10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 27, 2013

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                  to                 

Commission file numbers 001-14141 and 333-46983

L-3 COMMUNICATIONS HOLDINGS, INC.

L-3 COMMUNICATIONS CORPORATION

(Exact names of registrants as specified in their charters)

Delaware	13-3937434 and 13-3937436
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Nos.)
600 Third Avenue, New York, NY	10016
(Address of principal executive offices)	(Zip Code)

(212) 697-1111

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days.    x  Yes    ¨  No

Indicate by check mark whether the registrants have submitted electronically and posted on their corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrants were required to submit and post such files).    x  Yes    ¨  No

Indicate by check mark whether the registrant, L-3 Communications Holdings, Inc., is a large accelerated filer, accelerated filer, non-accelerated filer, or smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant, L-3 Communications Corporation, Inc., is a large accelerated filer, accelerated filer, non-accelerated filer, or smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	¨	Accelerated filer	¨
Non-accelerated filer	x  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrants are shell companies (as defined in Rule 12b-2 of the Act).    ¨  Yes    x  No

There were 88,625,424 shares of L-3 Communications Holdings, Inc. common stock with a par value of $0.01 outstanding as of the close of business on October 23, 2013.

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

INDEX TO QUARTERLY REPORT ON FORM 10-Q

For the quarterly period ended September 27, 2013

		Page No.
	PART I — FINANCIAL INFORMATION
ITEM 1.	Financial Statements
	Condensed Consolidated Balance Sheets as of September 27, 2013 (Unaudited) and December 31, 2012		1
	Unaudited Condensed Consolidated Statements of Operations for the Quarterly and Year-to-Date periods ended September 27, 2013 and September 28, 2012		2
	Unaudited Condensed Consolidated Statements of Comprehensive Income for the Quarterly and Year-to-Date periods ended September 27, 2013 and September 28, 2012		4
	Unaudited Condensed Consolidated Statements of Equity for the Year-to-Date periods ended September 27, 2013 and September 28, 2012		5
	Unaudited Condensed Consolidated Statements of Cash Flows for the Year-to-Date periods ended September 27, 2013 and September 28, 2012		6
	Notes to Unaudited Condensed Consolidated Financial Statements		7
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		35
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk		51
ITEM 4.	Controls and Procedures		51
	PART II — OTHER INFORMATION
ITEM 1.	Legal Proceedings		52
ITEM 1A.	Risk Factors		52
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds		53
ITEM 6.	Exhibits		53
Signature			54

PART I — FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(in millions, except share data)

	(Unaudited) September 27, 2013			December 31, 2012
ASSETS
Current assets:
Cash and cash equivalents	$	377		$	349
Billed receivables, net of allowances of $26 in 2013 and $33 in 2012		1,084			968
Contracts in process		2,691			2,636
Inventories		420			363
Deferred income taxes		98			95
Other current assets		127			144
Total current assets		4,797			4,555
Property, plant and equipment, net		1,023			1,016
Goodwill		7,757			7,776
Identifiable intangible assets		286			314
Deferred debt issue costs		25			29
Other assets		187			151
Total assets	$	14,075		$	13,841
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable, trade	$	558		$	494
Accrued employment costs		585			551
Accrued expenses		414			462
Advance payments and billings in excess of costs incurred		557			668
Income taxes		6			21
Other current liabilities		383			395
Total current liabilities		2,503			2,591
Pension and postretirement benefits		1,343			1,360
Deferred income taxes		412			328
Other liabilities		357			390
Long-term debt		3,630			3,629
Total liabilities		8,245			8,298
Commitments and contingencies (see Note 17)
Equity:
L-3 shareholders’ equity:
L-3 Communications Holdings, Inc.’s common stock: $.01 par value; 300,000,000 shares authorized, 89,047,037 shares outstanding at September 27, 2013 and 90,433,743 shares outstanding at December 31, 2012 (L-3 Communications Corporation’s common stock: $.01 par value, 100 shares authorized, issued and outstanding)		5,555			5,314
L-3 Communications Holdings, Inc.’s treasury stock (at cost), 62,194,678 shares at September 27, 2013 and 57,418,645 shares at December 31, 2012		(4,892	)		(4,488	)
Retained earnings		5,621			5,191
Accumulated other comprehensive loss		(529	)		(550	)
Total L-3 shareholders’ equity		5,755			5,467
Noncontrolling interests		75			76
Total equity		5,830			5,543
Total liabilities and equity	$	14,075		$	13,841

See notes to unaudited condensed consolidated financial statements

1

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in millions, except per share data)

	Third Quarter Ended
	September 27, 2013			September 28, 2012
Net sales:
Products	$	1,696		$	1,915
Services		1,300			1,368
Total net sales		2,996			3,283
Cost of sales:
Products		(1,486	)		(1,717	)
Services		(1,196	)		(1,235	)
Total cost of sales		(2,682	)		(2,952	)
Operating income		314			331
Interest expense		(44	)		(48	)
Interest and other income, net		3			—
Debt retirement charge		—			(8	)
Income from continuing operations before income taxes		273			275
Provision for income taxes		(65	)		(80	)
Income from continuing operations		208			195
Loss from discontinued operations, net of income taxes		—			(1	)
Net income	$	208		$	194
Net income attributable to noncontrolling interests		(4	)		(2	)
Net income attributable to L-3	$	204		$	192
Basic earnings (loss) per share attributable to L-3 Holdings’ common shareholders:
Continuing operations	$	2.28		$	2.01
Discontinued operations		—			(0.01	)
Basic earnings per share	$	2.28		$	2.00
Diluted earnings (loss) per share attributable to L-3 Holdings’ common shareholders:
Continuing operations	$	2.23		$	1.98
Discontinued operations		—			(0.01	)
Diluted earnings per share	$	2.23		$	1.97
Cash dividends paid per common share	$	0.55		$	0.50
L-3 Holdings’ weighted average common shares outstanding:
Basic		89.6			96.1
Diluted		91.3			97.4

See notes to unaudited condensed consolidated financial statements

2

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in millions, except per share data)

	Year-to-Date Ended
	September 27, 2013			September 28, 2012
Net sales:
Products	$	5,319		$	5,452
Services		4,054			4,134
Total net sales		9,373			9,586
Cost of sales:
Products		(4,729	)		(4,837	)
Services		(3,710	)		(3,762	)
Total cost of sales		(8,439	)		(8,599	)
Operating income		934			987
Interest expense		(131	)		(138	)
Interest and other income, net		11			6
Debt retirement charge		—			(8	)
Income from continuing operations before income taxes		814			847
Provision for income taxes		(226	)		(274	)
Income from continuing operations		588			573
Income from discontinued operations, net of income taxes		—			32
Net income	$	588		$	605
Net income attributable to noncontrolling interests		(6	)		(7	)
Net income attributable to L-3	$	582		$	598
Basic earnings per share attributable to L-3 Holdings’ common shareholders:
Continuing operations	$	6.47		$	5.85
Discontinued operations		—			0.29
Basic earnings per share	$	6.47		$	6.14
Diluted earnings per share attributable to L-3 Holdings’ common shareholders:
Continuing operations	$	6.37		$	5.78
Discontinued operations		—			0.28
Diluted earnings per share	$	6.37		$	6.06
Cash dividends paid per common share	$	1.65		$	1.50
L-3 Holdings’ weighted average common shares outstanding:
Basic		89.9			97.4
Diluted		91.3			98.7

See notes to unaudited condensed consolidated financial statements

3

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in millions)

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
Net income	$	208		$	194		$	588		$	605
Other comprehensive income:
Foreign currency translation adjustments		34			46			(18	)		28
Unrealized gains (losses) on hedging instruments(1)		3			2			(1	)		4
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized(2)		13			9			40			31
Total other comprehensive income:		50			57			21			63
Comprehensive income		258			251			609			668
Comprehensive income attributable to noncontrolling interests		(4	)		(2	)		(6	)		(7	)
Comprehensive income attributable to L-3	$	254		$	249		$	603		$	661

⁽¹⁾  Amounts are net of income taxes of $2 and $1 million for the quarterly periods ended September 27, 2013 and September 28, 2012, respectively, and income tax benefits of $1 million and income taxes of $2 million for the year-to-date periods ended September 27, 2013 and September 28, 2012, respectively.

⁽²⁾  Amounts are net of income taxes of $7 million and $8 million for the quarterly periods ended September 27, 2013 and September 28, 2012, respectively, and $23 million and $20 million for the year-to-date periods ended September 27, 2013 and September 28, 2012, respectively.

See notes to unaudited condensed consolidated financial statements

4

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(in millions, except per share data)

	L-3 Holdings’ Common Stock					Additional Paid-in Capital									Accumulated Other Comprehensive (Loss) Income
	Shares Outstanding			Par Value					Treasury Stock			Retained Earnings						Noncontrolling Interests			Total Equity
For the Year-to-Date Ended September 27, 2013:
Balance at December 31, 2012		90.4		$	1	$	5,313		$	(4,488	)	$	5,191		$	(550	)	$	76		$	5,543
Net income													582						6			588
Other comprehensive income																21						21
Distributions to noncontrolling interests																			(7	)		(7	)
Cash dividends paid on common stock ($1.65 per share)													(149	)								(149	)
Shares issued:
Employee savings plans		1.3					97															97
Exercise of stock options		1.3					90															90
Employee stock purchase plan		0.5					18															18
Stock-based compensation expense							42															42
Treasury stock purchased		(4.8	)							(404	)											(404	)
Other		0.3					(6	)					(3	)								(9	)
Balance at September 27, 2013		89.0		$	1	$	5,554		$	(4,892	)	$	5,621		$	(529	)	$	75		$	5,830
For the Year-to-Date Ended September 28, 2012:
Balance at December 31, 2011		99.0		$	1	$	5,063		$	(3,616	)	$	5,641		$	(454	)	$	89		$	6,724
Net income													598						7			605
Other comprehensive income																63						63
Distributions to noncontrolling interests																			(7	)		(7	)
Cash dividends paid on common stock ($1.50 per share)													(146	)								(146	)
Shares issued:
Employee savings plans		1.7					111															111
Exercise of stock options		0.2					12															12
Employee stock purchase plan		0.7					21															21
Stock-based compensation expense							46															46
Contributions received from the spin-off of Engility													335									335
Spin-off of Engility													(1,393	)					(13	)		(1,406	)
Treasury stock purchased		(7.2	)							(504	)											(504	)
Other		0.4					(10	)					(2	)								(12	)
Balance at September 28, 2012		94.8		$	1	$	5,243		$	(4,120	)	$	5,033		$	(391	)	$	76		$	5,842

See notes to unaudited condensed consolidated financial statements

5

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in millions)

	Year-to-Date Ended
	September 27, 2013			September 28, 2012
Operating activities:
Net income	$	588		$	605
Income from discontinued operations, net of tax		—			(32	)
Income from continuing operations		588			573
Depreciation of property, plant and equipment		122			124
Amortization of intangibles and other assets		36			41
Deferred income tax provision		45			50
Stock-based employee compensation expense		42			44
Contributions to employee savings plans in L-3 Holdings’ common stock		90			104
Amortization of pension and postretirement benefit plans net loss and prior service cost		63			51
Amortization of bond discounts and deferred debt issue costs (included in interest expense)		5			5
Other non-cash items		1			9
Changes in operating assets and liabilities, excluding amounts from acquisitions, divestitures and discontinued operations:
Billed receivables		(117	)		152
Contracts in process		(36	)		(351	)
Inventories		(55	)		(83	)
Other assets		(45	)		28
Accounts payable, trade		65			47
Accrued employment costs		27			35
Accrued expenses		(41	)		(137	)
Advance payments and billings in excess of costs incurred		(109	)		107
Income taxes		32			(6	)
Excess income tax benefits related to share-based payment arrangements		(3	)		(2	)
Other current liabilities		(8	)		(47	)
Pension and postretirement benefits		(23	)		(53	)
All other operating activities		(62	)		1
Net cash from operating activities from continuing operations		617			692
Investing activities:
Contribution received from the spin-off of Engility		—			335
Business acquisitions, net of cash acquired		(2	)		(349	)
Proceeds from the sale of a business		4			—
Capital expenditures		(147	)		(124	)
Dispositions of property, plant and equipment		10			6
Other investing activities		(6	)		(5	)
Net cash used in investing activities from continuing operations		(141	)		(137	)
Financing activities:
Redemption of Senior Notes		—			(250	)
Borrowings under revolving credit facility		1,382			199
Repayment of borrowings under revolving credit facility		(1,382	)		(199	)
Common stock repurchased		(404	)		(504	)
Dividends paid on L-3 Holdings’ common stock		(151	)		(149	)
Proceeds from exercises of stock options		91			12
Proceeds from employee stock purchase plan		28			30
Debt issue costs		—			(6	)
Excess income tax benefits related to share-based payment arrangements		3			2
Other financing activities		(13	)		(18	)
Net cash used in financing activities from continuing operations		(446	)		(883	)
Effect of foreign currency exchange rate changes on cash and cash equivalents		(2	)		4
Cash from (used in) discontinued operations:
Operating activities		—			75
Financing activities		—			(1	)
Cash from discontinued operations		—			74
Net increase (decrease) in cash and cash equivalents		28			(250	)
Cash and cash equivalents, beginning of the period		349			764
Cash and cash equivalents, end of the period	$	377		$	514

See notes to unaudited condensed consolidated financial statements

6

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS

1.  Description of Business

L-3 Communications Holdings, Inc. derives all of its operating income and cash flows from its wholly-owned subsidiary, L-3 Communications Corporation (L-3 Communications). L-3 Communications Holdings, Inc. (L-3 Holdings and, together with its subsidiaries, referred to herein as L-3 or the Company) is a prime contractor in Intelligence, Surveillance and Reconnaissance (ISR) systems, Command, Control, Communications (C³) systems, platform and logistics solutions for aircrafts, maritime vessels and ground vehicles, and national security solutions. L-3 is also a leading provider of a broad range of electronic systems used on military and commercial platforms. The Company’s customers include the United States (U.S.) Department of Defense (DoD) and its prime contractors, U.S. Government intelligence agencies, the U.S. Department of Homeland Security (DHS), U.S. Department of State (DoS), allied international governments, and domestic and international commercial customers.

The Company has the following four reportable segments: (1) C³ISR, (2) Electronic Systems, (3) Platform & Logistics Solutions (P&LS) and (4) National Security Solutions (NSS). Financial information with respect to each of the Company’s segments is included in Note 21. C³ISR provides products and services for the global ISR market, C³ systems, networked communication systems and secure communications products. The Company believes that these products and services are critical elements for a substantial number of major command, control and communication, intelligence gathering and space systems. These products and services are used to connect a variety of airborne, space, ground and sea-based communication systems and are used in the transmission, processing, recording, monitoring, and dissemination functions of these communication systems. Electronic Systems provides a broad range of products and services, including components, products, subsystems and systems and related services to military and commercial customers in several niche markets across several business areas. These business areas include microwave, power & control systems, marine systems international, sensor systems, simulation & training, aviation products, precision engagement, warrior systems, security & detection, space & propulsion, undersea warfare and marine services. P&LS provides modernization, upgrades and sustainment, maintenance and logistics support solutions for military and various government aircraft and other platforms. The Company sells these services primarily to the DoD, the Canadian Department of National Defence and other allied international governments. NSS provides a full range of cyber security, intelligence, enterprise information technology (IT) and security solutions services to the DoD, U.S. Government intelligence agencies, federal civilian agencies and allied international governments.

2.  Basis of Presentation

These unaudited condensed consolidated financial statements for the quarterly and nine month (year-to-date) periods ended September 27, 2013 should be read in conjunction with the audited consolidated financial statements of L-3 Holdings and L-3 Communications included in their Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

The audited condensed consolidated balance sheet as of December 31, 2012 has been revised for the final purchase price allocation of the Link Simulation & Training U.K. Limited (Link U.K.) business acquisition. Link U.K is the commercial aircraft simulation business acquired from Thales Group effective August 6, 2012. During the third quarter of 2013, the Company completed the purchase price allocation, which was based on the final appraisals and valuations of the acquired assets and liabilities and estimated final closing date net working capital. The L-3 audited condensed consolidated balance sheet as of December 31, 2012 has been adjusted in accordance with the accounting standards for business combinations. See Note 4 for additional information regarding the final purchase price allocation for Link U.K. and resulting adjustments.

7

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

Principles of Consolidation and Reporting

The accompanying financial statements comprise the consolidated financial statements of L-3 Holdings and L-3 Communications. L-3 Holdings’ only asset is its investment in the common stock of L-3 Communications, its wholly-owned subsidiary, and its only obligations are: (1) the 3% Convertible Contingent Debt Securities (CODES) due 2035, which were issued by L-3 Holdings on July 29, 2005, (2) its guarantee of borrowings under the Amended and Restated Revolving Credit Facility of L-3 Communications and (3) its guarantee of other contractual obligations of L-3 Communications and its subsidiaries. L-3 Holdings’ obligations relating to the CODES have been jointly, severally, fully and unconditionally guaranteed by L-3 Communications and certain of its wholly-owned domestic subsidiaries. Accordingly, such debt has been reflected as debt of L-3 Communications in its consolidated financial statements in accordance with the accounting standards for pushdown accounting. All issuances of and conversions into L-3 Holdings’ equity securities, including grants of stock options, restricted stock, restricted stock units and performance units by L-3 Holdings to employees and directors of L-3 Communications and its subsidiaries, have been reflected in the consolidated financial statements of L-3 Communications. As a result, the consolidated financial positions, results of operations and cash flows of L-3 Holdings and L-3 Communications are substantially the same. See Note 24 for additional information regarding the unaudited financial information of L-3 Communications and its subsidiaries.

The unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X of the SEC. Accordingly, they do not include all of the disclosures required by U.S. GAAP for a complete set of annual audited financial statements. The December 31, 2012 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair presentation of the results for the interim periods presented have been included. The results of operations for the interim periods are not necessarily indicative of results for the full year.

It is the Company’s established practice to close its books for the quarters ending March, June and September on the Friday nearest to the end of the calendar quarter. The interim unaudited condensed consolidated financial statements included herein have been prepared and are labeled based on that convention. The Company closes its books for annual periods on December 31 regardless of what day it falls on.

Accounting Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of sales and costs of sales during the reporting period. The most significant of these estimates and assumptions for L-3 relate to contract revenue, profit and loss recognition, fair values of assets acquired and liabilities assumed in business combinations, market values for inventories reported at lower of cost or market, pension and post-retirement benefit obligations, stock-based employee compensation expense, income taxes, including the valuation of deferred tax assets, litigation reserves and environmental obligations, accrued product warranty costs, and the recoverability, useful lives and valuation of recorded amounts of long-lived assets, identifiable intangible assets and goodwill. Changes in estimates are reflected in the periods during which they become known. Actual amounts will differ from these estimates and could differ materially.

8

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

Sales and profits on contracts that are covered by accounting standards for construction-type and production-type contracts and federal government contractors are recognized using percentage-of-completion (POC) methods of accounting. Approximately 48% of the Company’s net sales in 2012 were accounted for under contract accounting standards, of which, approximately 39% were fixed-price type contracts and approximately 9% were cost-plus type contracts. For contracts accounted for under contract accounting standards, sales and profits are recognized based on: (1) a POC method of accounting (fixed-price contracts), (2) allowable costs incurred plus the estimated profit on those costs (cost-plus contracts), or (3) direct labor hours expended multiplied by the contractual fixed rate per hour plus incurred costs for material (time-and-material contracts). Sales and profits on fixed-price production contracts under which units are produced and delivered in a continuous or sequential process are recorded as units are delivered based on their contractual selling prices (the “units-of-delivery” method). Sales and profits on each fixed-price production contract under which units are not produced and delivered in a continuous or sequential process, or under which a relatively few number of units are produced, are recorded based on the ratio of actual cumulative costs incurred to total estimated costs at completion of the contract multiplied by the total estimated contract revenue, less cumulative sales recognized in prior periods (the “cost-to-cost” method). Under both POC methods of accounting, a single estimated total profit margin is used to recognize profit for each contract over its entire period of performance, which can exceed one year.

Accounting for the sales and profit on these fixed-price type contracts requires the preparation of estimates of: (1) the total contract revenue, (2) the total costs at completion, which is equal to the sum of the actual incurred costs to date on the contract and the estimated costs to complete the contract’s statement of work, and (3) the measurement of progress towards completion. The estimated profit or loss at completion on a contract is equal to the difference between the total estimated contract revenue and the total estimated cost at completion. The profit recorded on a contract in any period using either the units-of-delivery method or cost-to-cost method is equal to the current estimated total profit margin multiplied by the cumulative sales recognized, less the amount of cumulative profit previously recorded for the contract.

Sales and profits on cost-plus type contracts that are covered by contract accounting standards are recognized as allowable costs are incurred on the contract, at an amount equal to the allowable costs plus the estimated profit on those costs. The estimated profit on a cost-plus type contract is fixed or variable based on the contractual fee arrangement. Incentive and award fees are the primary variable fee contractual arrangement types for the Company. Incentive and award fees on cost-plus type contracts are included as an element of total estimated contract revenues and are recorded to sales when a basis exists for the reasonable prediction of performance in relation to established contractual targets and the Company is able to make reasonably dependable estimates for them.

Sales and profits on time-and-material type contracts are recognized on the basis of direct labor hours expended multiplied by the contractual fixed rate per hour, plus the actual costs of materials and other direct non-labor costs.

Revisions or adjustments to estimates for a contract’s revenue, estimated costs at completion and estimated profit or loss are often required as work progresses under a contract, as experience is gained, as facts and circumstances change and as new information is obtained, even though the scope of work required under the contract may not change. Revisions or adjustments may also be required if contract modifications occur. The impact of revisions in profit (loss) estimates for all types of contracts subject to POC accounting are recognized on a cumulative catch-up basis in the period in which the revisions are made. The revisions in contract estimates, if significant, can materially affect the Company’s results of operations and cash flows, as well as reduce the

9

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

valuations of receivables and inventories, and in some cases result in liabilities to complete contracts in a loss position. Aggregate net changes in contract estimates increased consolidated operating income by $85 million, or 9.1%, for the year-to-date period ended September 27, 2013 and $75 million, or 7.6%, for the year-to-date period ended September 28, 2012.

For a more complete discussion of these estimates and assumptions, see the Annual Report of L-3 Holdings and L-3 Communications on Form 10-K for the fiscal year ended December 31, 2012.

3.  New Accounting Standards

Effective January 1, 2013, the Company adopted a new accounting standard issued by the Financial Accounting Standards Board (FASB), which adds new disclosure requirements for items reclassified out of accumulated other comprehensive income (loss) (AOCI). This standard requires entities to disclose additional information about reclassification adjustments, including: (1) changes in AOCI balances by component and (2) significant items reclassified out of AOCI. The adoption of this standard resulted in additional disclosures of items reclassified out of AOCI and did not impact the Company’s financial position, results of operations or cash flows. See Note 11 for these additional disclosures.

4.  Dispositions and Acquisitions

2012 Spin-off of Engility

The Company completed the spin-off of its subsidiary, Engility Holdings, Inc. (Engility), to its shareholders on July 17, 2012. L-3 incurred transaction expenses in connection with the spin-off of $19 million ($14 million after income taxes) for the year-to-date period ended September 28, 2012, which have been included in discontinued operations. In addition, L-3 allocated interest expense for debt not directly attributable or related to L-3’s other operations of $14 million to discontinued operations for the year-to-date period ended September 28, 2012. Interest expense was allocated in accordance with the accounting standards for discontinued operations and was based on the ratio of Engility net assets to the sum of: (1) total L-3 consolidated net assets and (2) L-3 consolidated total debt.

Statement of operations data classified as discontinued operations related to Engility is provided in the table below.

	Third Quarter Ended			Year-to-Date Ended
	September 28, 2012			September 28, 2012
	(in millions)
Product and service revenues	$	68		$	911
Operating income from discontinued operations before income taxes		2			68
Interest expense allocated to discontinued operations		(1	)		(14	)
Income from discontinued operations before income taxes	$	1		$	54
Income tax expense		(2	)		(22	)
(Loss) income from discontinued operations, net of income taxes	$	(1	)	$	32
Net income from discontinued operations attributable to noncontrolling interests		—			(4	)
Net (loss) income from discontinued operations attributable to L-3	$	(1	)	$	28

10

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

2012 Business Acquisitions

All of the business acquisitions discussed below are included in the Company’s results of operations from their respective dates of acquisition.

During the year ended December 31, 2012, in separate transactions, the Company acquired: (1) the Kollmorgen Electro-Optical (L-3 KEO) business, (2) the assets and liabilities of MAVCO, Inc. (MAVCO), and (3) Link U.K., for an aggregate purchase price of $349 million. All business acquisitions were financed with cash on hand. Based on the final purchase price allocations, the aggregate goodwill recognized for these acquired businesses was $282 million, of which $184 million is expected to be deductible for income tax purposes. The goodwill recognized for these three acquired businesses was assigned to the Electronic Systems segment.

