Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 27, 2015	Mar. 28, 2014
Operating activities:
Net income	$ 109us-gaap_ProfitLoss	$ 172us-gaap_ProfitLoss
Depreciation of property, plant and equipment	44us-gaap_Depreciation	42us-gaap_Depreciation
Amortization of intangibles and other assets	11us-gaap_AmortizationOfIntangibleAssets	12us-gaap_AmortizationOfIntangibleAssets
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Stock-based employee compensation expense	13us-gaap_ShareBasedCompensation	15us-gaap_ShareBasedCompensation
Contributions to employee savings plans in L-3 Holdings' common stock	29	44
Amortization of pension and postretirement benefit plans net loss and prior service cost	17	4
Amortization of bond discounts and deferred debt issue costs (included in interest expense)	2	2
Other non-cash items	11us-gaap_OtherNoncashIncomeExpense	1us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, excluding amounts from acquisitions and divestitures:
Billed receivables	12	(73)
Contracts in process	(147)	(201)
Inventories	(31)us-gaap_IncreaseDecreaseInInventories	(9)us-gaap_IncreaseDecreaseInInventories
Other assets		(10)
Accounts payable, trade	105	55
Accrued employment costs	(4)	(10)
Accrued expenses	(58)	(56)
Advance payments and billings in excess of costs incurred	(22)	(46)
Income taxes	30	28
Excess income tax benefits related to share-based payment arrangements	(23)	(14)
Other current liabilities	5	(25)
Pension and postretirement benefits	4	(2)
All other operating activities	(31)	(14)
Net cash from (used in) operating activities	87	(62)
Investing activities:
Business acquisitions, net of cash acquired	(41)	(57)
Capital expenditures	(41)	(30)
Dispositions of property, plant and equipment	1	1
Other investing activities	6
Net cash used in investing activities	(75)	(86)
Financing activities:
Borrowings under revolving credit facility	108us-gaap_ProceedsFromLinesOfCredit	524us-gaap_ProceedsFromLinesOfCredit
Repayment of borrowings under revolving credit facility	(108)us-gaap_RepaymentsOfLinesOfCredit	(524)us-gaap_RepaymentsOfLinesOfCredit
Common stock repurchased	(100)	(133)
Dividends paid on L-3 Holdings' common stock	(58)us-gaap_PaymentsOfDividendsCommonStock	(55)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from exercises of stock options	37	69
Proceeds from employee stock purchase plan	9us-gaap_ProceedsFromStockPlans	9us-gaap_ProceedsFromStockPlans
Excess income tax benefits related to share-based payment arrangements	23	14
Other financing activities	(38)	(28)
Net cash (used in) from financing activities	(127)	(124)
Effect of foreign currency exchange rate changes on cash and cash equivalents	(11)	(1)
Change in cash balance in assets held for sale	1
Net decrease in cash and cash equivalents	(125)	(273)
Cash and cash equivalents, beginning of the period	442	500
Cash and cash equivalents, end of the period	$ 317	$ 227

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