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Pensions and Other Employee Benefits - Changes in Benefit Obligations, Plan Assets and Funded Status and Aggregate Balance Sheet Impact (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]  
Liabilities held for sale, current $ 237us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Liabilities held for sale, non-current 237us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
L-3 MSI [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Liabilities held for sale, current 162us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lll_MarineSystemsInternationalMember
Pension Plans [Member] | L-3 MSI [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Liabilities held for sale, current 3us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lll_MarineSystemsInternationalMember
Liabilities held for sale, non-current $ 56us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lll_MarineSystemsInternationalMember