The purchase prices and purchase price allocations for L-3 KEO and MAVCO were finalized as of June 28, 2013 and December 31, 2012, respectively, with no significant changes from the preliminary amounts. The Link U.K. purchase price allocation was finalized as of September 27, 2013 based on the results of the final appraisals and valuations of the assets and liabilities acquired and estimated final closing date net working capital. The final purchase price allocation resulted in certain adjustments to the preliminary valuations, the most significant of which included an increase to goodwill of $32 million, an increase to other liabilities of $17 million, and a decrease of $16 million to contracts in process. As discussed in Note 2, the audited condensed consolidated balance sheet as of December 31, 2012 has been revised for these adjustments in accordance with accounting standards for business combinations.

The final purchase price for the Link U.K. acquisition is subject to adjustment based on final closing date net working capital, which is currently in negotiation and is expected to be completed by December 31, 2013. Differences between the estimated and final closing date net working capital will impact goodwill.

Unaudited Pro Forma Statement of Operations Data

The following unaudited pro forma Statement of Operations data presents the combined results of the Company and its business acquisitions completed during the year ended December 31, 2012, in each case assuming that the business acquisitions completed during the year ended December 31, 2012 had occurred on January 1, 2012.

	Third Quarter Ended		Year-to-Date Ended
	September 28, 2012		September 28, 2012
	(in millions, except per share data)
Pro forma net sales	$	3,295	$	9,688
Pro forma income from continuing operations		195		574
Pro forma net income attributable to L-3		192		599
Pro forma diluted earnings per share from continuing operations		1.98		5.79
Pro forma diluted earnings per share		1.97		6.07

The unaudited pro forma results disclosed in the table above are based on various assumptions and are not necessarily indicative of the results of operations that would have occurred had the Company completed these acquisitions on January 1, 2012.

11

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

5.  Contracts in Process

The components of contracts in process are presented in the table below.

	September 27, 2013			December 31, 2012
	(in millions)
Unbilled contract receivables, gross	$	2,714		$	2,879
Unliquidated progress payments		(1,051	)		(1,265	)
Unbilled contract receivables, net		1,663			1,614
Inventoried contract costs, gross		1,093			1,090
Unliquidated progress payments		(65	)		(68	)
Inventoried contract costs, net		1,028			1,022
Total contracts in process	$	2,691		$	2,636

Inventoried Contract Costs. In accordance with contract accounting standards, the Company’s U.S. Government contractor businesses account for the portion of their general and administrative (G&A), independent research and development (IRAD) and bids and proposal (B&P) costs that are allowable and reimbursable indirect contract costs under U.S. Government procurement regulations on their U.S. Government contracts (revenue arrangements) as inventoried contract costs. G&A, IRAD and B&P costs are allocated to contracts for which the U.S. Government is the end customer and are charged to costs of sales when sales on the related contracts are recognized. The Company’s U.S. Government contractor businesses record the unallowable portion of their G&A, IRAD and B&P costs to expense as incurred, and do not include them in inventoried contract costs.

The table below presents a summary of G&A, IRAD and B&P costs included in inventoried contract costs and the changes to them, including amounts charged to cost of sales by the Company’s U.S. Government contractor businesses for the periods presented.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Amounts included in inventoried contract costs at beginning of the period	$	115		$	105		$	110		$	91
IRAD and B&P costs		66			83			219			254
Other G&A costs		218			213			655			647
Total contract costs incurred		284			296			874			901
Amounts charged to cost of sales		(273	)		(289	)		(858	)		(880	)
Amounts included in inventoried contract costs at end of the period	$	126		$	112		$	126		$	112

12

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

The table below presents a summary of selling, general and administrative expenses and research and development expenses for the Company’s commercial businesses, which are expensed as incurred and not included in inventoried contract costs.

.	Third Quarter Ended				Year-to-Date Ended
	September 27, 2013		September 28, 2012		September 27, 2013		September 28, 2012
	(in millions)
Selling, general and administrative expenses	$	68	$	58	$	212	$	196
Research and development expenses		17		18		62		63
Total	$	85	$	76	$	274	$	259

6.  Inventories

Inventories at Lower of Cost or Market. The table below presents the components of inventories at the lower of cost (first-in, first-out or average cost) or realizable value.

	September 27, 2013		December 31, 2012
	(in millions)
Raw materials, components and sub-assemblies	$	174	$	168
Work in process		155		124
Finished goods		91		71
Total	$	420	$	363

7.  Goodwill and Identifiable Intangible Assets

Goodwill. In accordance with the accounting standards for business combinations, the Company records the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition (commonly referred to as the purchase price allocation). The table below presents the changes in goodwill by segment for the year-to-date period ended September 27, 2013.

	C3ISR		Electronic Systems			P&LS			NSS		Consolidated Total
	(in millions)
Balance at December 31, 2012	$	797	$	4,836		$	1,175		$	968	$	7,776
Business dispositions		—		(2	)		—			—		(2	)
Foreign currency translation adjustments(1)		—		(7	)		(10	)		—		(17	)
Balance at September 27, 2013	$	797	$	4,827		$	1,165		$	968	$	7,757

⁽¹⁾  The decreases in goodwill presented in the Electronic Systems and P&LS segments were primarily due to the strengthening of the U.S. dollar against the Canadian dollar and Australian dollar, partially offset by the weakening of the U.S. dollar against the Euro during the year-to-date period ended September 27, 2013.

The Company’s accumulated goodwill impairment losses, which were recorded in the Electronic Systems segment, were $58 million at September 27, 2013 and December 31, 2012.

13

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

Identifiable Intangible Assets. Information on the Company’s identifiable intangible assets that are subject to amortization is presented in the table below.

	September 27, 2013								December 31, 2012
	Weighted Average Amortization Period		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in years)						(in millions)
Customer contractual relationships		19	$	461	$	246	$	215	$	460	$	225	$	235
Technology		11		164		105		59		164		98		66
Other		17		27		15		12		27		14		13
Total		17	$	652	$	366	$	286	$	651	$	337	$	314

Amortization expense recorded by the Company for its identifiable intangible assets is presented in the table below.

	Third Quarter Ended				Year-to-Date Ended
	September 27, 2013		September 28, 2012		September 27, 2013		September 28, 2012
	(in millions)
Amortization Expense	$	10	$	13	$	29	$	34

Based on gross carrying amounts at September 27, 2013, the Company’s estimate of amortization expense for identifiable intangible assets for the years ending December 31, 2013 through 2017 are presented in the table below.

	Year Ending December 31,
	2013		2014		2015		2016		2017
	(in millions)
Estimated amortization expense	$	38	$	42	$	39	$	32	$	31

8.  Other Current Liabilities and Other Liabilities

The table below presents the components of other current liabilities.

	September 27, 2013		December 31, 2012
	(in millions)
Other Current Liabilities:
Accruals for pending and threatened litigation (see Note 17)	$	5	$	7
Accrued product warranty costs		76		78
Estimated costs in excess of estimated contract value to complete contracts in process in a loss position		67		72
Accrued interest		46		53
Deferred revenues		38		37
Estimated contingent purchase price payable for acquired businesses		—		4
Other		151		144
Total other current liabilities	$	383	$	395

14

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

The table below presents the components of other liabilities.

	September 27, 2013		December 31, 2012
	(in millions)
Other Liabilities:
Non-current income taxes payable (see Note 10)	$	145	$	137
Accrued workers’ compensation		53		57
Deferred compensation		45		43
Accrued product warranty costs		24		22
Notes payable and capital lease obligations		17		24
Estimated contingent purchase price payable for acquired businesses		—		5
Other		73		102
Total other liabilities	$	357	$	390

The table below presents the changes in the Company’s accrued product warranty costs.

	Year-to-Date Ended
	September 27, 2013			September 28, 2012
	(in millions)
Accrued product warranty costs:(1)
Balance at January 1	$	100		$	94
Acquisitions during the period		—			2
Accruals for product warranties issued during the period		56			56
Settlements made during the period		(56	)		(58	)
Balance at end of period	$	100		$	94

⁽¹⁾  Warranty obligations incurred in connection with long-term production contracts that are accounted for under the POC cost-to-cost method are included within the contract estimates at completion and are excluded from the above amounts. The balances above include both the current and non-current amounts.

15

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

9.  Debt

The components of debt and a reconciliation to the carrying amount of long-term debt is presented in the table below.

	September 27, 2013			December 31, 2012
	(in millions)
L-3 Communications:
Borrowings under Amended and Restated Revolving Credit Facility(1)	$	—		$	—
3.95% Senior Notes due 2016		500			500
5.20% Senior Notes due 2019		1,000			1,000
4.75% Senior Notes due 2020		800			800
4.95% Senior Notes due 2021		650			650
Subtotal		2,950			2,950
L-3 Holdings:
3% Convertible Contingent Debt Securities due 2035(2)		689			689
Principal amount of long-term debt		3,639			3,639
Unamortized discounts		(9	)		(10	)
Carrying amount of long-term debt	$	3,630		$	3,629

⁽¹⁾  During the year-to-date period ended September 27, 2013, L-3 Communications’ aggregate borrowings and repayments under the Amended and Restated Revolving Credit Facility was $1,382 million. At September 27, 2013, L-3 Communications had the availability of substantially all of its $1 billion Amended and Restated Revolving Credit Facility, which expires on February 3, 2017.

⁽²⁾  Under select conditions, including if L-3 Holdings’ common stock price is more than 120% (currently $108.29) of the then current conversion price (currently $90.24) for a specified period, the conversion feature of the CODES will require L-3 Holdings, upon conversion, to pay the holders of the CODES the principal amount in cash, and if the settlement amount exceeds the principal amount, the excess will be settled in cash or stock or a combination thereof, at the Company’s option. At the current conversion price of $90.24, the aggregate consideration to be delivered upon conversion would be determined based on 7.6 million shares of L-3 Holdings’ common stock. See Note 10 to the audited consolidated financial statements for the year ended December 31, 2012, included in the Company’s Annual Report on Form 10-K, for additional information regarding the CODES, including conditions for conversion. L-3 Holdings’ closing stock price on October 23, 2013 was $95.98 share. Interest expense recognized was $5 million for both quarterly periods ended September 27, 2013 and September 28, 2012 and $15 million for both year-to-date periods ended September 27, 2013 and September 28, 2012. A portion of this interest expense was allocated to discontinued operations for the quarterly and year-to-date periods ended September 28, 2012 as a result of the spin-off of Engility. The carrying amount of the equity component (conversion feature) of the CODES was $64 million at September 27, 2013 and December 31, 2012.

16

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

10.  Income Taxes

The Company and its subsidiaries file income tax returns in the U.S. Federal jurisdiction and various state and foreign jurisdictions. As of September 27, 2013, the statutes of limitations for the Company’s U.S. Federal income tax returns for the years ended December 31, 2010 through 2012 were open. The U.S Internal Revenue Service (IRS) plans to commence an audit of the Company’s 2011 and 2010 U.S. Federal tax returns, the outcome of which cannot be predicted at this time.

The effective tax rate for the year-to-date period ended September 27, 2013 decreased to 27.8% from 32.3% for the year-to-date period ended September 28, 2012. The decrease was primarily due to a tax benefit in the year-to-date period ended September 27, 2013 of $28 million related to the U.S. Federal research and experimentation tax credit (R&E Credit), of which $17 million relates to 2012 and $11 million relates to the year-to-date period ended September 27, 2013. The R&E Credit was retroactively reinstated from January 1, 2012 to December 31, 2013 as part of the American Taxpayer Relief Act of 2012, which was signed into law on January 2, 2013. Accounting standards for income taxes require that the impact for tax law changes be recognized in the period that the law is enacted.

In the third quarter of 2013, the Company reversed previously accrued amounts relating to its provision for income taxes of $10 million for the expiration of the statutes of limitations for several tax returns, including the Company’s 2009 U.S. Federal income tax return as well as certain state and foreign tax returns. As of September 27, 2013, the Company anticipates that unrecognized tax benefits will decrease by approximately $6 million over the next 12 months due to the potential resolution of unrecognized tax benefits involving several jurisdictions and tax periods. The actual amount of the decrease over the next 12 months could vary significantly depending on the ultimate timing and nature of any settlement.

Non-current income taxes payable include accrued potential interest of $10 million ($6 million after income taxes) at September 27, 2013 and $11 million ($6 million after income taxes) at December 31, 2012, and potential penalties of $7 million at September 27, 2013 and $7 million at December 31, 2012.

11.  Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income

Amounts reclassified out of AOCI for the year-to-date period ended September 27, 2013 are presented in the table below.

	Foreign currency translation			Unrealized gains (losses) on hedging instruments			Unrecognized losses and prior service cost, net			Total accumulated other comprehensive (loss) income
	(in millions)
Balance at December 31, 2012	$	167		$	3		$	(720	)	$	(550	)
Other comprehensive loss before reclassifications, net of tax		(18	)		(2	)		—			(20	)
Amounts reclassified from other comprehensive income, net of tax		—			1			40			41
Net current period other comprehensive (loss) income		(18	)		(1	)		40			21
Balance at September 27, 2013	$	149		$	2		$	(680	)	$	(529	)

17

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

Further details regarding the amounts reclassified from AOCI for the quarterly and year-to-date periods ended September 27, 2013 are presented in the table below.

	Amount Reclassified from Accumulated Other Comprehensive (Loss) Income						Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	Third Quarter Ended			Year-to-Date Ended
Details About Accumulated Other Comprehensive (Loss) Income Components	September 27, 2013			September 27, 2013
	(in millions)
Gain on hedging instruments	$	—		$	1		Cost of sales-products
		—			1		Income from continuing operations before income taxes
		—			—		Provision for income taxes
	$	—		$	1		Income from continuing operations
Amortization of defined benefit pension items:
Net loss	$	20		$	63		(a)
		20			63		Income from continuing operations before income taxes
		(7	)		(23	)	Provision for income taxes
	$	13		$	40		Income from continuing operations
Total reclassification for the period	$	13		$	41		Income from continuing operations

^(a)  Amounts related to pension and postretirement benefit plans were reclassified from AOCI and recorded as a component of net periodic benefit cost (see Note 18 for additional information).

12.  Equity

The $1.5 billion share repurchase program authorized on April 26, 2011 by L-3 Holdings’ Board of Directors expired on April 30, 2013. On February 5, 2013, L-3 Holdings’ Board of Directors approved a new share repurchase program that authorizes L-3 Holdings to repurchase up to an additional $1.5 billion of its common stock through June 30, 2015. Repurchases of L-3 Holdings’ common stock under the February 5, 2013 share repurchase program are made at management’s discretion in accordance with applicable U.S. Federal securities laws in the open market or otherwise. The timing and actual number of shares to be repurchased in the future will depend on a variety of factors, including the Company’s financial position, earnings, legal requirements, other investment opportunities (including acquisitions), market conditions and other factors. L-3 Holdings repurchased 4.8 million shares of its common stock at an average price of $84.59 per share for an aggregate amount of $404 million from January 1, 2013 through September 27, 2013. Approximately 2.1 million of the share repurchases, for an aggregate amount of $168 million, were repurchased pursuant to the April 26, 2011 share repurchase program. The remaining share repurchases were made pursuant to the share repurchase program authorized on February 5, 2013. All share repurchases of L-3 Holdings’ common stock have been recorded as treasury shares.

18

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

At September 27, 2013, the remaining dollar value of authorization under the February 5, 2013 share repurchase program was $1,264 million. From September 28, 2013 through October 23, 2013, L-3 Holdings repurchased 527,135 shares of its common stock at an average price of $93.88 per share for an aggregate amount of $49 million under the February 5, 2013 share repurchase program.

On June 19, 2013, L-3 Holdings’ Board of Directors declared a cash dividend of $0.55 per share, which resulted in the Company paying total cash dividends of $50 million on September 16, 2013. Also, on October 22, 2013, L-3 Holdings’ Board of Directors declared a quarterly cash dividend of $0.55 per share, payable on December 16, 2013, to shareholders of record at the close of business on November 18, 2013.

19

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

13.  L-3 Holdings’ Earnings Per Common Share

A reconciliation of basic and diluted earnings per share (EPS) is presented in the table below.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions, except per share data)
Reconciliation of net income:
Net income	$	208		$	194		$	588		$	605
Net income from continuing operations attributable to noncontrolling interests		(4	)		(2	)		(6	)		(3	)
Net income from discontinued operations attributable to noncontrolling interests		—			—			—			(4	)
Net income attributable to L-3 Holdings’ common shareholders	$	204		$	192		$	582		$	598
Earnings (loss) attributable to L-3 Holdings’ common shareholders:
Continuing operations	$	204		$	193		$	582		$	570
Discontinued operations, net of income tax		—			(1	)		—			28
Net income attributable to L-3 Holdings’ common shareholders	$	204		$	192		$	582		$	598
Earnings (loss) per share attributable to L-3 Holdings’ common shareholders:
Basic:
Weighted average common shares outstanding		89.6			96.1			89.9			97.4
Basic earnings (loss) per share:
Continuing operations	$	2.28		$	2.01		$	6.47		$	5.85
Discontinued operations, net of income tax		—			(0.01	)		—			0.29
Basic earnings per share	$	2.28		$	2.00		$	6.47		$	6.14
Diluted:
Common and potential common shares:
Weighted average common shares outstanding		89.6			96.1			89.9			97.4
Assumed exercise of stock options		4.7			2.1			3.9			1.7
Unvested restricted stock awards		1.8			2.0			1.8			2.1
Employee stock purchase plan contributions		0.2			0.3			0.2			0.3
Performance unit awards		0.1			—			0.1			—
Assumed purchase of common shares for treasury		(5.2	)		(3.1	)		(4.7	)		(2.8	)
Assumed conversion of the CODES(1)		0.1			—			0.1			—
Common and potential common shares		91.3			97.4			91.3			98.7
Diluted earnings (loss) per share:
Continuing operations	$	2.23		$	1.98		$	6.37		$	5.78
Discontinued operations, net of income tax		—			(0.01	)		—			0.28
Diluted earnings per share	$	2.23		$	1.97		$	6.37		$	6.06

⁽¹⁾  L-3 Holdings’ CODES had no impact on diluted EPS for the quarterly or year-to-date periods ended September 28, 2012 as the average market price of L-3 Holdings common stock during these periods was less than the price at which the CODES would have been convertible into L-3 Holdings common stock. As of September 27, 2013, the conversion price was $90.24.

20

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

The computation of diluted EPS excluded stock options of 3.2 million for the quarterly period ended September 28, 2012, and 1.2 million and 3.5 million for the year-to-date periods ended September 27, 2013 and September 28, 2012, respectively, as they were anti-dilutive.

14.  Fair Value Measurements

The following table presents the fair value hierarchy level for each of the Company’s assets and liabilities that are measured and recorded at fair value on a recurring basis.

	September 27, 2013						December 31, 2012
Description	Level 1(1)		Level 2(2)		Level 3(3)		Level 1(1)		Level 2(2)		Level 3(3)
	(in millions)
Assets
Cash equivalents	$	199	$	—	$	—	$	284	$	—	$	—
Derivatives (foreign currency forward contracts)		—		8		—		—		8		—
Total Assets	$	199	$	8	$	—	$	284	$	8	$	—
Liabilities
Derivatives (foreign currency forward contracts)	$	—	$	2	$	—	$	—	$	3	$	—

⁽¹⁾  Level 1 is based on quoted market prices available in active markets for identical assets or liabilities as of the reporting date. Cash equivalents are primarily held in registered money market funds, which are valued using quoted market prices.

⁽²⁾  Level 2 is based on pricing inputs other than quoted prices in active markets, which are either directly or indirectly observable. The fair value is determined using a valuation model based on observable market inputs, including quoted foreign currency forward exchange rates and consideration of non-performance risk.

⁽³⁾  Level 3 is based on pricing inputs that are not observable and not corroborated by market data. The Company has no Level 3 assets or liabilities.

15.  Financial Instruments

At September 27, 2013 and December 31, 2012, the Company’s financial instruments consisted primarily of cash and cash equivalents, billed receivables, trade accounts payable, Senior Notes, CODES and foreign currency forward contracts. The carrying amounts of cash and cash equivalents, billed receivables and trade accounts payable are representative of their respective fair values because of their short-term maturities or the expected settlement dates of these instruments. The carrying amounts and estimated fair values of the Company’s financial instruments are presented in the table below.

	September 27, 2013				December 31, 2012
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
	(in millions)
Senior Notes(1)	$	2,941	$	3,131	$	2,940	$	3,301
CODES(1)		689		752		689		697
Foreign currency forward contracts(2)		6		6		5		5

⁽¹⁾  The Company measures the fair value of its Senior Notes and CODES using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market.

⁽²⁾  See Note 16 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts.

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L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

16.  Derivative Financial Instruments

The Company’s derivative financial instruments include foreign currency forward contracts, which are entered into for risk management purposes, and an embedded derivative representing the contingent interest payment provision related to the CODES.

Foreign Currency Forward Contracts. The Company’s U.S. and foreign businesses enter into contracts with customers, subcontractors or vendors that are denominated in currencies other than their functional currencies. To protect the functional currency equivalent cash flows associated with certain of these contracts, the Company enters into foreign currency forward contracts. The Company’s activities involving foreign currency forward contracts are designed to hedge the changes in the functional currency equivalent cash flows due to movements in foreign exchange rates compared to the functional currency. The foreign currencies hedged are primarily the Canadian dollar, the U.S. dollar, the Euro, and the British pound. The Company manages exposure to counterparty non-performance credit risk by entering into foreign currency forward contracts with major financial institutions that are expected to fully perform under the terms of such contracts. Foreign currency forward contracts are recorded in the Company’s condensed consolidated balance sheets at fair value and are generally designated and accounted for as cash flow hedges in accordance with the accounting standards for derivative instruments and hedging activities. Gains and losses on designated foreign currency forward contracts that are highly effective in offsetting the corresponding change in the cash flows of the hedged transactions are recorded net of income taxes in AOCI and then recognized in income when the underlying hedged transaction affects income. Gains and losses on foreign currency forward contracts that do not meet hedge accounting criteria are recognized in income immediately. Notional amounts are used to measure the volume of foreign currency forward contracts and do not represent exposure to foreign currency losses. The table below presents the notional amounts of the Company’s outstanding foreign currency forward contracts by currency at September 27, 2013.

Currency	Notional Amounts
	(in millions)
Canadian dollar	$	182
U.S. dollar		119
Euro		59
British pound		21
Total	$	381

At September 27, 2013, the Company’s foreign currency forward contracts had maturities through 2018.

Embedded Derivative. The embedded derivative related to the issuance of the CODES is recorded at fair value, which was zero at September 27, 2013 and December 31, 2012.

22

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

The table below presents the location of the Company’s derivative instruments recorded at fair value on the condensed consolidated balance sheets.

	September 27, 2013								December 31, 2012
	Other Current Assets		Other Assets		Other Current Liabilities		Other Liabilities		Other Current Assets		Other Assets		Other Current Liabilities		Other Liabilities
	(in millions)
Derivatives designated as hedging instruments:
Foreign currency forward contracts(1)	$	6	$	2	$	1	$	1	$	4	$	4	$	2	$	1
Derivatives not designated as hedging instruments:
Foreign currency forward contracts(1)		—		—		—		—		—		—		—		—
Embedded derivative related to the CODES		—		—		—		—		—		—		—		—
Total derivative instruments	$	6	$	2	$	1	$	1	$	4	$	4	$	2	$	1

⁽¹⁾  See Note 14 for a description of the fair value hierarchy related to the Company’s foreign currency forward contracts.

The effect of gains or losses from foreign currency forward contracts was not material to the unaudited condensed consolidated statements of operations for the quarterly or year-to-date periods ended September 27, 2013 and September 28, 2012. At September 27, 2013, the estimated amount of existing losses that are expected to be reclassified into income within the next 12 months is $3 million.

17.  Commitments and Contingencies

Guarantees

In connection with the spin-off of Engility, L-3 entered into a Distribution Agreement and several other agreements that govern certain aspects of L-3’s relationship with Engility, including employee matters, tax matters, transition services, and the future supplier/customer relationship between L-3 and Engility. These agreements generally provide cross-indemnities that, except as otherwise provided, are principally designed to place the financial responsibility for the obligations and liabilities of each entity with that respective entity. Engility has joint and several liability with L-3 to the U.S. Internal Revenue Service (IRS) for the consolidated U.S. Federal income taxes of L-3’s consolidated group for taxable periods in which Engility was a part of that group. However, the Tax Matters Agreement specifies the portion of this tax liability for which L-3 and Engility will each bear responsibility, and L-3 and Engility have agreed to indemnify each other against any amounts for which the other is not responsible. The Tax Matters Agreement also allocates responsibility between L-3 and Engility for other taxes, including special rules for allocating tax liabilities in the event that the spin-off is determined not to be tax-free. Though valid as between the parties, the Tax Matters Agreement is not binding on the IRS.

