instruments 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 xbrli:stringItemType string Carrying amounts and estimated fair values of financial instruments Abstract. false 27 Foreign currency forward contracts 2 us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 10000000 10 [1] false false false 2 true true false false 6000000 6 [1] false false false xbrli:monetaryItemType monetary This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. No authoritative reference available. false 1 See Note 16 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts. 2 13 false Millions UnKnown UnKnown false true