Procurement Regulations

A substantial majority of the Company’s revenues are generated from providing products and services under legally binding agreements or contracts with U.S. Government and foreign government customers. U.S. Government contracts are subject to extensive legal and regulatory requirements, and from time to time, agencies

23

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

of the U.S. Government investigate whether such contracts were and are being conducted in accordance with these requirements. The Company is currently cooperating with the U.S. Government on several investigations from which civil, criminal or administrative proceedings have or could result and give rise to fines, penalties, compensatory and treble damages, restitution and/or forfeitures. The Company does not currently anticipate that any of these investigations will have a material adverse effect, individually or in the aggregate, on its consolidated financial position, results of operations or cash flows. However, under U.S. Government regulations, an indictment of the Company by a federal grand jury, or an administrative finding against the Company as to its present responsibility to be a U.S. Government contractor or subcontractor, could result in the Company being suspended for a period of time from eligibility for awards of new government contracts or task orders or in a loss of export privileges. A conviction, or an administrative finding against the Company that satisfies the requisite level of seriousness, could result in debarment from contracting with the federal government for a specified term. In addition, all of the Company’s U.S. Government contracts: (1) are subject to audit and various pricing and cost controls, (2) include standard provisions for termination for the convenience of the U.S. Government or for default, and (3) are subject to cancellation if funds for contracts become unavailable. Foreign government contracts generally include comparable provisions relating to terminations for convenience and default, as well as other procurement clauses relevant to the foreign government.

Litigation Matters

The Company is also subject to litigation, proceedings, claims or assessments and various contingent liabilities incidental to its businesses, including those specified below. Furthermore, in connection with certain business acquisitions, the Company has assumed some or all claims against, and liabilities of, such acquired businesses, including both asserted and unasserted claims and liabilities.

In accordance with the accounting standard for contingencies, the Company records a liability when management believes that it is both probable that a liability has been incurred and the Company can reasonably estimate the amount of the loss. Generally, the loss is recorded at the amount the Company expects to resolve the liability. The estimated amounts of liabilities recorded for pending and threatened litigation are disclosed in Note 8. Amounts recoverable from insurance contracts or third parties are recorded as assets when deemed probable. At September 27, 2013, the Company did not record any amounts for recoveries from insurance contracts or third parties in connection with the amount of liabilities recorded for pending and threatened litigation. Legal defense costs are expensed as incurred. The Company believes it has recorded adequate provisions for its litigation matters. The Company reviews these provisions quarterly and adjusts these provisions to reflect the impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter. While it is reasonably possible that an unfavorable outcome may occur in one or more of the following matters, unless otherwise stated below, the Company believes that it is not probable that a loss has been incurred in any of these matters. With respect to the litigation matters below for which it is reasonably possible that an unfavorable outcome may occur, an estimate of loss or range of loss is disclosed when such amount or amounts can be reasonably estimated. Although the Company believes that it has valid defenses with respect to legal matters and investigations pending against it, the results of litigation can be difficult to predict, particularly those involving jury trials. Accordingly, our current judgment as to the likelihood of our loss (or our current estimate as to the potential range of loss, if applicable) with respect to any particular litigation matter may turn out to be wrong. Therefore, it is possible that the financial position, results of operations or cash flows of the Company could be materially adversely affected in any particular period by the unfavorable resolution of one or more of these or other contingencies.

24

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

Kalitta Air. On January 31, 1997, a predecessor of Kalitta Air filed a lawsuit in the U.S. District Court for the Northern District of California (the trial court) asserting, among other things, negligence and negligent misrepresentation against Central Texas Airborne Systems, Inc. (CTAS), a predecessor to L-3 Integrated Systems (L-3 IS), in connection with work performed by a predecessor to CTAS to convert two Boeing 747 aircraft from passenger configuration to cargo freighters. CTAS’ insurance carrier has accepted defense of this matter and has retained counsel, subject to a reservation of rights by the insurer to dispute its obligations under the applicable insurance policies in the event a judgment is ultimately rendered against CTAS. The work at issue in the lawsuit was performed using Supplemental Type Certificates (STCs) issued in 1988 by the Federal Aviation Administration (FAA). In 1996, following completion of the work, the FAA issued an airworthiness directive with respect to the STCs that effectively grounded the aircraft. Following two jury trials (in which Kalitta Air did not prevail) and related appeals to the U.S. Court of Appeals for the Ninth Circuit (the Court of Appeals), a third jury trial for this matter began on October 31, 2011, during which Kalitta Air sought damages of approximately $235 million plus an unspecified amount of pre-judgment interest that, in other contexts, has been claimed by Kalitta Air to exceed $240 million. Following the completion of the third trial on November 30, 2011, the jury rendered a verdict in favor of CTAS, finding no negligence on the part of CTAS. The trial court entered a judgment upon the verdict on March 20, 2012. Kalitta Air filed an appeal of the judgment with the Court of Appeals on July 23, 2012. The appeal has been fully briefed, and oral argument has been scheduled for November 8, 2013.

Bashkirian Airways. On July 1, 2004, lawsuits were filed on behalf of the estates of 31 Russian children in the state courts of Washington, Arizona, California, Florida, New York and New Jersey against Honeywell, Honeywell TCAS, Thales USA, Thales France, the Company and Aviation Communications & Surveillance Systems (ACSS), which is a joint venture of L-3 and Thales. The suits relate to the crash over southern Germany of a Bashkirian Airways Tupelov TU 154M aircraft and a DHL Boeing 757 cargo aircraft. On-board the Tupelov aircraft were 9 crew members and 60 passengers, including 45 children. The Boeing aircraft carried a crew of two. Both aircraft were equipped with Honeywell/ACSS Model 2000, Change 7 Traffic Collision and Avoidance Systems (TCAS). Sensing the other aircraft, the on-board DHL TCAS instructed the DHL pilot to descend, and the Tupelov on-board TCAS instructed the Tupelov pilot to climb. However, the Swiss air traffic controller ordered the Tupelov pilot to descend. The Tupelov pilot disregarded the on-board TCAS and put the Tupelov aircraft into a descent striking the DHL aircraft in midair at approximately 35,000 feet. All crew and passengers of both planes were lost. Investigations by the National Transportation Safety Board after the crash revealed that both TCAS units were performing as designed. The suits allege negligence and strict product liability based upon the design of the units and the training provided to resolve conflicting commands and seek approximately $315 million in damages, including $150 million in punitive damages. The Company’s insurers have accepted defense of this matter and have retained counsel. The matters were consolidated in the U.S. District Court for the District of New Jersey, which then dismissed the actions on the basis of forum non conveniens. Plaintiffs representing 30 of the estates re-filed their complaint against ACSS on April 23, 2007 with the Barcelona Court’s Registry in Spain. On March 9, 2010, the court ruled in favor of the plaintiffs and entered judgment against ACSS in the amount of approximately $6.7 million, all of which represented compensatory damages. Both ACSS and the plaintiffs appealed the judgment. In May 2012, the appellate court ruled in favor of the plaintiffs and entered judgment against ACSS in the amount of $48 million. ACSS filed an appeal of the judgment with the Supreme Court of Spain on September 28, 2012. On July 1, 2013, the Supreme Court agreed to consider the appeal, and the parties are awaiting the Supreme Court’s decision. The Company believes that the ruling and the damages awarded are inconsistent with the law and evidence presented, and accordingly, that it is not probable that the Company has incurred a loss with respect to this matter. As of the date of this filing, 18 out of the 30 plaintiffs have released their claims against ACSS in consideration for payments made by the Company’s insurance carriers.

25

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

18.  Pension and Other Postretirement Benefits

The following table summarizes the components of net periodic benefit cost for the Company’s pension and other postretirement benefit plans.

	Pension Plans												Postretirement Benefit Plans
	Third Quarter Ended						Year-to-Date Ended						Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Components of net periodic benefit cost:
Service cost	$	30		$	26		$	95		$	85		$	1		$	—		$	3		$	3
Interest cost		33			34			99			100			2			2			5			7
Expected return on plan assets		(41	)		(37	)		(124	)		(108	)		—			—			(2	)		(2	)
Amortization of prior service costs (credits)		1			1			1			1			(1	)		(1	)		(2	)		(2	)
Amortization of net loss		20			17			63			51			—			—			1			1
Curtailment loss		2			4			2			5			—			—			—			—
Net periodic benefit cost	$	45		$	45		$	136		$	134		$	2		$	1		$	5		$	7

Contributions. The Company contributed cash of $93 million to its pension plans and $5 million to its other postretirement benefit plans during the year-to-date period ended September 27, 2013. The Company expects to contribute an additional $13 million to $52 million to its pension plans and $6 million to its other postretirement benefit plans during the fourth quarter ended December 31, 2013.

19.  Employee Stock-Based Compensation

During the year-to-date period ended September 27, 2013, the Company granted stock-based compensation under the Amended and Restated 2008 Long Term Performance Plan (2008 LTPP) in the form of stock options, restricted stock units and performance units further discussed below.

Stock Options. The Company granted 741,692 stock options with an exercise price equal to the closing price of L-3 Holdings’ common stock on the date of grant. The options expire after 10 years from the date of grant and vest ratably over a three-year period on the annual anniversary of the date of grant. The options granted to our Chairman, President and Chief Executive Officer are also subject to performance-based vesting conditions. The weighted average grant date fair value for the options awarded on February 20, 2013, was $12.09 per option and was estimated using the Black-Scholes option-pricing model. The weighted average assumptions used in the valuation model for this grant are presented in the table below.

Expected holding period (in years)	5.6
Expected volatility	26.4	%
Expected dividend yield	3.6	%
Risk-free interest rate	1.0	%

Restricted Stock Units. The Company granted 604,982 restricted stock units with a weighted average grant date fair value of $77.12 per share. Restricted stock units automatically convert into shares of L-3 Holdings’ common stock upon

26

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

vesting, and are subject to forfeiture until certain restrictions have lapsed, including a three year cliff vesting period for employees and a one year cliff vesting period for non-employee directors, in each case starting on the date of grant.

Performance Units. The Company granted 61,690 performance units with a weighted average grant date fair value per unit of $77.00. The final payout for these units is based on the achievement of pre-determined EPS goals established by the compensation committee of the Company’s Board of Directors for the three-year period ending December 31, 2015. The payout can range from zero to 200% of the original number of units awarded, which are converted into shares of L-3 Holdings’ common stock based on the then existing closing price at the end of the performance period.

20.  Supplemental Cash Flow Information

	Year-to-Date Ended
	September 27, 2013		September 28, 2012
	(in millions)
Interest paid on outstanding debt	$	133	$	152
Income tax payments		168		248
Income tax refunds		20		18

21.  Segment Information

The Company has four reportable segments, as described in Note 1. The Company evaluates the performance of its operating segments and reportable segments based on their sales and operating income. All corporate expenses are allocated to the Company’s operating segments using an allocation methodology prescribed by U.S. Government regulations for government contractors. Accordingly, all costs and expenses are included in the Company’s measure of segment profitability. Certain corporate expenses of $10 million for the year-to-date period ended September 28, 2012, that had previously been allocated to the Engility businesses, were retained by the Company and have been allocated to L-3’s four reportable segments.

27

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

The tables below present net sales, operating income, depreciation and amortization and total assets by reportable segment.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Net Sales:
C3ISR	$	754		$	889		$	2,533		$	2,642
Electronic Systems		1,368			1,432			4,156			4,191
P&LS		654			715			2,022			2,033
NSS		323			353			987			1,042
Elimination of intercompany sales		(103	)		(106	)		(325	)		(322	)
Consolidated total	$	2,996		$	3,283		$	9,373		$	9,586
Operating Income:
C3ISR	$	63		$	93		$	224		$	272
Electronic Systems		173			158			468			480
P&LS		52			65			176			179
NSS		26			15			66			56
Consolidated total	$	314		$	331		$	934		$	987
Depreciation and amortization:
C3ISR	$	12		$	11		$	33		$	34
Electronic Systems		34			34			105			105
P&LS		4			4			12			15
NSS		2			5			8			11
Consolidated total	$	52		$	54		$	158		$	165

	September 27, 2013		December 31, 2012
	(in millions)
Total Assets:
C3ISR	$	2,051	$	2,030
Electronic Systems		8,277		8,077
P&LS		2,091		1,997
NSS		1,264		1,228
Corporate		392		509
Consolidated total	$	14,075	$	13,841

22.  Accounting Standards Issued and Not Yet Implemented

In July 2013, the FASB issued amendments to an accounting standard which requires an unrecognized tax benefit or portion of an unrecognized tax benefit to be presented as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward except when certain conditions exist. The amendments are effective for the Company for fiscal years beginning after December 15, 2013, including that year’s interim periods. The adoption of this standard will not impact the Company’s financial position, results of operations or cash flows.

28

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

23.  Employee Severance and Termination Costs

Consistent with the Company’s strategy to continuously improve its cost structure and right-size its businesses, especially in view of sequestration and other DoD budget reductions, L-3 is completing employment reduction actions across several of its businesses to reduce both direct and indirect costs, including overhead and general and administrative costs. As a result of these initiatives and due to the impact of sequestration at certain affected business units, the Company recorded $19 million in employee severance and other termination costs with respect to approximately 1,400 employees during the year-to-date period ended September 27, 2013. During the year ended December 31, 2012, the Company recorded a total of $23 million in employee severance and other termination costs with respect to approximately 1,600 employees. Employee severance and other termination costs are reported within cost of sales on the unaudited condensed consolidated statement of operations. The remaining balance to be paid in connection with these initiatives was $8 million at September 27, 2013 and $9 million at December 31, 2012. Employee severance and other termination costs incurred by reportable segment for the year-to-date periods ended September 27, 2013 and September 28, 2012 are presented in the table below.

	Year-to-Date Ended
	September 27, 2013		September 28, 2012
	(in millions)
Reportable Segment
C3ISR	$	5	$	4
Electronic Systems		13		14
P&LS		—		1
NSS		1		—
Consolidated	$	19	$	19

24.  Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries

L-3 Communications is a wholly-owned subsidiary of L-3 Holdings. The debt of L-3 Communications, including the Senior Notes and borrowings under amounts drawn against the Amended and Restated Revolving Credit Facility is guaranteed, on a joint and several, full and unconditional basis, by certain of its domestic subsidiaries (the “Guarantor Subsidiaries”) and, in the case of the Amended and Restated Revolving Credit Facility, by L-3 Holdings. The debt of L-3 Holdings, including the CODES, is guaranteed on a joint and several, full and unconditional basis, by L-3 Communications and the Guarantor Subsidiaries. See Note 10 to the audited consolidated financial statements for the year ended December 31, 2012, included in the Company’s Annual Report on Form 10-K. The foreign subsidiaries and certain domestic subsidiaries of L-3 Communications (the “Non-Guarantor Subsidiaries”) do not guarantee the debt of L-3 Communications or L-3 Holdings. None of the debt of L-3 Communications has been issued by its subsidiaries. There are no restrictions on the payment of dividends from the Guarantor Subsidiaries to L-3 Communications or from L-3 Communications to L-3 Holdings.

Prior to the spin-off of Engility on July 17, 2012, Engility Holdings, Inc., Engility Corporation, International Resources Group Ltd. and LinCom Wireless, Inc. were guarantor subsidiaries. As a result of the spin-off, these entities no longer guarantee the debt of L-3 Communications or L-3 Holdings. Therefore, the results of operations and cash flows of the Engility businesses have been reclassified from guarantor subsidiaries to L-3 Communications as discontinued operations in the following condensed combining financial information.

29

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

Under the terms of the indentures governing the Senior Notes, the guarantees of the Senior Notes will automatically and unconditionally be released and discharged: (1) upon the release of all guarantees of all other outstanding indebtedness of L-3 Communications Corporation, or (2) upon the determination that such guarantor is no longer a “domestic subsidiary”. Under the terms of the indenture governing the CODES, the guarantees of the CODES will be automatically and unconditionally released and discharged: (1) upon the release of guarantees of all other outstanding indebtedness of L-3 Holdings and its subsidiaries (other than a foreign subsidiary) or (2) upon the designation of such guarantor as an “excluded subsidiary.” In addition, the guarantees of the Senior Notes and the CODES will unconditionally be released and discharged in the event of a sale or other disposition of all of the assets of any guarantor, by way of merger, consolidation or otherwise, or a sale or other disposition of all of the capital stock of such guarantor.

30

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

The following unaudited condensed combining financial information presents the results of operations, financial position and cash flows of: (1) L-3 Holdings, excluding L-3 Communications and its consolidated subsidiaries (the “Parent”), (2) L-3 Communications, excluding its consolidated subsidiaries, (3) the Guarantor Subsidiaries, (4) the Non-Guarantor Subsidiaries, and (5) the eliminations to arrive at the information for L-3 on a consolidated basis.

	L-3 Holdings (Parent)		L-3 Communications		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Balance Sheets:
At September 27, 2013:
Current assets:
Cash and cash equivalents	$	—	$	154	$	1	$	244	$	(22	)	$	377
Billed receivables, net		—		381		480		223		—			1,084
Contracts in process		—		1,053		1,260		378		—			2,691
Other current assets		—		291		149		205		—			645
Total current assets		—		1,879		1,890		1,050		(22	)		4,797
Goodwill		—		2,290		4,285		1,182		—			7,757
Other assets		—		797		517		207		—			1,521
Investment in and amounts due from consolidated subsidiaries		6,444		7,075		3,584		—		(17,103	)		—
Total assets	$	6,444	$	12,041	$	10,276	$	2,439	$	(17,125	)	$	14,075
Current liabilities	$	—	$	852	$	1,038	$	635	$	(22	)	$	2,503
Amounts due to consolidated subsidiaries		—		—		—		310		(310	)		—
Other long-term liabilities		—		1,804		193		115		—			2,112
Long-term debt		689		3,630		—		—		(689	)		3,630
Total liabilities		689		6,286		1,231		1,060		(1,021	)		8,245
L-3 shareholders’ equity		5,755		5,755		9,045		1,379		(16,179	)		5,755
Noncontrolling interests		—		—		—		—		75			75
Total equity		5,755		5,755		9,045		1,379		(16,104	)		5,830
Total liabilities and equity	$	6,444	$	12,041	$	10,276	$	2,439	$	(17,125	)	$	14,075
At December 31, 2012:
Current assets:
Cash and cash equivalents	$	—	$	246	$	—	$	242	$	(139	)	$	349
Billed receivables, net		—		290		441		237		—			968
Contracts in process		—		945		1,351		340		—			2,636
Other current assets		—		248		163		191		—			602
Total current assets		—		1,729		1,955		1,010		(139	)		4,555
Goodwill		—		1,993		4,586		1,197		—			7,776
Other assets		—		734		565		211		—			1,510
Investment in and amounts due from consolidated subsidiaries		6,156		7,208		3,326		43		(16,733	)		—
Total assets	$	6,156	$	11,664	$	10,432	$	2,461	$	(16,872	)	$	13,841
Current liabilities	$	—	$	823	$	1,255	$	652	$	(139	)	$	2,591
Other long-term liabilities		—		1,745		210		123		—			2,078
Long-term debt		689		3,629		—		—		(689	)		3,629
Total liabilities		689		6,197		1,465		775		(828	)		8,298
L-3 shareholders’ equity		5,467		5,467		8,967		1,686		(16,120	)		5,467
Noncontrolling interests		—		—		—		—		76			76
Total equity		5,467		5,467		8,967		1,686		(16,044	)		5,543
Total liabilities and equity	$	6,156	$	11,664	$	10,432	$	2,461	$	(16,872	)	$	13,841

31

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

	L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Operations:
For the quarter ended September 27, 2013:
Total net sales	$	—		$	913		$	1,636		$	546		$	(99	)	$	2,996
Total cost of sales		(14	)		(855	)		(1,443	)		(483	)		113			(2,682	)
Operating (loss) income		(14	)		58			193			63			14			314
Interest expense		(5	)		(43	)		—			(1	)		5			(44	)
Interest and other income, net		—			2			1			—			—			3
(Loss) income before income taxes		(19	)		17			194			62			19			273
Benefit (provision) for income taxes		5			(3	)		(47	)		(15	)		(5	)		(65	)
Equity in net income of consolidated subsidiaries		218			190			—			—			(408	)		—
Net income		204			204			147			47			(394	)		208
Net income attributable to noncontrolling interests		—			—			—			—			(4	)		(4	)
Net income attributable to L-3	$	204		$	204		$	147		$	47		$	(398	)	$	204
Comprehensive income attributable to L-3	$	254		$	254		$	148		$	79		$	(481	)	$	254
For the quarter ended September 28, 2012:
Total net sales	$	—		$	892		$	1,929		$	550		$	(88	)	$	3,283
Total cost of sales		(15	)		(808	)		(1,743	)		(489	)		103			(2,952	)
Operating (loss) income		(15	)		84			186			61			15			331
Interest expense		(5	)		(48	)		—			—			5			(48	)
Interest and other income, net		—			3			(4	)		1			—			—
Debt retirement charge		—			(8	)		—			—			—			(8	)
(Loss) income from continuing operations before income taxes		(20	)		31			182			62			20			275
Benefit (provision) for income taxes		6			(9	)		(53	)		(18	)		(6	)		(80	)
Equity in net income of consolidated subsidiaries from continuing operations		206			171			—			—			(377	)		—
Income from continuing operations		192			193			129			44			(363	)		195
Loss from discontinued operations, net of income tax		—			(1	)		—			—			—			(1	)
Net income		192			192			129			44			(363	)		194
Net income attributable to noncontrolling interests		—			—			—			—			(2	)		(2	)
Net income attributable to L-3	$	192		$	192		$	129		$	44		$	(365	)	$	192
Comprehensive income attributable to L-3	$	249		$	249		$	129		$	92		$	(470	)	$	249

32

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

	L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Operations:
For the year-to-date ended September 27, 2013:
Total net sales	$	—		$	2,841		$	5,089		$	1,711		$	(268	)	$	9,373
Total cost of sales		(42	)		(2,630	)		(4,550	)		(1,527	)		310			(8,439	)
Operating (loss) income		(42	)		211			539			184			42			934
Interest expense		(15	)		(130	)		—			(1	)		15			(131	)
Interest and other income, net		—			6			1			4			—			11
(Loss) income from continuing operations before income taxes		(57	)		87			540			187			57			814
Benefit (provision) for income taxes		16			(24	)		(150	)		(52	)		(16	)		(226	)
Equity in net income of consolidated subsidiaries		623			519			—			—			(1,142	)		—
Net income		582			582			390			135			(1,101	)		588
Net income attributable to noncontrolling interests		—			—			—			—			(6	)		(6	)
Net income attributable to L-3	$	582		$	582		$	390		$	135		$	(1,107	)	$	582
Comprehensive income attributable to L-3	$	603		$	603		$	391		$	112		$	(1,106	)	$	603
For the year-to-date ended September 28, 2012:
Total net sales	$	—		$	2,715		$	5,476		$	1,648		$	(253	)	$	9,586
Total cost of sales		(44	)		(2,475	)		(4,936	)		(1,441	)		297			(8,599	)
Operating (loss) income		(44	)		240			540			207			44			987
Interest expense		(15	)		(138	)		—			—			15			(138	)
Interest and other income, net		—			8			(4	)		2			—			6
Debt retirement charge		—			(8	)		—			—			—			(8	)
(Loss) income from continuing operations before income taxes		(59	)		102			536			209			59			847
Benefit (provision) for income taxes		19			(32	)		(173	)		(69	)		(19	)		(274	)
Equity in net income of consolidated subsidiaries from continuing operations		638			496			—			—			(1,134	)		—
Income from continuing operations		598			566			363			140			(1,094	)		573
Income from discontinued operations, net of income tax		—			32			—			—			—			32
Net income		598			598			363			140			(1,094	)		605
Net income attributable to noncontrolling interests		—			—			—			—			(7	)		(7	)
Net income attributable to L-3	$	598		$	598		$	363		$	140		$	(1,101	)	$	598
Comprehensive income attributable to L-3	$	661		$	661		$	366		$	168		$	(1,195	)	$	661

33

L-3 COMMUNICATIONS HOLDINGS, INC.

AND L-3 COMMUNICATIONS CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED

FINANCIAL STATEMENTS — (continued)

	L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Cash Flows:
For the year-to-date ended September 27, 2013:
Operating activities:
Net cash from operating activities	$	555		$	86		$	523		$	101		$	(648	)	$	617
Investing activities:
Business acquisitions, net of cash acquired		—			(2	)		—			—			—			(2	)
Investments in L-3 Communications		(104	)		—			—			—			104			—
Other investing activities		—			(70	)		(53	)		(16	)		—			(139	)
Net cash used in investing activities		(104	)		(72	)		(53	)		(16	)		104			(141	)
Financing activities:
Common stock repurchased		(404	)		—			—			—			—			(404	)
Dividends paid on L-3 Holdings common stock		(151	)		—			—			—			—			(151	)
Dividends paid to L-3 Holdings		—			(555	)		—			—			555			—
Investments from L-3 Holdings		—			104			—			—			(104	)		—
Other financing activities		104			345			(469	)		(81	)		210			109
Net cash used in financing activities		(451	)		(106	)		(469	)		(81	)		661			(446	)
Effect of foreign currency exchange rate changes on cash		—			—			—			(2	)		—			(2	)
Net (decrease) increase in cash		—			(92	)		1			2			117			28
Cash and cash equivalents, beginning of the period		—			246			—			242			(139	)		349
Cash and cash equivalents, end of the period	$	—		$	154		$	1		$	244		$	(22	)	$	377
For the year-to-date ended September 28, 2012:
Operating activities:
Net cash from operating activities from continuing operations	$	653		$	83		$	527		$	182		$	(753	)	$	692
Investing activities:
Business acquisitions, net of cash acquired		—			(349	)		—			—			—			(349	)
Investments in L-3 Communications		(27	)		—			—			—			27			—
Other investing activities		—			262			(41	)		(9	)		—			212
Net cash used in investing activities from continuing operations		(27	)		(87	)		(41	)		(9	)		27			(137	)
Financing activities:
Redemption of senior subordinated notes		—			(250	)		—			—			—			(250	)
Common stock repurchased		(504	)		—			—			—			—			(504	)
Dividends paid on L-3 Holdings common stock		(149	)		—			—			—			—			(149	)
Dividends paid to L-3 Holdings		—			(653	)		—			—			653			—
Investments from L-3 Holdings		—			27			—			—			(27	)		—
Other financing activities		27			523			(485	)		(182	)		137			20
Net cash used in financing activities from continuing operations		(626	)		(353	)		(485	)		(182	)		763			(883	)
Effect of foreign currency exchange rate changes on cash		—			—			—			4			—			4
Net increase in cash and cash equivalents of discontinued operations		—			74			—			—			—			74
Net (decrease) increase in cash		—			(283	)		1			(5	)		37			(250	)
Cash and cash equivalents, beginning of the period		—			644			—			222			(102	)		764
Cash and cash equivalents, end of the period	$	—		$	361		$	1		$	217		$	(65	)	$	514

34

ITEM 2.

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL

CONDITION AND RESULTS OF OPERATIONS

Overview and Outlook

L-3’s Business

L-3 is a prime contractor in Intelligence, Surveillance and Reconnaissance (ISR) systems, Command, Control, Communications (C³) systems, platform and logistics solutions for aircraft, maritime vessels and ground vehicles, and national security solutions. L-3 is also a leading provider of a broad range of electronic systems used on military and commercial platforms. Our customers include the United States (U.S.) Department of Defense (DoD) and its prime contractors, U.S. Government intelligence agencies, the U.S. Department of Homeland Security (DHS), U.S. Department of State (DoS), allied international governments, and domestic and international commercial customers.

For the year ended December 31, 2012, we generated sales of $13.1 billion. Our primary customer was the DoD. The table below presents a summary of our 2012 sales by major category of end customer and the percent contributed by each to our total 2012 sales.

	2012 Sales		% of 2012 Sales
	(in millions)
DoD	$	9,376		71	%
Other U.S. Government		650		5
Total U.S. Government		10,026		76	%
Foreign governments		1,463		11
Commercial — foreign		985		8
Commercial — domestic		672		5
Total sales	$	13,146		100	%

We currently expect the percentage of our sales to the U.S. Government to decline from 76% of our total 2012 sales to approximately 74% of our total 2013 sales. U.S. Government sales include sales to the DoD, which we expect to decrease from approximately 71% of our 2012 total sales to 69% of our 2013 total sales. We also expect sales to commercial and international customers to increase to approximately 26% of our total 2013 sales compared to 24% of our total 2012 sales.

We have the following four reportable segments: (1) C³ISR, (2) Electronic Systems, (3) Platform & Logistics Solutions (P&LS), and (4) National Security Solutions (NSS). Financial information with respect to each of the Company’s segments is included in Note 21 to our unaudited condensed consolidated financial statements contained in this quarterly report. C³ISR provides products and services for the global ISR market, C³ systems, networked communication systems and secure communications products. The Company believes that these products and services are critical elements for a substantial number of major command, control and communication, intelligence gathering and space systems. These products and services are used to connect a variety of airborne, space, ground and sea-based communication systems and are used in the transmission, processing, recording, monitoring, and dissemination functions of these communication systems. Electronic Systems provides a broad range of products and services, including components, products, subsystems and systems and related services to military and commercial customers in several niche markets across several business areas. These business areas include microwave, power & control systems, marine systems international, sensor systems, simulation & training, aviation products, precision engagement, warrior systems, security & detection, space & propulsion, undersea warfare and marine services. P&LS provides modernization, upgrades and sustainment, maintenance and logistics support solutions for military and various government aircraft and

35

other platforms. The Company sells these services primarily to the DoD, the Canadian Department of National Defence (DND) and other allied international governments. NSS provides a full range of cyber security, intelligence, enterprise information technology (IT) and security solutions services to the DoD, U.S. Government intelligence agencies, federal civilian agencies and allied international governments.

Business Environment

U.S. Government Markets. Sales to U.S. Government customers represented 76% of our 2012 sales, and were primarily to DoD customers, which comprised 71% of our sales. Therefore, our annual sales are generally highly correlated to changes in U.S. Government spending levels, and especially DoD budget levels.

Recent DoD budgets are declining, compared to the DoD budget growth that occurred during the last decade. The total DoD budget (base and Overseas Contingency Operations (OCO)) for the fiscal year ended September 30, 2012 (FY 2012) was $646 billion representing a decline of 6% compared to September 30, 2011 (FY 2011). The total DoD enacted budget for the fiscal year ending September 30, 2013 (FY 2013) is $615 billion before reductions for the sequestration cuts (discussed below), representing a 5% decline compared to FY 2012. The DoD budget declines in FY 2012 and FY 2013 are primarily due to lower OCO budgets relating to the U.S. military drawdowns from Iraq and Afghanistan.

The Obama Administration’s (“Administration”) FY 2014 Proposed Budget Request (PBR) includes a base budget of $527 billion and an OCO budget of $79 billion. The FY 2014 PBR retains the national security strategy that was revised in the FY 2013 plan along five core tenets to: (1) resize U.S. Armed Forces to be smaller and leaner, but agile, flexible, ready and technologically advanced, (2) rebalance DoD’s global posture and presence to emphasize the Asia-Pacific region and the Middle East, (3) build innovative partnerships and strengthen key alliances and partnerships in all regions, (4) ensure that the U.S. can quickly confront and defeat aggression from any adversary — anytime, anywhere, and (5) protect investments in key technology areas and new capabilities, as well as DoD’s capacity to grow, adapt, and mobilize as needed. On March 1, 2013, the sequestration cuts required by the Budget Control Act of 2011 (BCA), as amended by The American Taxpayer Relief Act (ATRA), became effective. The sequestration cuts announced by the DoD in June 2013 reduced the FY 2013 DoD base budget by approximately $37 billion, with $6 billion of such reductions applied to prior-year unobligated DoD budget balances, resulting in a $31 billion sequestration cut to the FY 2013 enacted budget. Additionally, the sequestration cuts are expected to reduce the FY 2014 DoD base budget by $46 billion, and each year’s base budget by approximately $52 billion from FY 2015 to FY 2018. The table below presents the FY 2011 through FY 2013 enacted DoD budgets and the Administration’s DoD budget requests for FY 2014 to FY 2018, as provided in the FY 2014 PBR, all of which are reduced for the sequestration cuts.

	DoD Budget (before Sequestration Cuts)						Annual Total Budget Change
Fiscal Year (Ending September 30)	Base		OCO		Total
	(in billions)
2011	$	528	$	159	$	687		0	%
2012	$	531	$	115	$	646		-6	%
2013	$	502	$	82	$	584		-10	%
2014	$	475	$	79	$	554		-5	%
2015	$	489	$	37	$	526		-5	%
2016	$	499	$	37	$	536		+2	%
2017	$	508	$	37	$	545		+2	%
2018	$	517	$	37	$	554		+2	%

FY 2014, which began on October 1, 2013, started with a partial U.S. Government shutdown. On October 16, 2013, the U.S. Congress passed the Continuing Appropriations Act, 2014 (2014 CAA), which was signed by the President on October 17, 2013. The 2014 CAA (1) reopened the U.S. Government with a continuing resolution (CR) to fund the government through January 15, 2014, (2) suspends the U.S. debt

36

ceiling through February 7, 2014, and (3) calls for broader U.S. Government budget deliberations through a new bicameral budget committee to address a broad range of issues, including taxes and entitlement programs, and to report back by December 13, 2013. We do not expect the partial U.S. Government shutdown to have a significant negative impact on our results of operations and cash flows for the year ending December 31, 2013. The CR will maintain funding at the current FY 2013 appropriated level (including the FY 2013 sequestration cuts) resulting in spending caps and a prohibition on new program starts and multi-year contract awards.

While we believe that L-3 is well positioned to benefit from several of the DoD’s focus areas, declining DoD budgets will generally pressure and possibly reduce funding for some of our contracts, which could negatively impact our results of operations and cash flows. Significant uncertainty continues to exist regarding how sequestration cuts will be implemented on FY 2014 and future fiscal year DoD budgets and what challenges this may present for the defense industry, including L-3, our customers and suppliers. Further, while members of Congress and the Administration continue to discuss various options to address sequestration and the U.S. Government’s overall fiscal challenges, we cannot predict the outcome of these efforts. We do not believe the FY 2013 sequester cuts to the DoD budget of $31 billion will have a significant negative impact on our current year results of operations and cash flows. However, depending on how future sequestration cuts are implemented, we believe that sequestration could have a material, negative impact on our results of operations and cash flows in the future. In addition, declining DoD budgets due to sequestration or other DoD budget reductions could also potentially trigger non-cash goodwill impairment charges depending on how these reductions impact each of our reporting units. (See the discussion regarding goodwill in “Part II — Item 7 — Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies” included in our Annual Report on Form 10-K for the year ended December 31, 2012.)

Commercial and International Markets. Sales to end customers other than the U.S. Government represented 24% of our 2012 sales and we expect those sales to represent 26% of our total 2013 sales. These sales are generally affected by global economic conditions for our commercial end markets and foreign government security and military priorities, as well as the fiscal situations of our foreign government end customers.

Key Performance Measures

The primary financial performance measures that we use to manage our businesses and monitor results of operations are sales and operating income trends. Management believes that these financial performance measures are the primary growth drivers for our earnings and cash flow per common share. Generally, in evaluating our businesses and contract performance, we focus on net sales, operating income and operating margin, and not by type or amount of operating costs.

One of our primary business objectives is to increase sales from organic growth and select business acquisitions. We define organic sales growth as the increase or decrease in sales for the current period compared to the prior period, excluding sales in the: (1) current period from business acquisitions that are included in our actual results of operations for less than twelve months, and (2) prior period from business divestitures that are included in our actual results of operations for the twelve-month period prior to the divestiture date. We expect to supplement, strengthen and enhance our existing businesses by selectively acquiring businesses that: (1) add important new technologies and products, (2) provide access to select customers, programs and contracts and (3) provide attractive returns on investment. Another important financial performance measure that we use is operating margin, which we define as operating income as a percentage of sales, because sales growth combined with operating margin levels determine our operating income levels.

Sales Trend. For the quarter ended September 27, 2013 (2013 Third Quarter), consolidated net sales of $2,996 million decreased by $287 million, or 8.7%, due to a decrease in organic sales of $296 million, or 9.0%, partially offset by net sales from acquisitions of $9 million, or 0.3%, compared to the quarter ended September 28, 2012 (2012 Third Quarter).

For the year-to-date period ended September 27, 2013 (2013 Year-to-Date Period), consolidated net sales of $9,373 million decreased by $213 million, or 2.2%, due primarily to a decrease in organic sales of $294 million,

37

or 3.1%, partially offset by net sales from acquisitions of $81 million, or 0.9%, compared to the year-to-date period ended September 28, 2012 (2012 Year-to-Date Period). See Results of Operations, including segment results below for a discussion of sales.

For the year ended December 31, 2012, our largest contract (revenue arrangement) in terms of annual sales was the Fort Rucker Maintenance Support contract with the U.S. Army Aviation and Missile Life Cycle Management Command (AMCOM), which is included in our P&LS segment. Under this contract, which generated approximately 4% of our 2012 sales, we provide maintenance, logistics and other related sustainment support services for rotary wing aircraft assigned to Fort Rucker and satellite units in Alabama.

Our sales trends are highly correlated to DoD budget levels because we derived approximately 71% of our 2012 sales from the DoD. DoD budgets are a function of several factors and uncertainties beyond our control, including, but not limited to, changes in U.S. procurement policies, budget considerations, current and future economic conditions, presidential administration priorities, U.S. military engagements, changing national security and defense requirements, geo-political developments, actual fiscal year congressional appropriations for defense budgets, and the outcome of the BCA sequestration cuts and continuing budget negotiations, as well as potential future U.S. Government shutdowns or failure to lift the debt ceiling. Any of these factors could result in a significant increase, decrease or redirection of DoD budgets and impact our future results of operations, including our sales and operating income growth rates. Additionally, our future results of operations will be affected by our ability to retain our existing business, including our revenue arrangements with DoD customers, and to successfully compete for new business, which largely depends on: (1) our successful performance on existing contracts, (2) the effectiveness and innovation of our technologies and research and development activities, (3) our ability to offer better program performance than our competitors at an affordable cost, and (4) our ability to retain our employees and hire new ones, particularly those employees who have U.S. Government security clearances.

Operating Income Trend. Operating income for the 2013 Third Quarter was $314 million, a decrease of 5% from $331 million for the 2012 Third Quarter. Our operating margin was 10.5% for the 2013 Third Quarter, an increase of 40 basis points from 10.1% for the 2012 Third Quarter.

Operating income for the 2013 Year-to-Date Period was $934 million, a decrease of 5% from $987 million for the 2012 Year-to-Date Period. Our operating margin was 10.0% for the 2013 Year-to-Date Period, a decrease of 30 basis points from 10.3% for the 2012 Year-to-Date Period. See Results of Operations, including segment results below for a discussion of operating margin.

While we are continuing to undertake cost management actions, such as reducing our indirect costs, resizing select business units, and improving our overall contract performance in an effort to maintain or even increase operating margin, these efforts may not be successful. Changes in the competitive environment and DoD procurement practices, reductions to the DoD budget, changes in our annual pension expense and lower consolidated sales have resulted in a lower operating margin in the 2013 Year-to-Date Period compared to the 2012 Year-to-Date Period. Furthermore, select business acquisitions and select new business, including contract renewals and new contracts, could have lower operating margins than L-3’s operating margins on existing business and contracts. We also expect our 2013 annual operating margin to decline as compared to 2012.

Business Acquisitions and Dispositions

Our Annual Report on Form 10-K for the fiscal year ended December 31, 2012 summarizes the business acquisitions and dispositions that we completed during the three years ended December 31, 2012. On July 17, 2012, we completed the spin-off of our subsidiary, Engility Holdings, Inc. (Engility), to our shareholders. See Note 4 to our unaudited condensed consolidated financial statements contained in this quarterly report for the impact of the spin-off of Engility on our 2012 Third Quarter and 2012 Year-to-Date Period financial results.

38

Results of Operations

The following information should be read in conjunction with our unaudited condensed consolidated financial statements contained in this quarterly report. The following information for the 2012 Third Quarter and 2012 Year-to-Date Period have been adjusted to reflect the spin-off of Engility and related classification of results of operations and cash flows as discontinued operations. Also, our results of operations for the periods presented are affected by our business acquisitions. See Note 4 to our audited consolidated financial statements for the year ended December 31, 2012, included in our Annual Report on Form 10-K, for a discussion of our 2012 business acquisitions.

Consolidated Results of Operations

The table below provides selected financial data, excluding discontinued operations, for L-3 for the 2013 Third Quarter compared with the 2012 Third Quarter and the 2013 Year-to-Date Period compared with the 2012 Year-to-Date Period.

	Third Quarter Ended						Increase/ (decrease)			Year-to-Date Ended						Increase/ (decrease)
(in millions, except per share data)	September 27, 2013			September 28, 2012						September 27, 2013			September 28, 2012
Net sales	$	2,996		$	3,283			(8.7	)%	$	9,373		$	9,586			(2.2	)%
Operating income	$	314		$	331			(5.1	)%	$	934		$	987			(5.4	)%
Operating margin		10.5	%		10.1	%		40	bpts		10.0	%		10.3	%		(30	) bpts
Interest expense	$	44		$	48			(8.3	)%	$	131			138			(5.1	)%
Interest and other income, net	$	3		$	—			nm		$	11		$	6			nm
Debt retirement charge	$	—		$	8			nm		$	—		$	8			nm
Effective income tax rate		23.8	%		29.1	%		(530	) bpts		27.8	%		32.3	%		(450	) bpts
Net income from continuing operations attributable to L-3	$	204		$	193			5.7	%	$	582		$	570			2.1	%
Diluted earnings per share from continuing operations	$	2.23		$	1.98			12.6	%	$	6.37		$	5.78			10.2	%
Diluted weighted average common shares outstanding		91.3			97.4			(6.3	)%		91.3			98.7			(7.5	)%
nm   — not meaningful

Net Sales: For the 2013 Third Quarter, consolidated net sales of $3.0 billion decreased $287 million, or 9%, compared to the 2012 Third Quarter as lower sales to the DoD impacted each segment. Acquired businesses, which are all included in the Electronic Systems segment, added $9 million to net sales in the 2013 Third Quarter. Net sales to commercial and international customers increased 2%, or $20 million, to $828 million in the 2013 Third Quarter, including $9 million from acquired businesses, compared to $808 million in the 2012 Third Quarter. Net sales to commercial and international customers, as a percentage of consolidated net sales, increased to 28% for the 2013 Third Quarter compared to 25% for the 2012 Third Quarter.

Sales of products decreased by $219 million to $1,696 million for the 2013 Third Quarter, compared to $1,915 million for the 2012 Third Quarter. Sales of products represented approximately 57% of consolidated net sales for the 2013 Third Quarter and 58% of consolidated net sales for the 2012 Third Quarter. Sales of products decreased for: (1) networked communication systems primarily due to lower volume due to contracts nearing completion and declining demand caused by sequestration, other DoD budget reductions and the drawdown from Afghanistan, as well as lower productivity due to the implementation of new enterprise resource planning (ERP) systems, (2) Microwave Products due to reduced deliveries of power devices for commercial satellite systems and mobile and ground-based satellite communication systems for the U.S. military, (3) Platform Solutions primarily due to lower volume for Australia C-27J aircraft, (4) Sensor Systems due to lower volume primarily for airborne EO/IR turrets due to the U.S. military drawdown from Afghanistan, and

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(5) Security & Detection Systems primarily due to order delays from the Transportation Security Administration (TSA). These decreases were partially offset by sales from the recently acquired Link Simulation & Training U.K Limited (Link U.K.) business, and organic sales growth for Warrior Systems due to increased demand for night vision and illumination products for the U.S. Army and holographic weapon sights for the sporting and recreation market.

Sales of services decreased by $68 million to $1,300 million for the 2013 Third Quarter, compared to $1,368 million for the 2012 Third Quarter. Sales of services represented approximately 43% of consolidated net sales for the 2013 Third Quarter and 42% of consolidated net sales for the 2012 Third Quarter. Sales of services decreased primarily due to lower volume for small ISR aircraft systems due to the drawdown from Afghanistan and lower demand for a technical support contract for a U.S. Government agency and information technology (IT) support services for the U.S. Special Operations Command (USSOCOM).

For the 2013 Year-to-Date Period, consolidated net sales of $9.4 billion decreased $213 million, or 2%, compared to the 2012 Year-to-Date Period as lower sales to the DoD impacted each segment. Acquired businesses, which are all included in the Electronic Systems segment, added $81 million to net sales in the 2013 Year-to-Date Period. Net sales to commercial and international customers increased 12%, or $268 million, to $2,491 million in the 2013 Year-to-Date Period, including $74 million from acquired businesses, compared to $2,223 million in the 2012 Year-to-Date Period. Net sales to commercial and international customers, as a percentage of consolidated net sales, increased to 27% for the 2013 Year-to-Date Period compared to 23% for the 2012 Year-to-Date Period.

Sales of products decreased by $133 million to $5,319 million for the 2013 Year-to-Date Period, compared to $5,452 million for the 2012 Year-to-Date Period. Sales of products represented approximately 57% of consolidated net sales for both the 2013 Year-to-Date Period and 2012 Year-to-Date Period. Sales of products decreased due to: (1) networked communication systems primarily due to reasons similar to those discussed above for the 2013 Third Quarter, (2) Microwave Products due to a decline in deliveries of power devices for commercial satellite communication systems, (3) Sensor Systems primarily due to lower volume for the Persistent Threat Detection System (PTDS) contract, (4) Security & Detection Systems primarily due to order delays from the TSA and the completion of certain international contracts, and (5) Space & Propulsion Systems primarily due to certain funding constraints for the Missile Defense Agency’s (MDA) air-launched target programs. These decreases were partially offset by sales from the recently acquired Link U.K. and Kollmorgen Electro-Optical (L-3 KEO) businesses and organic sales growth for: (1) Platform Solutions due to increased volume for modifications for the U.S. Air Force (USAF) EC-130 aircraft and international head of state aircraft, (2) Simulation & Training due to upgrades for F/A-18 flight simulator trainers and increased deliveries of U.S. Army rotary wing training systems for the Flight School XXI program, and (3) Warrior Systems due to increased demand for holographic weapon sights for the sporting and recreation market.

Sales of services decreased by $80 million to $4,054 million for the 2013 Year-to-Date Period, compared to $4,134 million for the 2012 Year-to-Date Period. Sales of services represented approximately 43% of consolidated net sales for both the 2013 Year-to-Date Period and the 2012 Year-to-Date Period. Sales of services decreased due to lower volume for Logistics Solutions, primarily due to the competitive loss of a task order for U.S. Army contract field team support services in Southwest Asia and reduced fleet management services due to the loss of the Joint Primary Aircraft Training Systems (JPATS) contract for the USAF. Sales from services also declined due to lower demand for technical support for a U.S. Government agency and IT support services for USSOCOM.

See the segment results below for additional discussion of our sales.

Operating income and operating margin: Operating income for the 2013 Third Quarter of $314 million decreased $17 million, or 5%, as compared to the 2012 Third Quarter. Operating margin increased by 40 basis points to 10.5% for the 2013 Third Quarter compared to 10.1% for the 2012 Third Quarter. The increase in operating margin is primarily due to improved contract performance for the Electronic Systems segment and lower operating costs at NSS, partially offset by higher costs and reduced productivity for the C³ISR segment.

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Higher pension expense of $3 million ($2 million after income taxes, or $0.02 per diluted share) reduced operating margin by 10 basis points. In addition, both the 2013 Third Quarter and the 2012 Third Quarter included severance charges that reduced operating income by $5 million.

Operating income for the 2013 Year-to-Date Period of $934 million decreased $53 million, or 5%, as compared to the 2012 Year-to-Date Period. Operating margin decreased by 30 basis points to 10.0% for the 2013 Year-to-Date Period compared to 10.3% for the 2012 Year-to-Date Period. The decrease in operating margin is primarily due to higher design and production costs for the C³ISR segment. In addition, acquired businesses reduced operating margin by 10 basis points and higher pension expense of $11 million ($7 million after income taxes, or $0.08 per diluted share) reduced operating margin by 10 basis points. Furthermore, both the 2013 Year-to-Date Period and the 2012 Year-to-Date Period included severance charges that reduced operating income by $19 million.

See the segment results below for additional discussion of our operating margin.

Interest expense: Interest expense for the 2013 Third Quarter declined by $4 million, primarily due to lower outstanding debt. The increase in interest and other income, net, was primarily due to a $3 million ($2 million after income tax, or $0.02 per diluted share) non-cash impairment charge in the 2012 Third Quarter related to the dissolution of an unconsolidated joint venture.

Interest expense for the 2013 Year-to-Date Period declined by $7 million, as lower outstanding debt reduced interest expense by $21 million, which was partially offset by $14 million of interest expense that was allocated to discontinued operations in the 2012 Year-to-Date Period. The increase in interest and other income, net, was primarily due to the $3 million non-cash impairment charge recorded in the 2012 Third Quarter.

Effective income tax rate: The effective tax rate for the 2013 Third Quarter decreased to 23.8% from 29.1% for the same period last year. The decrease is primarily due to a $14 million tax benefit in the 2013 Third Quarter for the U.S. Federal research and experimentation tax credit. Tax benefits related to the reversal of amounts accrued for tax years in which the statute of limitations had expired were $10 million for the 2013 Third Quarter and $11 million for the 2012 Third Quarter.

The effective tax rate for the 2013 Year-to-Date Period decreased to 27.8% from 32.3% for the same period last year. The decrease is primarily due to a tax benefit in the 2013 Year-to-Date Period of $28 million ($0.31 per diluted share) for the U.S. Federal research and experimentation tax credit, of which $17 million ($0.19 per diluted share) relates to 2012. Tax benefits related to the reversal of amounts accrued for tax years in which the statute of limitations had expired were $10 million for the 2013 Year-to-Date Period and $11 million for the 2012 Year-to-Date Period.

Net income from continuing operations attributable to L-3 and diluted earnings per share (EPS) from continuing operations: Net income from continuing operations attributable to L-3 in the 2013 Third Quarter increased 6% to $204 million compared to the 2012 Third Quarter, and diluted EPS from continuing operations increased 13% to $2.23 from $1.98.

Net income from continuing operations attributable to L-3 in the 2013 Year-to-Date Period increased $12 million to $582 million compared to the 2012 Year-to-Date Period, and diluted EPS from continuing operations increased 10% to $6.37 from $5.78.

Diluted weighted average common shares outstanding: Diluted weighted average common shares outstanding for the 2013 Third Quarter and the 2013 Year-to-Date Period declined by 6% and 7%, respectively, compared to the same periods last year. The decreases were due to repurchases of our common stock in connection with our share repurchase program authorized by our Board of Directors, partially offset by additional shares issued in connection with various employee stock-based compensation programs and contributions to employee savings plans made in common stock.

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Segment Results of Operations

The table below presents selected data by segment reconciled to consolidated totals. See Note 21 to our unaudited condensed consolidated financial statements contained in this quarterly report for additional segment data.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(dollars in millions)
Net sales:(1)
C3ISR	$	750		$	886		$	2,521		$	2,634
Electronic Systems		1,333			1,395			4,040			4,060
P&LS		590			649			1,827			1,854
NSS		323			353			985			1,038
Consolidated net sales	$	2,996		$	3,283		$	9,373		$	9,586
Operating income:
C3ISR	$	63		$	93		$	224		$	272
Electronic Systems		173			158			468			480
P&LS		52			65			176			179
NSS		26			15			66			56
Consolidated operating income	$	314		$	331		$	934		$	987
Operating margin:
C3ISR		8.4	%		10.5	%		8.9	%		10.3	%
Electronic Systems		13.0	%		11.3	%		11.6	%		11.8	%
P&LS		8.8	%		10.0	%		9.6	%		9.7	%
NSS		8.0	%		4.2	%		6.7	%		5.4	%
Consolidated operating margin		10.5	%		10.1	%		10.0	%		10.3	%

⁽¹⁾  Net sales are after intercompany eliminations.

C³ISR

	Third Quarter Ended						Decrease			Year-to-Date Ended						Decrease
	September 27, 2013			September 28, 2012						September 27, 2013			September 28, 2012
	(dollars in millions)
Net sales	$	750		$	886			(15.3	)%	$	2,521		$	2,634			(4.3	)%
Operating income	$	63		$	93			(32.3	)%	$	224		$	272			(17.6	)%
Operating margin		8.4	%		10.5	%		(210	) bpts		8.9	%		10.3	%		(140	) bpts

C³ISR net sales for the 2013 Third Quarter decreased by $136 million, or 15%, compared to the 2012 Third Quarter. Sales decreased by $90 million for networked communication systems and $46 million for ISR Systems. The decrease in sales for networked communication systems was due to: (1) lower volume for airborne and ground-based systems due to contracts nearing completion and declining demand caused by sequestration and other DoD budget reductions, (2) lower U.S. Army demand for remote video terminals primarily due to the U.S. military drawdown from Afghanistan, and (3) lower productivity due to the implementation of new ERP systems during the third quarter which caused sales volume to decline by approximately $45 million. The decrease in sales for ISR Systems was due to lower volume for small ISR aircraft systems of $70 million primarily due to the drawdown from Afghanistan. This decrease was partially offset by higher volume on ISR platforms for foreign military customers and logistics support and fleet management services for U.S. Government customers.

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C³ISR operating income for the 2013 Third Quarter of $63 million, which included severance charges of $2 million, decreased by $30 million, or 32%, compared to the 2012 Third Quarter. Operating margin decreased by 210 basis points to 8.4%. Higher costs and lower productivity due to the implementation of new ERP systems at networked communication systems during the 2013 Third Quarter reduced operating margin by 140 basis points. In addition, lower sales volume for networked communication systems reduced operating margin by 120 basis points. Higher pension expense of $4 million reduced operating margin by 50 basis points. These decreases were partially offset by an increase of 100 basis points primarily due to improved productivity on certain contracts for ISR Systems.

C³ISR net sales for the 2013 Year-to-Date Period decreased by $113 million, or 4%, compared to the 2012 Year-to-Date Period. Sales decreased $146 million for networked communication systems, which was partially offset by an increase of $33 million for ISR Systems. The decrease in sales for networked communication systems was due to: (1) declining U.S. Army demand for remote video terminals due to the U.S. military drawdown from Afghanistan, (2) lower volume for airborne and ground-based systems and vehicle mounted satellite communication ground stations due to contracts nearing completion and declining demand caused by sequestration and other DoD budget reductions, and (3) lower productivity due to the implementation of new ERP systems during the third quarter. The increase in sales for ISR Systems was primarily due to small ISR aircraft sales to the DoD.

C³ISR operating income for the 2013 Year-to-Date Period of $224 million, which included severance charges of $5 million, decreased by $48 million, or 18%, compared to the 2012 Year-to-Date Period. Operating margin decreased by 140 basis points to 8.9%. Operating margin declined by 200 basis points primarily due to higher design and production costs for select contracts and 40 basis points for higher costs and lower productivity due to the implementation of new ERP systems at networked communication systems. Higher pension expense of $12 million reduced operating margin by 50 basis points. These decreases were partially offset by 80 basis points primarily due to sales mix changes and 70 basis points due to improved productivity on certain contracts for ISR Systems.

Electronic Systems

	Third Quarter Ended						Increase/ (decrease)			Year-to-Date Ended						Decrease
	September 27, 2013			September 28, 2012						September 27, 2013			September 28, 2012
	(dollars in millions)
Net sales	$	1,333		$	1,395			(4.4	)%	$	4,040		$	4,060			(0.5	)%
Operating income	$	173		$	158			9.5	%	$	468		$	480			(2.5	)%
Operating margin		13.0	%		11.3	%		170	bpts		11.6	%		11.8	%		(20	) bpts

Electronic Systems net sales for the 2013 Third Quarter decreased by $62 million, or 4%, compared to the 2012 Third Quarter. Sales declined by $98 million primarily for: (1) Microwave Products due to reduced deliveries of power devices for commercial satellite communication systems and mobile and ground-based satellite communication systems for the U.S. military as programs ended, (2) Security & Detection Systems due to order delays from the TSA, and (3) Sensor Systems due to lower volume primarily for airborne EO/IR turrets due to the U.S. military drawdown from Afghanistan. These declines were partially offset by $27 million of increased demand, primarily for Warrior Systems’ night vision and illumination products for the U.S. Army and holographic weapon sights for the sporting and recreation market. Sales also increased from the Link U.K. acquisition by $9 million.

Electronic Systems operating income for the 2013 Third Quarter of $173 million, which included severance charges of $3 million, increased by $15 million, or 9%, compared to the 2012 Third Quarter. Operating margin increased by 170 basis points to 13.0%. Operating margin increased by: (1) 80 basis points due to improved contract performance across several business areas, including Microwave Products, Space & Propulsion Systems,

43

Sensor Systems and Marine Services, (2) 60 basis points, or $8 million, due to a reduction in the estimated fair value of previously accrued contingent consideration for business acquisitions, and (3) 30 basis points due to sales mix changes for Aviation Products.

Electronic Systems net sales for the 2013 Year-to-Date Period decreased by $20 million, or 0.5%, compared to the 2012 Year-to-Date Period. Sales declined by $192 million primarily for: (1) Microwave Products due to a decline in deliveries of power devices for commercial satellite communication systems, (2) Space & Propulsion Systems due to certain funding constraints for the MDA’s air-launched target programs, (3) Security & Detection Systems due to order delays from the TSA and the completion of certain international contracts, and (4) Sensor Systems due to lower volume primarily for airborne EO/IR turrets for the PTDS contract due to the U.S. military drawdown from Afghanistan. These decreases were partially offset by a sales increase of $91 million primarily for Simulation & Training due to upgrades for F/A-18 flight simulator trainers and increased deliveries of U.S. Army rotary wing training systems for the Flight School XXI program and Warrior Systems due to increased demand for holographic weapon sights for the sporting and recreation market. Sales also increased by $81 million primarily due to the Link U.K. and L-3 KEO acquisitions.

Electronic Systems operating income for the 2013 Year-to-Date Period of $468 million, which included severance charges of $13 million, decreased by $12 million, or 3%, compared to the 2012 Year-to-Date Period. Operating margin decreased by 20 basis points to 11.6%. Sales declines and mix changes were mostly offset by improved contract performance across several business areas, including Microwave Products and Space & Propulsion Systems. Sales from acquired businesses reduced operating margin by 20 basis points.

P&LS

	Third Quarter Ended						Decrease			Year-to-Date Ended						Decrease
	September 27, 2013			September 28, 2012						September 27, 2013			September 28, 2012
	(dollars in millions)
Net sales	$	590		$	649			(9.1	)%	$	1,827		$	1,854			(1.5	)%
Operating income	$	52		$	65			(20.0	)%	$	176		$	179			(1.7	)%
Operating margin		8.8	%		10.0	%		(120	) bpts		9.6	%		9.7	%		(10	) bpts

P&LS net sales for the 2013 Third Quarter decreased by $59 million, or 9%, compared to the 2012 Third Quarter. Platform Solutions sales decreased by $71 million, which was partially offset by a sales increase of $12 million for Logistics Solutions. The Platform Solutions sales decrease was primarily for the Australia C-27J aircraft due to the timing of contract deliverables, U.S. Navy maritime patrol aircraft due to reduced funding caused by sequestration and reduced deliveries of aircraft cabin assemblies. The increase in Logistics Solutions was primarily due to increased volume for field maintenance and sustainment services for USAF training aircraft driven by a new competitively won contract.

P&LS operating income for the 2013 Third Quarter of $52 million decreased by $13 million, or 20%, compared to the 2012 Third Quarter. Operating margin decreased by 120 basis points to 8.8% primarily due to lower margin sales mix for Logistics Solutions.

P&LS net sales for the 2013 Year-to-Date Period decreased by $27 million, or 1%, compared to the 2012 Year-to-Date Period. Logistics Solutions sales decreased by $59 million, which was partially offset by a sales increase of $32 million for Platform Solutions. The decrease in Logistics Solutions was primarily due to the competitive loss of a task order for U.S. Army contract field team support services in Southwest Asia, which was completed in 2012, and reduced fleet management services due to the loss of the JPATS contract for the USAF. These decreases were partially offset by increased volume for field maintenance and sustainment services for USAF training aircraft. Platform Solutions sales increased primarily due to increased volume for USAF EC-130

44

and international head of state aircraft, and aircraft maintenance for the DND, partially offset by lower volume for the Joint Cargo Aircraft (JCA), Australia C-27J aircraft, and U.S. Navy maritime patrol aircraft, as well as reduced deliveries of aircraft cabin assemblies.

P&LS operating income for the 2013 Year-to-Date Period of $176 million decreased by $3 million, or 2%, compared to the 2012 Year-to-Date Period. Operating margin decreased by 10 basis points to 9.6% primarily due to the decrease in sales for Logistics Solutions.

NSS

	Third Quarter Ended						Increase/ (decrease)			Year-to-Date Ended						Increase/ (decrease)
	September 27, 2013			September 28, 2012						September 27, 2013			September 28, 2012
	(dollars in millions)
Net sales	$	323		$	353			(8.5	)%	$	985		$	1,038			(5.1	)%
Operating income	$	26		$	15			73.3	%	$	66		$	56			17.9	%
Operating margin		8.0	%		4.2	%		380	bpts		6.7	%		5.4	%		130	bpts

NSS net sales for the 2013 Third Quarter decreased by $30 million, or 8%, compared to the 2012 Third Quarter. The decrease in sales was primarily due to lower demand for a technical support contract for a U.S. Government agency due to sequestration budget reductions, and less demand for USSOCOM IT support services, as our previous single-award contract converted to several multiple-award contracts, which reduced our workshare.

NSS operating income for the 2013 Third Quarter of $26 million increased by $11 million, or 73%, compared to the 2012 Third Quarter. Operating margin increased by 380 basis points to 8.0%. Operating margin increased by: (1) 180 basis points due to 2012 Third Quarter charges of $4 million for an inventory write-down of security and safety equipment and legal fees of $2 million related to a supplier dispute that did not recur, (2) 170 basis points primarily due to lower operating costs, and (3) 30 basis points due to the timing of award fees for IT support services.

NSS net sales for the 2013 Year-to-Date Period decreased by $53 million, or 5%, compared to the 2012 Year-to-Date Period primarily due to reasons similar to the those discussed above for 2013 Third Quarter.

NSS operating income for the 2013 Year-to-Date Period of $66 million, which included severance charges of $1 million, increased by $10 million, or 18%, compared to the 2012 Year-to-Date Period. Operating margin increased by 130 basis points to 6.7%. Operating margin increased by: (1) 70 basis points due to 2012 Year-to-Date Period charges of $4 million for an inventory write-down of security and safety equipment and legal fees of $3 million related to a supplier dispute that did not recur, (2) 30 basis points for improved contract performance, and (3) 30 basis points primarily due to lower operating costs.

Liquidity and Capital Resources

Anticipated Sources and Uses of Cash Flow

At September 27, 2013, we had total cash and cash equivalents of $377 million as compared to $349 million at December 31, 2012. While no amounts of the cash and cash equivalents are considered restricted, $230 million was held by the Company’s foreign subsidiaries at September 27, 2013. The repatriation of cash held in non-U.S. jurisdictions is subject to local capital requirements, as well as income tax considerations. Our primary source of liquidity is cash flow generated from operations. We generated $617 million of cash from operating activities during the 2013 Year-to-Date Period. Significant cash used during the 2013 Year-to-Date Period included $404 million to repurchase shares of our common stock, $151 million paid for dividends and $147 million for capital expenditures.

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As of September 27, 2013, we had the availability of substantially all of our $1 billion Amended and Restated Revolving Credit Facility. Our Amended and Restated Revolving Credit Facility expires on February 3, 2017. We currently believe that our cash from operating activities, together with our cash on hand, and available borrowings under our Amended and Restated Revolving Credit Facility will be adequate for the foreseeable future to meet our anticipated requirements for working capital, capital expenditures, defined benefit plan contributions, commitments, contingencies, research and development expenditures, business acquisitions (depending on the size), program and other discretionary investments, interest payments, income tax payments, L-3 Holdings’ dividends and share repurchases.

Our business may not continue to generate cash flow at current levels, and it is possible that currently anticipated improvements may not be achieved. If we are unable to generate sufficient cash flow from operations to service our debt, we may be required to reduce costs and expenses, sell assets, reduce capital expenditures, reduce dividend payments, refinance all or a portion of our existing debt or obtain additional financing, which we may not be able to do on a timely basis, on satisfactory terms, or at all. Our ability to make scheduled principal payments or to pay interest on or to refinance our indebtedness depends on our future performance and financial results, which, to a certain extent, are subject to general conditions in or affecting the U.S. defense industry and to general economic, political, financial, competitive, legislative and regulatory factors beyond our control.

Balance Sheet

Billed receivables increased by $116 million to $1,084 million at September 27, 2013, from $968 million at December 31, 2012 primarily due to the timing of collections for ISR Systems and Logistics Solutions.

Contracts in process increased by $55 million to $2,691 million at September 27, 2013, from $2,636 million at December 31, 2012 due to an increase of $49 million in unbilled contracts receivables and $8 million in inventoried contract costs, partially offset by decreases of $2 million of foreign currency translation adjustments. The increase in unbilled contracts receivables is primarily due to sales exceeding billings for Logistics Solutions and Sensor Systems. The increase in inventoried contract costs is due to the timing of deliveries across several business areas, primarily Warrior Systems.

L-3’s receivables days sales outstanding (DSO) was 77 at September 27, 2013, compared with 71 at December 31, 2012 and 75 at September 28, 2012. The increase in DSO was primarily due to the increase in our net billed and unbilled contract receivables for the reasons discussed above. We calculate our DSO by dividing: (1) our aggregate end of period billed receivables and net unbilled contract receivables, by (2) our trailing 12 month sales adjusted, on a pro forma basis, to include sales from business acquisitions and exclude sales from business divestitures that we completed as of the end of the period, multiplied by the number of calendar days in the trailing 12 month period (364 days at September 27, 2013, 366 days at December 31, 2012 and 364 days at September 28, 2012). Our trailing 12 month pro forma sales were $12,932 million at September 27, 2013, $13,240 million at December 31, 2012 and $13,342 million at September 28, 2012.

Inventories increased by $57 million to $420 million at September 27, 2013, from $363 million at December 31, 2012 primarily due to higher inventory for Security & Detection and Warrior Systems to support customer demand and $2 million for foreign currency translation adjustments.

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Goodwill decreased by $19 million to $7,757 million at September 27, 2013 from $7,776 million at December 31, 2012. The table below presents the changes in goodwill by segment.

	C3ISR		Electronic Systems			P&LS			NSS		Consolidated Total
	(in millions)
Balance at December 31, 2012	$	797	$	4,836		$	1,175		$	968	$	7,776
Business dispositions		—		(2	)		—			—		(2	)
Foreign currency translation adjustments(1)		—		(7	)		(10	)		—		(17	)
Balance at September 27, 2013	$	797	$	4,827		$	1,165		$	968	$	7,757

⁽¹⁾  The decreases in goodwill presented in the Electronic Systems and P&LS segments were primarily due to the strengthening of the U.S. dollar against the Canadian dollar and Australian dollar, partially offset by the weakening of the U.S. dollar against the Euro during the year-to-date period ended September 27, 2013.

The decrease in identifiable intangible assets was primarily due to amortization expense.

The increase in other assets is primarily due to higher long-term receivables for leased training systems and higher capitalized software costs.

The fluctuations in accounts payable and accrued expenses were primarily due to the timing of when invoices for purchases from third party vendors and subcontractors were received and payments were made.

The decrease in advance payments and billings in excess of costs incurred was primarily due to the liquidation of balances on contracts for Platform Solutions, Sensor Systems, and Networked Communication Systems, and $2 million of foreign currency translation adjustments.

The decrease in pension and postretirement benefit plan liabilities was primarily due to cash contributions exceeding pension expense (excluding amortization of net losses) during the 2013 Year-to-Date Period. We expect to contribute cash of approximately $106 million to $145 million to our pension plans in 2013, of which $93 million was contributed during the 2013 Year-to-Date Period.

Non-current deferred income tax liabilities increased primarily due to amortization of certain goodwill and other identifiable intangible assets for tax purposes.

Statement of Cash Flows

2013 Year-to-Date Period Compared with 2012 Year-to-Date Period

The table below provides a summary of our cash flows from operating, investing, and financing activities for the periods indicated.

	Year-to-Date Ended
	September 27, 2013			September 28, 2012
	(in millions)
Net cash from operating activities from continuing operations	$	617		$	692
Net cash used in investing activities from continuing operations		(141	)		(137	)
Net cash used in financing activities from continuing operations		(446	)		(883	)

Operating Activities — Continuing Operations

We generated $617 million of cash from operating activities during the 2013 Year-to-Date Period, a decrease of $75 million compared with $692 million generated during the 2012 Year-to-Date Period. The decrease was due to: (1) $66 million of more cash used for changes in operating assets and liabilities primarily

47

due to advance payments and billings in excess of costs incurred, partially offset by lower pension plan contributions and income tax payments and (2) lower non-cash expenses of $24 million primarily due to lower contributions to employee savings plans in L-3 Holdings’ common stock. These decreases were partially offset by higher income from continuing operations of $15 million. See the discussion above under “Liquidity and Capital Resources — Balance Sheet” for additional information on changes in operating assets and liabilities.

Investing Activities — Continuing Operations

During the 2013 Year-to-Date Period, we used $141 million of cash, including $147 million for capital expenditures. These cash outflows were partially offset by proceeds of $10 million from dispositions of property, plant and equipment and $4 million from a business divesture. The 2012 Year-to-Date Period includes $349 million of cash used for the L-3 KEO, MAVCO, Inc. and Link U.K business acquisitions and $124 million for capital expenditures. Additionally, the 2012 Year-to-Date Period cash outflows were offset by $335 million of cash received from the spin-off of Engility.

Financing Activities — Continuing Operations

Debt

At September 27, 2013 total outstanding debt was $3,630 million, of which $2,941 million was senior debt and $689 million was CODES, compared to $3,629 million at December 31, 2012, of which $2,940 million was senior debt and $689 million was CODES. At September 27, 2013, there were no borrowings outstanding under our $1 billion Amended and Restated Revolving Credit Facility and we had substantially all of our $1 billion facility available for borrowings. We also had $568 million of outstanding standby letters of credit with financial institutions covering performance and financial guarantees per contractual requirements with certain customers, at September 27, 2013. These standby letters of credit may be drawn upon in the event that we do not perform on certain of our contractual requirements. At September 27, 2013, our outstanding debt matures between November 15, 2016 and August 1, 2035. See Note 9 to our unaudited condensed consolidated financial statements contained in this quarterly report for the components of our debt at September 27, 2013.

Debt Covenants and Other Provisions. The Amended and Restated Revolving Credit Facility and Senior Notes contain financial and/or other restrictive covenants. See Note 10 to our audited consolidated financial statements for the year ended December 31, 2012, included in our Annual Report on Form 10-K, for a description of our debt and related financial covenants and cross default provisions. As of September 27, 2013, we were in compliance with our financial and other restrictive covenants.

Under select conditions, including if L-3 Holdings’ common stock price is more than 120% (currently $108.29) of the then current conversion price (currently $90.24) for a specified period, the conversion feature of the CODES will require L-3 Holdings, upon conversion, to pay the holders of the CODES the principal amount in cash, and if the settlement amount exceeds the principal amount, the excess will be settled in cash or stock or a combination thereof, at our option. See Note 10 to our audited consolidated financial statements for the year ended December 31, 2012, included in our Annual Report on Form 10-K, for additional information regarding the CODES, including conditions for conversion. L-3 Holdings’ closing stock price on October 23, 2013 was $95.98 per share.

Guarantees. The borrowings under the Amended and Restated Revolving Credit Facility are fully and unconditionally guaranteed by L-3 Holdings and by substantially all of the material wholly-owned domestic subsidiaries of L-3 Communications on an unsecured senior basis. The payment of principal and premium, if any, and interest on the Senior Notes are fully and unconditionally guaranteed, on an unsecured senior basis, jointly and severally, by L-3 Communications’ material wholly-owned domestic subsidiaries that guarantee any of its other indebtedness. The payment of principal and premium, if any, and interest on the CODES are fully and unconditionally guaranteed, on an unsecured senior subordinated basis, jointly and severally, by L-3 Communications and its wholly-owned domestic subsidiaries that guarantee any of its other liabilities.

48

Subordination. The guarantees of the Amended and Restated Revolving Credit Facility and the Senior Notes rank senior to the guarantees of the CODES and rank pari passu with each other.

Equity

Repurchases of L-3 Holdings’ common stock, under the share repurchase programs approved by the Board of Directors, are made from time to time at management’s discretion in accordance with applicable U.S. Federal securities laws in the open market or otherwise. The timing and actual number of shares to be repurchased in the future will depend on a variety of factors, including the Company’s financial position, earnings, legal requirements, other investment opportunities (including acquisitions), market conditions and other factors. All share repurchases of L-3 Holdings’ common stock have been recorded as treasury shares.

The table below presents our repurchases of L-3 Holdings’ common stock during the 2013 Year-to-Date Period.

	Total Number of Shares Purchased		Average Price Paid Per Share		Treasury Stock
					(at cost in millions)
January 1 — March 29, 2013		1,571,672	$	77.30	$	122
March 30 — June 28, 2013		1,512,201	$	83.59	$	126
June 29 — September 27, 2013		1,692,160	$	92.25	$	156

Of the $404 million of aggregate share repurchases made by L-3 Holdings in the 2013 Year-to-Date Period, $168 million were made under the $1.5 billion share repurchase program approved by L-3 Holdings’ Board of Directors on April 26, 2011. The April 26, 2011 share repurchase program expired on April 30, 2013. The remaining $236 million of share repurchases were made under the $1.5 billion share repurchase program approved by L-3 Holdings’ Board of Directors on February 5, 2013, which had a remaining dollar value of authorization of $1,264 million at September 27, 2013. From September 28, 2013 through October 23, 2013, L-3 Holdings repurchased 527,135 shares of its common stock at an average price of $93.88 per share for an aggregate amount of $49 million under the February 5, 2013 share repurchase program.

During the 2013 Year-to-Date Period, L-3 Holdings’ Board of Directors authorized the quarterly cash dividends in the table below.

Date Declared	Record Date		Cash Dividend Per Share		Date Paid		Total Dividends Paid
							(in millions)
February 5, 2013		March 1, 2013	$	0.55		March 15, 2013	$	50
April 30, 2013		May 17, 2013	$	0.55		June 17, 2013	$	49
June 19, 2013		August 19, 2013	$	0.55		September 16, 2013	$	50

In addition to the dividends in the table above, the Company paid $2 million of previously accrued dividends for employee held stock-awards during the 2013 Year-to-Date Period.

On October 22, 2013, L-3 Holdings’ Board of Directors declared a quarterly cash dividend of $0.55 per share, payable on December 16, 2013, to shareholders of record at the close of business on November 18, 2013.

Legal Proceedings and Contingencies

For a discussion of legal proceedings and contingencies that could impact our results of operations, financial condition or cash flows, see Note 17 to our unaudited condensed consolidated financial statements contained in this quarterly report.

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Forward-Looking Statements

Certain of the matters discussed in this report, including information regarding the Company’s 2013 financial outlook, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than historical facts, may be forward-looking statements, such as “may,” “will,” “should,” “likely,” “projects,” ‘‘expects,’’ ‘‘anticipates,’’ ‘‘intends,’’ ‘‘plans,’’ ‘‘believes,’’ ‘‘estimates,’’ and similar expressions are used to identify forward-looking statements. The Company cautions investors that these statements are subject to risks and uncertainties many of which are difficult to predict and generally beyond the Company’s control that could cause actual results to differ materially from those expressed in, or implied or projected by, the forward-looking information and statements. Some of the factors that could cause actual results to differ include, but are not limited to, the following: our dependence on the defense industry; backlog processing and program slips resulting from delayed funding of the Department of Defense (DoD) budget; the outcome of sequestration cuts to the defense budget and the apportionment of available funding between programs; future U.S. Government shutdowns or failure to raise the debt ceiling; our reliance on contracts with a limited number of customers and the possibility of termination of government contracts by unilateral government action or for failure to perform; the extensive legal and regulatory requirements surrounding many of our contracts; our ability to retain our existing business and related contracts; our ability to successfully compete for and win new business; or, identify, acquire and integrate additional businesses; our ability to maintain and improve our operating margin; the availability of government funding and changes in customer requirements for our products and services; our significant amount of debt and the restrictions contained in our debt agreements; our ability to continue to recruit, retain and train our employees; actual future interest rates, volatility and other assumptions used in the determination of pension benefits and equity based compensation, as well as the market performance of benefit plan assets; our collective bargaining agreements, our ability to successfully negotiate contracts with labor unions and our ability to favorably resolve labor disputes should they arise; the business, economic and political conditions in the markets in which we operate; global economic uncertainty; the DoD’s in-sourcing and efficiency initiatives; events beyond our control such as acts of terrorism; our ability to perform contracts on schedule; our international operations; our extensive use of fixed-price type contracts; the rapid change of technology and high level of competition in which our businesses participate; our introduction of new products into commercial markets or our investments in civil and commercial products or companies; the outcome of litigation matters; results of audits by U.S. Government agencies and of on-going governmental investigations; the impact on our business of improper conduct by our employees, agents or business partners; ultimate resolution of contingent matters, claims and investigations relating to acquired businesses, and the impact on the final purchase price allocations; and the fair values of our assets.

Our forward-looking statements speak only as of the date of this report or as of the date they were made, and we undertake no obligation to update forward-looking statements. For a more detailed discussion of these factors, also see the information under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our most recent annual report on Form 10-K for the year ended December 31, 2012 and in this quarterly report on Form 10-Q, and any material updates to these factors contained in any of our future filings.

As for the forward-looking statements that relate to future financial results and other projections, actual results will be different due to the inherent uncertainties of estimates, forecasts and projections and may be better or worse than projected and such differences could be material. Given these uncertainties, you should not place any reliance on these forward-looking statements.

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ITEM 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

See Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Derivative Financial Instruments and Other Market Risks,” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2012 for a discussion of our exposure to market risks. There were no material changes to our disclosure about market risks during the 2013 Year-to-Date Period. See Notes 15 and 16 to our unaudited condensed consolidated financial statements contained in this quarterly report for the aggregate fair values and notional amounts of our foreign currency forward contracts at September 27, 2013.

ITEM 4.

CONTROLS AND PROCEDURES

Conclusions Regarding Effectiveness of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in our reports under the Securities Exchange Act of 1934 related to L-3 Holdings and L-3 Communications is recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms, and that such information is accumulated and communicated to our management, including our Chairman, President and Chief Executive Officer, and our Senior Vice President and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosures. Any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. Our management, with the participation of our Chairman, President and Chief Executive Officer, and our Senior Vice President and Chief Financial Officer, has evaluated the effectiveness of the design and operation of our disclosure controls and procedures as of September 27, 2013. Based upon that evaluation, our Chairman, President and Chief Executive Officer, and our Senior Vice President and Chief Financial Officer concluded that, as of September 27, 2013, the design and operation of our disclosure controls and procedures were effective to accomplish their objectives at the reasonable assurance level.

There were no changes in our internal control over financial reporting that occurred during the quarter ended September 27, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II — OTHER INFORMATION

ITEM 1.

LEGAL PROCEEDINGS

The information required with respect to this item can be found in Note 17 to our unaudited condensed consolidated financial statements contained in this quarterly report and is incorporated by reference into this Item 1.

ITEM 1A.

RISK FACTORS

In addition to the other information set forth in this report, you should carefully consider the factors discussed in Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2012, and “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Overview and Outlook — Business Environment”, which could materially affect our business, financial condition or future results. Other than as described in “Business Environment”, there have been no material changes to the risk factors disclosed in Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2012. The risks described in our Annual Report on Form 10-K are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

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ITEM 2.

UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Issuer Purchases of Equity Securities

The following table provides information about share repurchases made by L-3 Holdings of its common stock during the 2013 Third Quarter. Repurchases are made from time to time at management’s discretion in accordance with applicable U.S. Federal securities laws. All share repurchases of L-3 Holdings’ common stock have been recorded as treasury shares.

	Total Number of Shares Purchased		Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Number (or Approximate Dollar Value) of Shares That May Yet be Purchased Under the Plans or Programs(1)
							(in millions)
June 29 — July 31, 2013		247,968	$	88.61		247,968	$	1,398
August 1 — August 31, 2013		639,727	$	92.44		639,727	$	1,339
September 1 — September 27, 2013		804,465	$	93.21		804,465	$	1,264
Total		1,692,160	$	92.25		1,692,160

⁽¹⁾  The share repurchases that were completed as described in the table above were made pursuant to the $1.5 billion share repurchase program authorized by L-3 Holdings’ Board of Directors on February 5, 2013, which had a remaining dollar value of authorization of $1,264 million at September 27, 2013 and expires on June 30, 2015.

ITEM 6.

EXHIBITS

For a list of exhibits, see the Exhibit Index in this Form 10-Q.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrants have duly caused this report to be signed on their behalf by the undersigned, thereunto duly authorized.

L-3 COMMUNICATIONS HOLDINGS, INC.
L-3 COMMUNICATIONS CORPORATION
By:	/s/    Ralph G. D’Ambrosio
Title:	Senior Vice President and Chief Financial Officer
	(Principal Financial Officer)

Date: October 29, 2013

54

EXHIBIT INDEX

Exhibits identified in parentheses below are on file with the SEC and are incorporated herein by reference to such previous filings.

Exhibit No.	Description of Exhibits
2.1	Distribution Agreement between L-3 Communications Holdings, Inc. and Engility Holdings, Inc. dated as of July 16, 2012 (incorporated by reference to Exhibit 2.1 to the Registrants’ Quarterly Report on Form 10-Q for the period ended September 28, 2012 (File Nos. 001-14141 and 333-46983)).
3.1	Amended and Restated Certificate of Incorporation of L-3 Communications Holdings, Inc. (incorporated by reference to Exhibit 3.1 to the Registrants’ Current Report on Form 8-K filed on May 2, 2013 (File Nos. 001-14141 and 333-46983)).
3.2	Amended and Restated By-Laws of L-3 Communications Holdings, Inc. (incorporated by reference to Exhibit 3.2 to the Registrants’ Current Report on Form 8-K filed on May 2, 2013 (File Nos. 001-14141 and 333-46983)).
3.3	Certificate of Incorporation of L-3 Communications Corporation (incorporated by reference to Exhibit 3.1 to L-3 Communications Corporation’s Registration Statement on Form S-4 (File No. 333-31649)).
3.4	Amended and Restated Bylaws of L-3 Communications Corporation (incorporated by reference to Exhibit 3.2 to the Registrants’ Current Report on Form 8-K filed on December 17, 2007 (File Nos. 001-14141 and 333-46983)).
4.1	Form of Common Stock Certificate of L-3 Communications Holdings, Inc. (incorporated by reference to Exhibit 4.1 to the Registrants’ Quarterly Report on Form 10-Q for the quarter ended June 25, 2010 (File Nos. 001-14141 and 333-46983)).
4.2	Indenture dated as of July 29, 2005 (CODES Indenture) among L-3 Communications Holdings, Inc., the guarantors named therein and The Bank of New York Mellon (formerly known as The Bank of New York), as Trustee (incorporated by reference to Exhibit 10.70 to the Registrants’ Quarterly Report on Form 10-Q for the quarter ended June 30, 2005 (File Nos. 001-14141 and 333-46983)).
4.3	Supplemental Indenture dated as of February 3, 2012 among L-3 Communications Holdings, Inc., The Bank of New York Mellon (formerly known as The Bank of New York), as trustee, and the guarantors named therein to the CODES Indenture dated as of July 29, 2005 among L-3 Communications Holdings, Inc., the guarantors named therein and The Bank of New York Mellon, as trustee (incorporated by reference to Exhibit 4.5 to the Registrants’ Annual Report on Form 10-K for the year ended December 31, 2011 (File Nos. 001-14141 and 333-46983)).
4.4	Indenture dated as of October 2, 2009 among L-3 Communications Corporation, the guarantors named therein and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.15 to the Registrants’ Quarterly Report on Form 10-Q for the quarter ended September 25, 2009 (File Nos. 001-14141 and 333-46983)).
4.5	Supplemental Indenture dated as of February 3, 2012 among L-3 Communications Corporation, The Bank of New York Mellon, as trustee, and the guarantors named therein to the Indenture dated as of October 2, 2009 among L-3 Communications Corporation, the guarantors named therein and The Bank of New York Mellon, as trustee (incorporated by reference to Exhibit 4.7 to the Registrants’ Annual Report on Form 10-K for the year ended December 31, 2011 (File Nos. 001-14141 and 333-46983)).

Exhibit No.	Description of Exhibits
4.6	Indenture, dated as of May 21, 2010, among L-3 Communications Corporation, the guarantors named therein and The Bank of New York Mellon Trust Company, N.A., as Trustee (incorporated by reference to Exhibit 4.1 to the Registrants’ Current Report on Form 8-K dated May 24, 2010 (File Nos. 001-14141 and 333-46983)).
4.7	First Supplemental Indenture, dated as of May 21, 2010, among L-3 Communications Corporation, the guarantors named therein and The Bank of New York Mellon Trust Company, N.A., as Trustee (incorporated by reference to Exhibit 4.2 to the Registrants’ Current Report on Form 8-K dated May 24, 2010 (File Nos. 001-14141 and 333-46983)).
4.8	Second Supplemental Indenture, dated as of February 7, 2011, among L-3 Communications Corporation, the guarantors named therein and The Bank of New York Mellon Trust Company, N.A., as Trustee (incorporated by reference to Exhibit 4.2 to the Registrants’ Current Report on Form 8-K dated February 8, 2011 (File Nos. 001-14141 and 333-46983)).
4.9	Third Supplemental Indenture, dated as of November 22, 2011, among L-3 Communications Corporation, the guarantors named therein and The Bank of New York Mellon Trust Company, N.A, as Trustee (incorporated by reference to Exhibit 4.2 to the Registrants’ Current Report on Form 8-K dated November 22, 2011 (File Nos. 001-14141 and 333-46983)).
4.10	Fourth Supplemental Indenture, dated as of February 3, 2012, among L-3 Communications Corporation, the guarantors named therein and The Bank of New York Mellon Trust Company, N.A, as Trustee (incorporated by reference to Exhibit 4.12 to the Registrants’ Annual Report on Form 10-K for the fiscal year ended December 31, 2011 (File Nos. 001-14141 and 333-46983)).
10.1	Amended and Restated Credit Agreement, dated as of February 3, 2012, among L-3 Communications Corporation, L-3 Communications Holdings, Inc. and certain subsidiaries of the Registrants from time to time party thereto as guarantors, certain lenders from time to time party thereto, and Bank of America, N.A., as administrative agent (incorporated by reference to Exhibit 10.1 to the Registrants’ Current Report on Form 8-K dated February 3, 2012 (File Nos. 001-14141 and 333-46983)).
10.2	Tax Matters Agreement between L-3 Communications Holdings, Inc. and Engility Holdings, Inc. dated as of July 16, 2012 (incorporated by reference to Exhibit 10.2 to the Registrants’ Quarterly Report on Form 10-Q for the period ended September 28, 2012 (File Nos. 001-14141 and 333-46983)).
**11	L-3 Communications Holdings, Inc. Computation of Basic Earnings Per Share and Diluted Earnings Per Common Share.
*12	Ratio of Earnings to Fixed Charges.
*31.1	Certification of Chairman, President and Chief Executive Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended.
*31.2	Certification of Senior Vice President and Chief Financial Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended.
*32	Section 1350 Certification.
***101.INS	XBRL Instance Document.
***101.SCH	XBRL Taxonomy Extension Schema Document.
***101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
***101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
***101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
***101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

* Filed herewith.

** The information required in this exhibit is presented in Note 13 to the unaudited condensed consolidated financial statements as of September 27, 2013 contained in this quarterly report in accordance with the provisions of ASC 260, Earnings Per Share.

*** Filed electronically with this report.

EX-12

Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges

	Year-to-Date Ended September 27, 2013
	($ in millions)
Earnings:
Income before income taxes	$	814
Less: Net income attributable to noncontrolling interests		(6	)
Income before income taxes after noncontrolling interests	$	808
Add:
Interest expense		127
Amortization of debt expense		4
Interest component of rent expense		29
Earnings	$	968
Fixed charges:
Interest expense		127
Amortization of debt expense		4
Interest component of rent expense		29
Fixed charges	$	160
Ratio of earnings to fixed charges		6.1	x

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Michael T. Strianese, certify that:

1. I have reviewed this report on Form 10-Q for the quarter ended September 27, 2013 of L-3 Communications Holdings, Inc. and L-3 Communications Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrants as of, and for, the periods presented in this report;

4. The registrants’ other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrants and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrants, including their consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrants’ disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrants’ internal control over financial reporting that occurred during the registrants’ most recent fiscal quarter (the registrants’ fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrants’ internal control over financial reporting; and

5. The registrants’ other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants’ auditors and the audit committee of the registrants’ board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting, which are reasonably likely to adversely affect the registrants’ ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants’ internal control over financial reporting.

Date: October 29, 2013

/s/ Michael T. Strianese

Michael T. Strianese

Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Ralph G. D’Ambrosio, certify that:

1. I have reviewed this report on Form 10-Q for the quarter ended September 27, 2013 of L-3 Communications Holdings, Inc. and L-3 Communications Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrants as of, and for, the periods presented in this report;

4. The registrants’ other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrants and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrants, including their consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrants’ disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrants’ internal control over financial reporting that occurred during the registrants’ most recent fiscal quarter (the registrants’ fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrants’ internal control over financial reporting; and

5. The registrants’ other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants’ auditors and the audit committee of the registrants’ board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting, which are reasonably likely to adversely affect the registrants’ ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants’ internal control over financial reporting.

Date: October 29, 2013

/s/ Ralph G. D’Ambrosio

Ralph G. D’Ambrosio

Senior Vice President and Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of L-3 Communications Holdings, Inc. (“L-3 Holdings”) and L-3 Communications Corporation (“L-3 Communications”; together with L-3 Holdings referred to as “L-3”) on Form 10-Q for the quarter ended September 27, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Michael T. Strianese, Chairman, President and Chief Executive Officer and Ralph G. D’Ambrosio, Senior Vice President and Chief Financial Officer, in each case, of L-3 Holdings and L-3 Communications, each certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of L-3.

Date: October 29, 2013

/s/ Michael T. Strianese	/s/ Ralph G. D’Ambrosio
Michael T. Strianese	Ralph G. D’Ambrosio
Chairman, President and Chief Executive Officer	Senior Vice President and Chief Financial Officer

XML

Employee Stock-Based Compensation - Weighted Average Assumptions in Valuation Model (Detail)	1 Months Ended
	Feb. 20, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected holding period (in years)	5 years 7 months 6 days
Expected volatility	26.40%
Expected dividend yield	3.60%
Risk-free interest rate	1.00%

XML

L-3 Holdings' Earnings Per Common Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share	3.2	1.2	3.5

XML

Financial Instruments - Carrying Amounts and Estimated Fair Values of Company's Long-Term Debt and Foreign Currency Forward Contracts (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Fair Value Of Other Financial Instrument [Line Items]
Senior Notes, Carrying Amount	$ 2,941	$ 2,940
CODES, Carrying Amount	689	689
Senior Notes, Estimated Fair Value	3,131	3,301
CODES, Estimated Fair Value	752	697
Carrying Amount [Member]
Fair Value Of Other Financial Instrument [Line Items]
Foreign currency forward contracts	6	5
Estimated Fair Value [Member]
Fair Value Of Other Financial Instrument [Line Items]
Foreign currency forward contracts	$ 6	$ 5

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Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries - Condensed Combining Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012	Sep. 28, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 377	$ 349	$ 514	$ 764
Billed receivables, net	1,084	968
Contracts in process	2,691	2,636
Other current assets	645	602
Total current assets	4,797	4,555
Goodwill	7,757	7,776
Other assets	1,521	1,510
Investment in and amounts due from consolidated subsidiaries
Total assets	14,075	13,841
Current liabilities	2,503	2,591
Amounts due to consolidated subsidiaries
Other long-term liabilities	2,112	2,078
Long-term debt	3,630	3,629
Total liabilities	8,245	8,298
L-3 shareholders' equity	5,755	5,467
Noncontrolling interests	75	76
Total equity	5,830	5,543	5,842	6,724
Total liabilities and equity	14,075	13,841
L-3 Communications Holdings, Inc. [Member]
Current assets:
Cash and cash equivalents
Billed receivables, net
Contracts in process
Other current assets
Total current assets
Goodwill
Other assets
Investment in and amounts due from consolidated subsidiaries	6,444	6,156
Total assets	6,444	6,156
Current liabilities
Amounts due to consolidated subsidiaries
Other long-term liabilities
Long-term debt	689	689
Total liabilities	689	689
L-3 shareholders' equity	5,755	5,467
Noncontrolling interests
Total equity	5,755	5,467
Total liabilities and equity	6,444	6,156
L-3 Communications Corporation's [Member]
Current assets:
Cash and cash equivalents	154	246	361	644
Billed receivables, net	381	290
Contracts in process	1,053	945
Other current assets	291	248
Total current assets	1,879	1,729
Goodwill	2,290	1,993
Other assets	797	734
Investment in and amounts due from consolidated subsidiaries	7,075	7,208
Total assets	12,041	11,664
Current liabilities	852	823
Amounts due to consolidated subsidiaries
Other long-term liabilities	1,804	1,745
Long-term debt	3,630	3,629
Total liabilities	6,286	6,197
L-3 shareholders' equity	5,755	5,467
Noncontrolling interests
Total equity	5,755	5,467
Total liabilities and equity	12,041	11,664
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	1		1
Billed receivables, net	480	441
Contracts in process	1,260	1,351
Other current assets	149	163
Total current assets	1,890	1,955
Goodwill	4,285	4,586
Other assets	517	565
Investment in and amounts due from consolidated subsidiaries	3,584	3,326
Total assets	10,276	10,432
Current liabilities	1,038	1,255
Amounts due to consolidated subsidiaries
Other long-term liabilities	193	210
Long-term debt
Total liabilities	1,231	1,465
L-3 shareholders' equity	9,045	8,967
Noncontrolling interests
Total equity	9,045	8,967
Total liabilities and equity	10,276	10,432
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	244	242	217	222
Billed receivables, net	223	237
Contracts in process	378	340
Other current assets	205	191
Total current assets	1,050	1,010
Goodwill	1,182	1,197
Other assets	207	211
Investment in and amounts due from consolidated subsidiaries		43
Total assets	2,439	2,461
Current liabilities	635	652
Amounts due to consolidated subsidiaries	310
Other long-term liabilities	115	123
Long-term debt
Total liabilities	1,060	775
L-3 shareholders' equity	1,379	1,686
Noncontrolling interests
Total equity	1,379	1,686
Total liabilities and equity	2,439	2,461
Eliminations [Member]
Current assets:
Cash and cash equivalents	(22)	(139)	(65)	(102)
Billed receivables, net
Contracts in process
Other current assets
Total current assets	(22)	(139)
Goodwill
Other assets
Investment in and amounts due from consolidated subsidiaries	(17,103)	(16,733)
Total assets	(17,125)	(16,872)
Current liabilities	(22)	(139)
Amounts due to consolidated subsidiaries	(310)
Other long-term liabilities
Long-term debt	(689)	(689)
Total liabilities	(1,021)	(828)
L-3 shareholders' equity	(16,179)	(16,120)
Noncontrolling interests	75	76
Total equity	(16,104)	(16,044)
Total liabilities and equity	$ (17,125)	$ (16,872)

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Other Current Liabilities and Other Liabilities

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Other Current Liabilities and Other Liabilities

8.  Other Current Liabilities and Other Liabilities

The table below presents the components of other current liabilities.

	September 27, 2013		December 31, 2012
	(in millions)
Other Current Liabilities:
Accruals for pending and threatened litigation (see Note 17)	$	5	$	7
Accrued product warranty costs		76		78
Estimated costs in excess of estimated contract value to complete contracts in process in a loss position		67		72
Accrued interest		46		53
Deferred revenues		38		37
Estimated contingent purchase price payable for acquired businesses		—		4
Other		151		144
Total other current liabilities	$	383	$	395

The table below presents the components of other liabilities.

	September 27, 2013		December 31, 2012
	(in millions)
Other Liabilities:
Non-current income taxes payable (see Note 10)	$	145	$	137
Accrued workers’ compensation		53		57
Deferred compensation		45		43
Accrued product warranty costs		24		22
Notes payable and capital lease obligations		17		24
Estimated contingent purchase price payable for acquired businesses		—		5
Other		73		102
Total other liabilities	$	357	$	390

The table below presents the changes in the Company’s accrued product warranty costs.

	Year-to-Date Ended
	September 27, 2013			September 28, 2012
	(in millions)
Accrued product warranty costs:(1)
Balance at January 1	$	100		$	94
Acquisitions during the period		—			2
Accruals for product warranties issued during the period		56			56
Settlements made during the period		(56	)		(58	)
Balance at end of period	$	100		$	94

⁽¹⁾  Warranty obligations incurred in connection with long-term production contracts that are accounted for under the POC cost-to-cost method are included within the contract estimates at completion and are excluded from the above amounts. The balances above include both the current and non-current amounts.

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Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Dec. 31, 2012
Basis Of Presentation And Significant Accounting Policies [Line Items]
Percentage of sales accounted for under contract accounting standards			48.00%
Percentage of fixed-price type contracts			39.00%
Percentage of cost-plus type contracts			9.00%
Period of performance for contracts accounted for under the percentage-of-completion method of accounting, minimum	1 year
Increase in consolidated operating income due to changes in contract estimates	$ 85	$ 75
Percentage of increase in consolidated operating income due to changes in contract estimates	9.10%	7.60%
CODES Due 2035 [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Interest rate on debt instruments	3.00%
Debt instruments, maturity year	2035

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Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Net sales:
Products	$ 1,696	$ 1,915	$ 5,319	$ 5,452
Services	1,300	1,368	4,054	4,134
Total net sales	2,996	3,283	9,373	9,586
Cost of sales:
Products	(1,486)	(1,717)	(4,729)	(4,837)
Services	(1,196)	(1,235)	(3,710)	(3,762)
Total cost of sales	(2,682)	(2,952)	(8,439)	(8,599)
Operating income	314	331	934	987
Interest expense	(44)	(48)	(131)	(138)
Interest and other income, net	3		11	6
Debt retirement charge		(8)		(8)
Income from continuing operations before income taxes	273	275	814	847
Provision for income taxes	(65)	(80)	(226)	(274)
Income from continuing operations	208	195	588	573
Income (Loss) from discontinued operations, net of income taxes		(1)		32
Net income	208	194	588	605
Net income attributable to noncontrolling interests	(4)	(2)	(6)	(7)
Net income attributable to L-3	$ 204	$ 192	$ 582	$ 598
Basic earnings (loss) per share attributable to L-3 Holdings' common shareholders:
Continuing operations	$ 2.28	$ 2.01	$ 6.47	$ 5.85
Discontinued operations		$ (0.01)		$ 0.29
Basic earnings per share	$ 2.28	$ 2.00	$ 6.47	$ 6.14
Diluted earnings (loss) per share attributable to L-3 Holdings' common shareholders:
Continuing operations	$ 2.23	$ 1.98	$ 6.37	$ 5.78
Discontinued operations		$ (0.01)		$ 0.28
Diluted earnings per share	$ 2.23	$ 1.97	$ 6.37	$ 6.06
Cash dividends paid per common share	$ 0.55	$ 0.50	$ 1.65	$ 1.50
L-3 Holdings' weighted average common shares outstanding:
Basic	89.6	96.1	89.9	97.4
Diluted	91.3	97.4	91.3	98.7

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Description of Business

9 Months Ended

Sep. 27, 2013

Accounting Policies [Abstract]

Description of Business

1.  Description of Business

L-3 Communications Holdings, Inc. derives all of its operating income and cash flows from its wholly-owned subsidiary, L-3 Communications Corporation (L-3 Communications). L-3 Communications Holdings, Inc. (L-3 Holdings and, together with its subsidiaries, referred to herein as L-3 or the Company) is a prime contractor in Intelligence, Surveillance and Reconnaissance (ISR) systems, Command, Control, Communications (C³) systems, platform and logistics solutions for aircrafts, maritime vessels and ground vehicles, and national security solutions. L-3 is also a leading provider of a broad range of electronic systems used on military and commercial platforms. The Company’s customers include the United States (U.S.) Department of Defense (DoD) and its prime contractors, U.S. Government intelligence agencies, the U.S. Department of Homeland Security (DHS), U.S. Department of State (DoS), allied international governments, and domestic and international commercial customers.

The Company has the following four reportable segments: (1) C³ISR, (2) Electronic Systems, (3) Platform & Logistics Solutions (P&LS) and (4) National Security Solutions (NSS). Financial information with respect to each of the Company’s segments is included in Note 21. C³ISR provides products and services for the global ISR market, C³ systems, networked communication systems and secure communications products. The Company believes that these products and services are critical elements for a substantial number of major command, control and communication, intelligence gathering and space systems. These products and services are used to connect a variety of airborne, space, ground and sea-based communication systems and are used in the transmission, processing, recording, monitoring, and dissemination functions of these communication systems. Electronic Systems provides a broad range of products and services, including components, products, subsystems and systems and related services to military and commercial customers in several niche markets across several business areas. These business areas include microwave, power & control systems, marine systems international, sensor systems, simulation & training, aviation products, precision engagement, warrior systems, security & detection, space & propulsion, undersea warfare and marine services. P&LS provides modernization, upgrades and sustainment, maintenance and logistics support solutions for military and various government aircraft and other platforms. The Company sells these services primarily to the DoD, the Canadian Department of National Defence and other allied international governments. NSS provides a full range of cyber security, intelligence, enterprise information technology (IT) and security solutions services to the DoD, U.S. Government intelligence agencies, federal civilian agencies and allied international governments.

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Financial Instruments

9 Months Ended

Sep. 27, 2013

Investments All Other Investments [Abstract]

Financial Instruments

15.  Financial Instruments

At September 27, 2013 and December 31, 2012, the Company’s financial instruments consisted primarily of cash and cash equivalents, billed receivables, trade accounts payable, Senior Notes, CODES and foreign currency forward contracts. The carrying amounts of cash and cash equivalents, billed receivables and trade accounts payable are representative of their respective fair values because of their short-term maturities or the expected settlement dates of these instruments. The carrying amounts and estimated fair values of the Company’s financial instruments are presented in the table below.

	September 27, 2013				December 31, 2012
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
	(in millions)
Senior Notes(1)	$	2,941	$	3,131	$	2,940	$	3,301
CODES(1)		689		752		689		697
Foreign currency forward contracts(2)		6		6		5		5

⁽¹⁾  The Company measures the fair value of its Senior Notes and CODES using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market.

⁽²⁾  See Note 16 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts.

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Other Current Liabilities and Other Liabilities - Other Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Other Liabilities:
Non-current income taxes payable (see Note 10)	$ 145	$ 137
Accrued workers' compensation	53	57
Deferred compensation	45	43
Accrued product warranty costs	24	22
Notes payable and capital lease obligations	17	24
Estimated contingent purchase price payable for acquired businesses		5
Other	73	102
Total other liabilities	$ 357	$ 390

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Dispositions and Acquisitions - Unaudited Pro Forma Statements of Operations Data (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 28, 2012	Sep. 28, 2012
Business Combinations [Abstract]
Pro forma net sales	$ 3,295	$ 9,688
Pro forma income from continuing operations	195	574
Pro forma net income attributable to L-3	$ 192	$ 599
Pro forma diluted earnings per share from continuing operations	$ 1.98	$ 5.79
Pro forma diluted earnings per share	$ 1.97	$ 6.07

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Debt

9 Months Ended

Sep. 27, 2013

Debt Disclosure [Abstract]

Debt

9.  Debt

The components of debt and a reconciliation to the carrying amount of long-term debt is presented in the table below.

	September 27, 2013			December 31, 2012
	(in millions)
L-3 Communications:
Borrowings under Amended and Restated Revolving Credit Facility(1)	$	—		$	—
3.95% Senior Notes due 2016		500			500
5.20% Senior Notes due 2019		1,000			1,000
4.75% Senior Notes due 2020		800			800
4.95% Senior Notes due 2021		650			650
Subtotal		2,950			2,950
L-3 Holdings:
3% Convertible Contingent Debt Securities due 2035(2)		689			689
Principal amount of long-term debt		3,639			3,639
Unamortized discounts		(9	)		(10	)
Carrying amount of long-term debt	$	3,630		$	3,629

⁽¹⁾  During the year-to-date period ended September 27, 2013, L-3 Communications’ aggregate borrowings and repayments under the Amended and Restated Revolving Credit Facility was $1,382 million. At September 27, 2013, L-3 Communications had the availability of substantially all of its $1 billion Amended and Restated Revolving Credit Facility, which expires on February 3, 2017.

⁽²⁾  Under select conditions, including if L-3 Holdings’ common stock price is more than 120% (currently $108.29) of the then current conversion price (currently $90.24) for a specified period, the conversion feature of the CODES will require L-3 Holdings, upon conversion, to pay the holders of the CODES the principal amount in cash, and if the settlement amount exceeds the principal amount, the excess will be settled in cash or stock or a combination thereof, at the Company’s option. At the current conversion price of $90.24, the aggregate consideration to be delivered upon conversion would be determined based on 7.6 million shares of L-3 Holdings’ common stock. See Note 10 to the audited consolidated financial statements for the year ended December 31, 2012, included in the Company’s Annual Report on Form 10-K, for additional information regarding the CODES, including conditions for conversion. L-3 Holdings’ closing stock price on October 23, 2013 was $95.98 share. Interest expense recognized was $5 million for both quarterly periods ended September 27, 2013 and September 28, 2012 and $15 million for both year-to-date periods ended September 27, 2013 and September 28, 2012. A portion of this interest expense was allocated to discontinued operations for the quarterly and year-to-date periods ended September 28, 2012 as a result of the spin-off of Engility. The carrying amount of the equity component (conversion feature) of the CODES was $64 million at September 27, 2013 and December 31, 2012.

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Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012
Additional Cash Flow Elements And Supplemental Cash Flow Information [Abstract]
Interest paid on outstanding debt	$ 133	$ 152
Income tax payments	168	248
Income tax refunds	$ 20	$ 18

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Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 27, 2013

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Year-to-Date Ended
	September 27, 2013		September 28, 2012
	(in millions)
Interest paid on outstanding debt	$	133	$	152
Income tax payments		168		248
Income tax refunds		20		18

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Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Derivative [Line Items]
Estimated amount of existing losses expected to be reclassified into income within the next 12 months	$ (3)
CODES Due 2035 [Member]
Derivative [Line Items]
Fair value of embedded derivative related to the issuance of the CODES	$ 0	$ 0

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Contracts in Process - Components of Contracts in Process (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Components of contracts in process
Unbilled contract receivables, gross	$ 2,714	$ 2,879
Unliquidated progress payments	(1,051)	(1,265)
Unbilled contract receivables, net	1,663	1,614
Inventoried contract costs, gross	1,093	1,090
Unliquidated progress payments	(65)	(68)
Inventoried contract costs, net	1,028	1,022
Total contracts in process	$ 2,691	$ 2,636

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Goodwill and Identifiable Intangible Assets (Tables)

9 Months Ended

Sep. 27, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill by Segment

The table below presents the changes in goodwill by segment for the year-to-date period ended September 27, 2013.

	C3ISR		Electronic Systems			P&LS			NSS		Consolidated Total
	(in millions)
Balance at December 31, 2012	$	797	$	4,836		$	1,175		$	968	$	7,776
Business dispositions		—		(2	)		—			—		(2	)
Foreign currency translation adjustments(1)		—		(7	)		(10	)		—		(17	)
Balance at September 27, 2013	$	797	$	4,827		$	1,165		$	968	$	7,757

⁽¹⁾  The decreases in goodwill presented in the Electronic Systems and P&LS segments were primarily due to the strengthening of the U.S. dollar against the Canadian dollar and Australian dollar, partially offset by the weakening of the U.S. dollar against the Euro during the year-to-date period ended September 27, 2013.

Identifiable Intangible Assets

Identifiable Intangible Assets. Information on the Company’s identifiable intangible assets that are subject to amortization is presented in the table below.

	September 27, 2013							December 31, 2012
	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in years)	(in millions)
Customer contractual relationships	19	$	461	$	246	$	215	$	460	$	225	$	235
Technology	11		164		105		59		164		98		66
Other	17		27		15		12		27		14		13
Total	17	$	652	$	366	$	286	$	651	$	337	$	314

Amortization Expense

Amortization expense recorded by the Company for its identifiable intangible assets is presented in the table below.

	Third Quarter Ended				Year-to-Date Ended
	September 27, 2013		September 28, 2012		September 27, 2013		September 28, 2012
	(in millions)
Amortization Expense	$	10	$	13	$	29	$	34

Estimated Amortization Expense

Based on gross carrying amounts at September 27, 2013, the Company’s estimate of amortization expense for identifiable intangible assets for the years ending December 31, 2013 through 2017 are presented in the table below.

	Year Ending December 31,
	2013		2014		2015		2016		2017
	(in millions)
Estimated amortization expense	$	38	$	42	$	39	$	32	$	31

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Pension and Other Postretirement Benefits

9 Months Ended

Sep. 27, 2013

Compensation And Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefits

18.  Pension and Other Postretirement Benefits

The following table summarizes the components of net periodic benefit cost for the Company’s pension and other postretirement benefit plans.

	Pension Plans												Postretirement Benefit Plans
	Third Quarter Ended						Year-to-Date Ended						Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Components of net periodic benefit cost:
Service cost	$	30		$	26		$	95		$	85		$	1		$	—		$	3		$	3
Interest cost		33			34			99			100			2			2			5			7
Expected return on plan assets		(41	)		(37	)		(124	)		(108	)		—			—			(2	)		(2	)
Amortization of prior service costs (credits)		1			1			1			1			(1	)		(1	)		(2	)		(2	)
Amortization of net loss		20			17			63			51			—			—			1			1
Curtailment loss		2			4			2			5			—			—			—			—
Net periodic benefit cost	$	45		$	45		$	136		$	134		$	2		$	1		$	5		$	7

Contributions. The Company contributed cash of $93 million to its pension plans and $5 million to its other postretirement benefit plans during the year-to-date period ended September 27, 2013. The Company expects to contribute an additional $13 million to $52 million to its pension plans and $6 million to its other postretirement benefit plans during the fourth quarter ended December 31, 2013.

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Commitments and Contingencies

9 Months Ended

Sep. 27, 2013

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

17.  Commitments and Contingencies

Guarantees

In connection with the spin-off of Engility, L-3 entered into a Distribution Agreement and several other agreements that govern certain aspects of L-3’s relationship with Engility, including employee matters, tax matters, transition services, and the future supplier/customer relationship between L-3 and Engility. These agreements generally provide cross-indemnities that, except as otherwise provided, are principally designed to place the financial responsibility for the obligations and liabilities of each entity with that respective entity. Engility has joint and several liability with L-3 to the U.S. Internal Revenue Service (IRS) for the consolidated U.S. Federal income taxes of L-3’s consolidated group for taxable periods in which Engility was a part of that group. However, the Tax Matters Agreement specifies the portion of this tax liability for which L-3 and Engility will each bear responsibility, and L-3 and Engility have agreed to indemnify each other against any amounts for which the other is not responsible. The Tax Matters Agreement also allocates responsibility between L-3 and Engility for other taxes, including special rules for allocating tax liabilities in the event that the spin-off is determined not to be tax-free. Though valid as between the parties, the Tax Matters Agreement is not binding on the IRS.

Procurement Regulations

A substantial majority of the Company’s revenues are generated from providing products and services under legally binding agreements or contracts with U.S. Government and foreign government customers. U.S. Government contracts are subject to extensive legal and regulatory requirements, and from time to time, agencies of the U.S. Government investigate whether such contracts were and are being conducted in accordance with these requirements. The Company is currently cooperating with the U.S. Government on several investigations from which civil, criminal or administrative proceedings have or could result and give rise to fines, penalties, compensatory and treble damages, restitution and/or forfeitures. The Company does not currently anticipate that any of these investigations will have a material adverse effect, individually or in the aggregate, on its consolidated financial position, results of operations or cash flows. However, under U.S. Government regulations, an indictment of the Company by a federal grand jury, or an administrative finding against the Company as to its present responsibility to be a U.S. Government contractor or subcontractor, could result in the Company being suspended for a period of time from eligibility for awards of new government contracts or task orders or in a loss of export privileges. A conviction, or an administrative finding against the Company that satisfies the requisite level of seriousness, could result in debarment from contracting with the federal government for a specified term. In addition, all of the Company’s U.S. Government contracts: (1) are subject to audit and various pricing and cost controls, (2) include standard provisions for termination for the convenience of the U.S. Government or for default, and (3) are subject to cancellation if funds for contracts become unavailable. Foreign government contracts generally include comparable provisions relating to terminations for convenience and default, as well as other procurement clauses relevant to the foreign government.

Litigation Matters

The Company is also subject to litigation, proceedings, claims or assessments and various contingent liabilities incidental to its businesses, including those specified below. Furthermore, in connection with certain business acquisitions, the Company has assumed some or all claims against, and liabilities of, such acquired businesses, including both asserted and unasserted claims and liabilities.

In accordance with the accounting standard for contingencies, the Company records a liability when management believes that it is both probable that a liability has been incurred and the Company can reasonably estimate the amount of the loss. Generally, the loss is recorded at the amount the Company expects to resolve the liability. The estimated amounts of liabilities recorded for pending and threatened litigation are disclosed in Note 8. Amounts recoverable from insurance contracts or third parties are recorded as assets when deemed probable. At September 27, 2013, the Company did not record any amounts for recoveries from insurance contracts or third parties in connection with the amount of liabilities recorded for pending and threatened litigation. Legal defense costs are expensed as incurred. The Company believes it has recorded adequate provisions for its litigation matters. The Company reviews these provisions quarterly and adjusts these provisions to reflect the impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter. While it is reasonably possible that an unfavorable outcome may occur in one or more of the following matters, unless otherwise stated below, the Company believes that it is not probable that a loss has been incurred in any of these matters. With respect to the litigation matters below for which it is reasonably possible that an unfavorable outcome may occur, an estimate of loss or range of loss is disclosed when such amount or amounts can be reasonably estimated. Although the Company believes that it has valid defenses with respect to legal matters and investigations pending against it, the results of litigation can be difficult to predict, particularly those involving jury trials. Accordingly, our current judgment as to the likelihood of our loss (or our current estimate as to the potential range of loss, if applicable) with respect to any particular litigation matter may turn out to be wrong. Therefore, it is possible that the financial position, results of operations or cash flows of the Company could be materially adversely affected in any particular period by the unfavorable resolution of one or more of these or other contingencies.

Kalitta Air. On January 31, 1997, a predecessor of Kalitta Air filed a lawsuit in the U.S. District Court for the Northern District of California (the trial court) asserting, among other things, negligence and negligent misrepresentation against Central Texas Airborne Systems, Inc. (CTAS), a predecessor to L-3 Integrated Systems (L-3 IS), in connection with work performed by a predecessor to CTAS to convert two Boeing 747 aircraft from passenger configuration to cargo freighters. CTAS’ insurance carrier has accepted defense of this matter and has retained counsel, subject to a reservation of rights by the insurer to dispute its obligations under the applicable insurance policies in the event a judgment is ultimately rendered against CTAS. The work at issue in the lawsuit was performed using Supplemental Type Certificates (STCs) issued in 1988 by the Federal Aviation Administration (FAA). In 1996, following completion of the work, the FAA issued an airworthiness directive with respect to the STCs that effectively grounded the aircraft. Following two jury trials (in which Kalitta Air did not prevail) and related appeals to the U.S. Court of Appeals for the Ninth Circuit (the Court of Appeals), a third jury trial for this matter began on October 31, 2011, during which Kalitta Air sought damages of approximately $235 million plus an unspecified amount of pre-judgment interest that, in other contexts, has been claimed by Kalitta Air to exceed $240 million. Following the completion of the third trial on November 30, 2011, the jury rendered a verdict in favor of CTAS, finding no negligence on the part of CTAS. The trial court entered a judgment upon the verdict on March 20, 2012. Kalitta Air filed an appeal of the judgment with the Court of Appeals on July 23, 2012. The appeal has been fully briefed, and oral argument has been scheduled for November 8, 2013.

Bashkirian Airways. On July 1, 2004, lawsuits were filed on behalf of the estates of 31 Russian children in the state courts of Washington, Arizona, California, Florida, New York and New Jersey against Honeywell, Honeywell TCAS, Thales USA, Thales France, the Company and Aviation Communications & Surveillance Systems (ACSS), which is a joint venture of L-3 and Thales. The suits relate to the crash over southern Germany of a Bashkirian Airways Tupelov TU 154M aircraft and a DHL Boeing 757 cargo aircraft. On-board the Tupelov aircraft were 9 crew members and 60 passengers, including 45 children. The Boeing aircraft carried a crew of two. Both aircraft were equipped with Honeywell/ACSS Model 2000, Change 7 Traffic Collision and Avoidance Systems (TCAS). Sensing the other aircraft, the on-board DHL TCAS instructed the DHL pilot to descend, and the Tupelov on-board TCAS instructed the Tupelov pilot to climb. However, the Swiss air traffic controller ordered the Tupelov pilot to descend. The Tupelov pilot disregarded the on-board TCAS and put the Tupelov aircraft into a descent striking the DHL aircraft in midair at approximately 35,000 feet. All crew and passengers of both planes were lost. Investigations by the National Transportation Safety Board after the crash revealed that both TCAS units were performing as designed. The suits allege negligence and strict product liability based upon the design of the units and the training provided to resolve conflicting commands and seek approximately $315 million in damages, including $150 million in punitive damages. The Company’s insurers have accepted defense of this matter and have retained counsel. The matters were consolidated in the U.S. District Court for the District of New Jersey, which then dismissed the actions on the basis of forum non conveniens. Plaintiffs representing 30 of the estates re-filed their complaint against ACSS on April 23, 2007 with the Barcelona Court’s Registry in Spain. On March 9, 2010, the court ruled in favor of the plaintiffs and entered judgment against ACSS in the amount of approximately $6.7 million, all of which represented compensatory damages. Both ACSS and the plaintiffs appealed the judgment. In May 2012, the appellate court ruled in favor of the plaintiffs and entered judgment against ACSS in the amount of $48 million. ACSS filed an appeal of the judgment with the Supreme Court of Spain on September 28, 2012. On July 1, 2013, the Supreme Court agreed to consider the appeal, and the parties are awaiting the Supreme Court’s decision. The Company believes that the ruling and the damages awarded are inconsistent with the law and evidence presented, and accordingly, that it is not probable that the Company has incurred a loss with respect to this matter. As of the date of this filing, 18 out of the 30 plaintiffs have released their claims against ACSS in consideration for payments made by the Company’s insurance carriers.

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Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 27, 2013

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

The following table summarizes the components of net periodic benefit cost for the Company’s pension and other postretirement benefit plans.

	Pension Plans												Postretirement Benefit Plans
	Third Quarter Ended						Year-to-Date Ended						Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Components of net periodic benefit cost:
Service cost	$	30		$	26		$	95		$	85		$	1		$	—		$	3		$	3
Interest cost		33			34			99			100			2			2			5			7
Expected return on plan assets		(41	)		(37	)		(124	)		(108	)		—			—			(2	)		(2	)
Amortization of prior service costs (credits)		1			1			1			1			(1	)		(1	)		(2	)		(2	)
Amortization of net loss		20			17			63			51			—			—			1			1
Curtailment loss		2			4			2			5			—			—			—			—
Net periodic benefit cost	$	45		$	45		$	136		$	134		$	2		$	1		$	5		$	7

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New Accounting Standards (Policies)

9 Months Ended

Sep. 27, 2013

Accounting Changes And Error Corrections [Abstract]

Comprehensive Income

Effective January 1, 2013, the Company adopted a new accounting standard issued by the Financial Accounting Standards Board (FASB), which adds new disclosure requirements for items reclassified out of accumulated other comprehensive income (loss) (AOCI). This standard requires entities to disclose additional information about reclassification adjustments, including: (1) changes in AOCI balances by component and (2) significant items reclassified out of AOCI. The adoption of this standard resulted in additional disclosures of items reclassified out of AOCI and did not impact the Company’s financial position, results of operations or cash flows. See Note 11 for these additional disclosures.

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Debt (Tables)

9 Months Ended

Sep. 27, 2013

Debt Disclosure [Abstract]

Components of Debt and Reconciliation to Carrying Amount of Long-Term Debt

The components of debt and a reconciliation to the carrying amount of long-term debt is presented in the table below.

	September 27, 2013			December 31, 2012
	(in millions)
L-3 Communications:
Borrowings under Amended and Restated Revolving Credit Facility(1)	$	—		$	—
3.95% Senior Notes due 2016		500			500
5.20% Senior Notes due 2019		1,000			1,000
4.75% Senior Notes due 2020		800			800
4.95% Senior Notes due 2021		650			650
Subtotal		2,950			2,950
L-3 Holdings:
3% Convertible Contingent Debt Securities due 2035(2)		689			689
Principal amount of long-term debt		3,639			3,639
Unamortized discounts		(9	)		(10	)
Carrying amount of long-term debt	$	3,630		$	3,629

⁽¹⁾  During the year-to-date period ended September 27, 2013, L-3 Communications’ aggregate borrowings and repayments under the Amended and Restated Revolving Credit Facility was $1,382 million. At September 27, 2013, L-3 Communications had the availability of substantially all of its $1 billion Amended and Restated Revolving Credit Facility, which expires on February 3, 2017.

⁽²⁾  Under select conditions, including if L-3 Holdings’ common stock price is more than 120% (currently $108.29) of the then current conversion price (currently $90.24) for a specified period, the conversion feature of the CODES will require L-3 Holdings, upon conversion, to pay the holders of the CODES the principal amount in cash, and if the settlement amount exceeds the principal amount, the excess will be settled in cash or stock or a combination thereof, at the Company’s option. At the current conversion price of $90.24, the aggregate consideration to be delivered upon conversion would be determined based on 7.6 million shares of L-3 Holdings’ common stock. See Note 10 to the audited consolidated financial statements for the year ended December 31, 2012, included in the Company’s Annual Report on Form 10-K, for additional information regarding the CODES, including conditions for conversion. L-3 Holdings’ closing stock price on October 23, 2013 was $95.98 share. Interest expense recognized was $5 million for both quarterly periods ended September 27, 2013 and September 28, 2012 and $15 million for both year-to-date periods ended September 27, 2013 and September 28, 2012. A portion of this interest expense was allocated to discontinued operations for the quarterly and year-to-date periods ended September 28, 2012 as a result of the spin-off of Engility. The carrying amount of the equity component (conversion feature) of the CODES was $64 million at September 27, 2013 and December 31, 2012.

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Segment Information (Tables)

9 Months Ended

Sep. 27, 2013

Segment Reporting [Abstract]

Summary of Segment Information

The tables below present net sales, operating income, depreciation and amortization and total assets by reportable segment.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Net Sales:
C3ISR	$	754		$	889		$	2,533		$	2,642
Electronic Systems		1,368			1,432			4,156			4,191
P&LS		654			715			2,022			2,033
NSS		323			353			987			1,042
Elimination of intercompany sales		(103	)		(106	)		(325	)		(322	)
Consolidated total	$	2,996		$	3,283		$	9,373		$	9,586
Operating Income:
C3ISR	$	63		$	93		$	224		$	272
Electronic Systems		173			158			468			480
P&LS		52			65			176			179
NSS		26			15			66			56
Consolidated total	$	314		$	331		$	934		$	987
Depreciation and amortization:
C3ISR	$	12		$	11		$	33		$	34
Electronic Systems		34			34			105			105
P&LS		4			4			12			15
NSS		2			5			8			11
Consolidated total	$	52		$	54		$	158		$	165

	September 27, 2013		December 31, 2012
	(in millions)
Total Assets:
C3ISR	$	2,051	$	2,030
Electronic Systems		8,277		8,077
P&LS		2,091		1,997
NSS		1,264		1,228
Corporate		392		509
Consolidated total	$	14,075	$	13,841

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Accounting Standards Issued and Not Yet Implemented

9 Months Ended

Sep. 27, 2013

Accounting Changes And Error Corrections [Abstract]

Accounting Standards Issued and Not Yet Implemented

22.  Accounting Standards Issued and Not Yet Implemented

In July 2013, the FASB issued amendments to an accounting standard which requires an unrecognized tax benefit or portion of an unrecognized tax benefit to be presented as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward except when certain conditions exist. The amendments are effective for the Company for fiscal years beginning after December 15, 2013, including that year’s interim periods. The adoption of this standard will not impact the Company’s financial position, results of operations or cash flows.

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Goodwill and Identifiable Intangible Assets - Amortization Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization Expense	$ 10	$ 13	$ 29	$ 34

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Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income - Summary of Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			$ (550)
Other comprehensive loss before reclassifications, net of tax			(20)
Amounts reclassified from other comprehensive income, net of tax			41
Net current period other comprehensive (loss) income			21
Balance at September 27, 2013	(529)		(529)
Cost of sales-products	1,486	1,717	4,729	4,837
Income from continuing operations before income taxes	273	275	814	847
Provision for income taxes	(65)	(80)	(226)	(274)
Income from continuing operations	208	195	588	573
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from continuing operations	13		41
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			167
Other comprehensive loss before reclassifications, net of tax			(18)
Amounts reclassified from other comprehensive income, net of tax
Net current period other comprehensive (loss) income			(18)
Balance at September 27, 2013	149		149
Unrealized Gains (Losses) on Hedging Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			3
Other comprehensive loss before reclassifications, net of tax			(2)
Amounts reclassified from other comprehensive income, net of tax			1
Net current period other comprehensive (loss) income			(1)
Balance at September 27, 2013	2		2
Unrealized Gains (Losses) on Hedging Instruments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales-products			1
Income from continuing operations before income taxes			1
Provision for income taxes
Income from continuing operations			1
Unrecognized Losses and Prior Service Cost, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			(720)
Other comprehensive loss before reclassifications, net of tax
Amounts reclassified from other comprehensive income, net of tax			40
Net current period other comprehensive (loss) income			40
Balance at September 27, 2013	(680)		(680)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss	20		63
Income from continuing operations before income taxes	20		63
Provision for income taxes	(7)		(23)
Income from continuing operations	$ 13		$ 40

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Goodwill and Identifiable Intangible Assets - Identifiable Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	17 years
Gross Carrying Amount	$ 652	$ 651
Accumulated Amortization	366	337
Net Carrying Amount	286	314
Customer Contractual Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	19 years
Gross Carrying Amount	461	460
Accumulated Amortization	246	225
Net Carrying Amount	215	235
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	11 years
Gross Carrying Amount	164	164
Accumulated Amortization	105	98
Net Carrying Amount	59	66
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	17 years
Gross Carrying Amount	27	27
Accumulated Amortization	15	14
Net Carrying Amount	$ 12	$ 13

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 27, 2013

Fair Value Disclosures [Abstract]

Company's Assets and Liabilities at Fair Value on Recurring Basis

The following table presents the fair value hierarchy level for each of the Company’s assets and liabilities that are measured and recorded at fair value on a recurring basis.

	September 27, 2013						December 31, 2012
Description	Level 1(1)		Level 2(2)		Level 3(3)		Level 1(1)		Level 2(2)		Level 3(3)
	(in millions)
Assets
Cash equivalents	$	199	$	—	$	—	$	284	$	—	$	—
Derivatives (foreign currency forward contracts)		—		8		—		—		8		—
Total Assets	$	199	$	8	$	—	$	284	$	8	$	—
Liabilities
Derivatives (foreign currency forward contracts)	$	—	$	2	$	—	$	—	$	3	$	—

⁽¹⁾  Level 1 is based on quoted market prices available in active markets for identical assets or liabilities as of the reporting date. Cash equivalents are primarily held in registered money market funds, which are valued using quoted market prices.

⁽²⁾  Level 2 is based on pricing inputs other than quoted prices in active markets, which are either directly or indirectly observable. The fair value is determined using a valuation model based on observable market inputs, including quoted foreign currency forward exchange rates and consideration of non-performance risk.

⁽³⁾  Level 3 is based on pricing inputs that are not observable and not corroborated by market data. The Company has no Level 3 assets or liabilities.

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Debt - Components of Debt and Reconciliation to Carrying Amount of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Aggregate borrowings and requirements for restated revolving credit facility	$ 1,382
L-3 Communications Corporation's [Member]
Debt Instrument [Line Items]
Borrowings under Amended and Restated Revolving Credit Facility
3.95% Senior Notes due 2016	500	500
5.20% Senior Notes due 2019	1,000	1,000
4.75% Senior Notes due 2020	800	800
4.95% Senior Notes due 2021	650	650
Subtotal	2,950	2,950
L-3 Communications Holdings, Inc. [Member]
Debt Instrument [Line Items]
3% Convertible Contingent Debt Securities due 2035	689	689
Principal amount of long-term debt	3,639	3,639
Unamortized discounts	(9)	(10)
Carrying amount of long-term debt	$ 3,630	$ 3,629

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Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries - Condensed Combining Statements of Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Condensed Financial Statements, Captions [Line Items]
Total net sales	$ 2,996	$ 3,283	$ 9,373	$ 9,586
Total cost of sales	(2,682)	(2,952)	(8,439)	(8,599)
Operating (loss) income	314	331	934	987
Interest expense	(44)	(48)	(131)	(138)
Interest and other income, net	3		11	6
Debt retirement charge		(8)		(8)
(Loss) income from continuing operations before income taxes	273	275	814	847
Benefit (provision) for income taxes	(65)	(80)	(226)	(274)
Equity in net income of consolidated subsidiaries
Income from continuing operations	208	195	588	573
Income (loss) from discontinued operations, net of income tax		(1)		32
Net income	208	194	588	605
Net income attributable to noncontrolling interests	(4)	(2)	(6)	(7)
Net income attributable to L-3	204	192	582	598
Comprehensive income attributable to L-3	254	249	603	661
L-3 Communications Holdings, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Total net sales
Total cost of sales	(14)	(15)	(42)	(44)
Operating (loss) income	(14)	(15)	(42)	(44)
Interest expense	(5)	(5)	(15)	(15)
Interest and other income, net
(Loss) income from continuing operations before income taxes	(19)	(20)	(57)	(59)
Benefit (provision) for income taxes	5	6	16	19
Equity in net income of consolidated subsidiaries	218	206	623	638
Income from continuing operations		192		598
Net income	204	192	582	598
Net income attributable to noncontrolling interests
Net income attributable to L-3	204	192	582	598
Comprehensive income attributable to L-3	254	249	603	661
L-3 Communications Corporation's [Member]
Condensed Financial Statements, Captions [Line Items]
Total net sales	913	892	2,841	2,715
Total cost of sales	(855)	(808)	(2,630)	(2,475)
Operating (loss) income	58	84	211	240
Interest expense	(43)	(48)	(130)	(138)
Interest and other income, net	2	3	6	8
Debt retirement charge		(8)		(8)
(Loss) income from continuing operations before income taxes	17	31	87	102
Benefit (provision) for income taxes	(3)	(9)	(24)	(32)
Equity in net income of consolidated subsidiaries	190	171	519	496
Income from continuing operations		193		566
Income (loss) from discontinued operations, net of income tax		(1)		32
Net income	204	192	582	598
Net income attributable to noncontrolling interests
Net income attributable to L-3	204	192	582	598
Comprehensive income attributable to L-3	254	249	603	661
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Total net sales	1,636	1,929	5,089	5,476
Total cost of sales	(1,443)	(1,743)	(4,550)	(4,936)
Operating (loss) income	193	186	539	540
Interest expense
Interest and other income, net	1	(4)	1	(4)
(Loss) income from continuing operations before income taxes	194	182	540	536
Benefit (provision) for income taxes	(47)	(53)	(150)	(173)
Equity in net income of consolidated subsidiaries
Income from continuing operations		129		363
Net income	147	129	390	363
Net income attributable to noncontrolling interests
Net income attributable to L-3	147	129	390	363
Comprehensive income attributable to L-3	148	129	391	366
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Total net sales	546	550	1,711	1,648
Total cost of sales	(483)	(489)	(1,527)	(1,441)
Operating (loss) income	63	61	184	207
Interest expense	(1)		(1)
Interest and other income, net		1	4	2
(Loss) income from continuing operations before income taxes	62	62	187	209
Benefit (provision) for income taxes	(15)	(18)	(52)	(69)
Equity in net income of consolidated subsidiaries
Income from continuing operations		44		140
Net income	47	44	135	140
Net income attributable to noncontrolling interests
Net income attributable to L-3	47	44	135	140
Comprehensive income attributable to L-3	79	92	112	168
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Total net sales	(99)	(88)	(268)	(253)
Total cost of sales	113	103	310	297
Operating (loss) income	14	15	42	44
Interest expense	5	5	15	15
Interest and other income, net
(Loss) income from continuing operations before income taxes	19	20	57	59
Benefit (provision) for income taxes	(5)	(6)	(16)	(19)
Equity in net income of consolidated subsidiaries	(408)	(377)	(1,142)	(1,134)
Income from continuing operations		(363)		(1,094)
Net income	(394)	(363)	(1,101)	(1,094)
Net income attributable to noncontrolling interests	(4)	(2)	(6)	(7)
Net income attributable to L-3	(398)	(365)	(1,107)	(1,101)
Comprehensive income attributable to L-3	$ (481)	$ (470)	$ (1,106)	$ (1,195)

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Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries - Condensed Combining Statements of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012
Operating activities:
Net cash from operating activities	$ 617
Net cash from operating activities from continuing operations	617	692
Investing activities:
Business acquisitions, net of cash acquired	(2)	(349)
Investments in L-3 Communications
Other investing activities	(139)	212
Net cash used in investing activities from continuing operations	(141)	(137)
Net cash used in investing activities	(141)
Financing activities:
Redemption of senior subordinated notes		(250)
Common stock repurchased	(404)	(504)
Dividends paid on L-3 Holdings common stock	(151)	(149)
Dividends paid to L-3 Holdings
Investments from L-3 Holdings
Other financing activities	109	20
Net cash used in financing activities from continuing operations	(446)	(883)
Net cash used in financing activities	(446)
Effect of foreign currency exchange rate changes on cash	(2)	4
Net increase in cash and cash equivalents of discontinued operations		74
Net increase (decrease) in cash and cash equivalents	28	(250)
Cash and cash equivalents, beginning of the period	349	764
Cash and cash equivalents, end of the period	377	514
L-3 Communications Holdings, Inc. [Member]
Operating activities:
Net cash from operating activities	555
Net cash from operating activities from continuing operations		653
Investing activities:
Business acquisitions, net of cash acquired
Investments in L-3 Communications	(104)	(27)
Other investing activities
Net cash used in investing activities from continuing operations		(27)
Net cash used in investing activities	(104)
Financing activities:
Common stock repurchased	(404)	(504)
Dividends paid on L-3 Holdings common stock	(151)	(149)
Dividends paid to L-3 Holdings
Investments from L-3 Holdings
Other financing activities	104	27
Net cash used in financing activities from continuing operations		(626)
Net cash used in financing activities	(451)
Effect of foreign currency exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents, beginning of the period
Cash and cash equivalents, end of the period
L-3 Communications Corporation's [Member]
Operating activities:
Net cash from operating activities	86
Net cash from operating activities from continuing operations		83
Investing activities:
Business acquisitions, net of cash acquired	(2)	(349)
Investments in L-3 Communications
Other investing activities	(70)	262
Net cash used in investing activities from continuing operations		(87)
Net cash used in investing activities	(72)
Financing activities:
Redemption of senior subordinated notes		(250)
Common stock repurchased
Dividends paid on L-3 Holdings common stock
Dividends paid to L-3 Holdings	(555)	(653)
Investments from L-3 Holdings	104	27
Other financing activities	345	523
Net cash used in financing activities from continuing operations		(353)
Net cash used in financing activities	(106)
Effect of foreign currency exchange rate changes on cash
Net increase in cash and cash equivalents of discontinued operations		74
Net increase (decrease) in cash and cash equivalents	(92)	(283)
Cash and cash equivalents, beginning of the period	246	644
Cash and cash equivalents, end of the period	154	361
Guarantor Subsidiaries [Member]
Operating activities:
Net cash from operating activities	523
Net cash from operating activities from continuing operations		527
Investing activities:
Business acquisitions, net of cash acquired
Investments in L-3 Communications
Other investing activities	(53)	(41)
Net cash used in investing activities from continuing operations		(41)
Net cash used in investing activities	(53)
Financing activities:
Common stock repurchased
Dividends paid on L-3 Holdings common stock
Dividends paid to L-3 Holdings
Investments from L-3 Holdings
Other financing activities	(469)	(485)
Net cash used in financing activities from continuing operations		(485)
Net cash used in financing activities	(469)
Effect of foreign currency exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents	1	1
Cash and cash equivalents, beginning of the period
Cash and cash equivalents, end of the period	1	1
Non-Guarantor Subsidiaries [Member]
Operating activities:
Net cash from operating activities	101
Net cash from operating activities from continuing operations		182
Investing activities:
Business acquisitions, net of cash acquired
Investments in L-3 Communications
Other investing activities	(16)	(9)
Net cash used in investing activities from continuing operations		(9)
Net cash used in investing activities	(16)
Financing activities:
Common stock repurchased
Dividends paid on L-3 Holdings common stock
Dividends paid to L-3 Holdings
Investments from L-3 Holdings
Other financing activities	(81)	(182)
Net cash used in financing activities from continuing operations		(182)
Net cash used in financing activities	(81)
Effect of foreign currency exchange rate changes on cash	(2)	4
Net increase (decrease) in cash and cash equivalents	2	(5)
Cash and cash equivalents, beginning of the period	242	222
Cash and cash equivalents, end of the period	244	217
Eliminations [Member]
Operating activities:
Net cash from operating activities	(648)
Net cash from operating activities from continuing operations		(753)
Investing activities:
Business acquisitions, net of cash acquired
Investments in L-3 Communications	104	27
Other investing activities
Net cash used in investing activities from continuing operations		27
Net cash used in investing activities	104
Financing activities:
Common stock repurchased
Dividends paid on L-3 Holdings common stock
Dividends paid to L-3 Holdings	555	653
Investments from L-3 Holdings	(104)	(27)
Other financing activities	210	137
Net cash used in financing activities from continuing operations		763
Net cash used in financing activities	661
Effect of foreign currency exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents	117	37
Cash and cash equivalents, beginning of the period	(139)	(102)
Cash and cash equivalents, end of the period	$ (22)	$ (65)

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Derivative Financial Instruments

9 Months Ended

Sep. 27, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

16.  Derivative Financial Instruments

The Company’s derivative financial instruments include foreign currency forward contracts, which are entered into for risk management purposes, and an embedded derivative representing the contingent interest payment provision related to the CODES.

Foreign Currency Forward Contracts. The Company’s U.S. and foreign businesses enter into contracts with customers, subcontractors or vendors that are denominated in currencies other than their functional currencies. To protect the functional currency equivalent cash flows associated with certain of these contracts, the Company enters into foreign currency forward contracts. The Company’s activities involving foreign currency forward contracts are designed to hedge the changes in the functional currency equivalent cash flows due to movements in foreign exchange rates compared to the functional currency. The foreign currencies hedged are primarily the Canadian dollar, the U.S. dollar, the Euro, and the British pound. The Company manages exposure to counterparty non-performance credit risk by entering into foreign currency forward contracts with major financial institutions that are expected to fully perform under the terms of such contracts. Foreign currency forward contracts are recorded in the Company’s condensed consolidated balance sheets at fair value and are generally designated and accounted for as cash flow hedges in accordance with the accounting standards for derivative instruments and hedging activities. Gains and losses on designated foreign currency forward contracts that are highly effective in offsetting the corresponding change in the cash flows of the hedged transactions are recorded net of income taxes in AOCI and then recognized in income when the underlying hedged transaction affects income. Gains and losses on foreign currency forward contracts that do not meet hedge accounting criteria are recognized in income immediately. Notional amounts are used to measure the volume of foreign currency forward contracts and do not represent exposure to foreign currency losses. The table below presents the notional amounts of the Company’s outstanding foreign currency forward contracts by currency at September 27, 2013.

Currency	Notional Amounts
	(in millions)
Canadian dollar	$	182
U.S. dollar		119
Euro		59
British pound		21
Total	$	381

At September 27, 2013, the Company’s foreign currency forward contracts had maturities through 2018.

Embedded Derivative. The embedded derivative related to the issuance of the CODES is recorded at fair value, which was zero at September 27, 2013 and December 31, 2012.

The table below presents the location of the Company’s derivative instruments recorded at fair value on the condensed consolidated balance sheets.

	September 27, 2013								December 31, 2012
	Other Current Assets		Other Assets		Other Current Liabilities		Other Liabilities		Other Current Assets		Other Assets		Other Current Liabilities		Other Liabilities
	(in millions)
Derivatives designated as hedging instruments:
Foreign currency forward contracts(1)	$	6	$	2	$	1	$	1	$	4	$	4	$	2	$	1
Derivatives not designated as hedging instruments:
Foreign currency forward contracts(1)		—		—		—		—		—		—		—		—
Embedded derivative related to the CODES		—		—		—		—		—		—		—		—
Total derivative instruments	$	6	$	2	$	1	$	1	$	4	$	4	$	2	$	1

⁽¹⁾  See Note 14 for a description of the fair value hierarchy related to the Company’s foreign currency forward contracts.

The effect of gains or losses from foreign currency forward contracts was not material to the unaudited condensed consolidated statements of operations for the quarterly or year-to-date periods ended September 27, 2013 and September 28, 2012. At September 27, 2013, the estimated amount of existing losses that are expected to be reclassified into income within the next 12 months is $3 million.

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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Statement Of Income And Comprehensive Income [Abstract]
Income tax expense (benefit) on unrealized gains (losses) on hedging instruments	$ 2	$ 1	$ (1)	$ 2
Income tax effect on amortization of net loss and prior service cost previously recognized	$ 7	$ 8	$ 23	$ 20

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Condensed Consolidated Statements of Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012
Cash dividends paid on common stock, per share	$ 1.65	$ 1.50
Retained Earnings [Member]
Cash dividends paid on common stock, per share	$ 1.65	$ 1.50

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Basis of Presentation

9 Months Ended

Sep. 27, 2013

Accounting Policies [Abstract]

Basis of Presentation

2.  Basis of Presentation

These unaudited condensed consolidated financial statements for the quarterly and nine month (year-to-date) periods ended September 27, 2013 should be read in conjunction with the audited consolidated financial statements of L-3 Holdings and L-3 Communications included in their Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

The audited condensed consolidated balance sheet as of December 31, 2012 has been revised for the final purchase price allocation of the Link Simulation & Training U.K. Limited (Link U.K.) business acquisition. Link U.K is the commercial aircraft simulation business acquired from Thales Group effective August 6, 2012. During the third quarter of 2013, the Company completed the purchase price allocation, which was based on the final appraisals and valuations of the acquired assets and liabilities and estimated final closing date net working capital. The L-3 audited condensed consolidated balance sheet as of December 31, 2012 has been adjusted in accordance with the accounting standards for business combinations. See Note 4 for additional information regarding the final purchase price allocation for Link U.K. and resulting adjustments.

Principles of Consolidation and Reporting

The accompanying financial statements comprise the consolidated financial statements of L-3 Holdings and L-3 Communications. L-3 Holdings’ only asset is its investment in the common stock of L-3 Communications, its wholly-owned subsidiary, and its only obligations are: (1) the 3% Convertible Contingent Debt Securities (CODES) due 2035, which were issued by L-3 Holdings on July 29, 2005, (2) its guarantee of borrowings under the Amended and Restated Revolving Credit Facility of L-3 Communications and (3) its guarantee of other contractual obligations of L-3 Communications and its subsidiaries. L-3 Holdings’ obligations relating to the CODES have been jointly, severally, fully and unconditionally guaranteed by L-3 Communications and certain of its wholly-owned domestic subsidiaries. Accordingly, such debt has been reflected as debt of L-3 Communications in its consolidated financial statements in accordance with the accounting standards for pushdown accounting. All issuances of and conversions into L-3 Holdings’ equity securities, including grants of stock options, restricted stock, restricted stock units and performance units by L-3 Holdings to employees and directors of L-3 Communications and its subsidiaries, have been reflected in the consolidated financial statements of L-3 Communications. As a result, the consolidated financial positions, results of operations and cash flows of L-3 Holdings and L-3 Communications are substantially the same. See Note 24 for additional information regarding the unaudited financial information of L-3 Communications and its subsidiaries.

The unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X of the SEC. Accordingly, they do not include all of the disclosures required by U.S. GAAP for a complete set of annual audited financial statements. The December 31, 2012 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair presentation of the results for the interim periods presented have been included. The results of operations for the interim periods are not necessarily indicative of results for the full year.

It is the Company’s established practice to close its books for the quarters ending March, June and September on the Friday nearest to the end of the calendar quarter. The interim unaudited condensed consolidated financial statements included herein have been prepared and are labeled based on that convention. The Company closes its books for annual periods on December 31 regardless of what day it falls on.

Accounting Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of sales and costs of sales during the reporting period. The most significant of these estimates and assumptions for L-3 relate to contract revenue, profit and loss recognition, fair values of assets acquired and liabilities assumed in business combinations, market values for inventories reported at lower of cost or market, pension and post-retirement benefit obligations, stock-based employee compensation expense, income taxes, including the valuation of deferred tax assets, litigation reserves and environmental obligations, accrued product warranty costs, and the recoverability, useful lives and valuation of recorded amounts of long-lived assets, identifiable intangible assets and goodwill. Changes in estimates are reflected in the periods during which they become known. Actual amounts will differ from these estimates and could differ materially.

Sales and profits on contracts that are covered by accounting standards for construction-type and production-type contracts and federal government contractors are recognized using percentage-of-completion (POC) methods of accounting. Approximately 48% of the Company’s net sales in 2012 were accounted for under contract accounting standards, of which, approximately 39% were fixed-price type contracts and approximately 9% were cost-plus type contracts. For contracts accounted for under contract accounting standards, sales and profits are recognized based on: (1) a POC method of accounting (fixed-price contracts), (2) allowable costs incurred plus the estimated profit on those costs (cost-plus contracts), or (3) direct labor hours expended multiplied by the contractual fixed rate per hour plus incurred costs for material (time-and-material contracts). Sales and profits on fixed-price production contracts under which units are produced and delivered in a continuous or sequential process are recorded as units are delivered based on their contractual selling prices (the “units-of-delivery” method). Sales and profits on each fixed-price production contract under which units are not produced and delivered in a continuous or sequential process, or under which a relatively few number of units are produced, are recorded based on the ratio of actual cumulative costs incurred to total estimated costs at completion of the contract multiplied by the total estimated contract revenue, less cumulative sales recognized in prior periods (the “cost-to-cost” method). Under both POC methods of accounting, a single estimated total profit margin is used to recognize profit for each contract over its entire period of performance, which can exceed one year.

Accounting for the sales and profit on these fixed-price type contracts requires the preparation of estimates of: (1) the total contract revenue, (2) the total costs at completion, which is equal to the sum of the actual incurred costs to date on the contract and the estimated costs to complete the contract’s statement of work, and (3) the measurement of progress towards completion. The estimated profit or loss at completion on a contract is equal to the difference between the total estimated contract revenue and the total estimated cost at completion. The profit recorded on a contract in any period using either the units-of-delivery method or cost-to-cost method is equal to the current estimated total profit margin multiplied by the cumulative sales recognized, less the amount of cumulative profit previously recorded for the contract.

Sales and profits on cost-plus type contracts that are covered by contract accounting standards are recognized as allowable costs are incurred on the contract, at an amount equal to the allowable costs plus the estimated profit on those costs. The estimated profit on a cost-plus type contract is fixed or variable based on the contractual fee arrangement. Incentive and award fees are the primary variable fee contractual arrangement types for the Company. Incentive and award fees on cost-plus type contracts are included as an element of total estimated contract revenues and are recorded to sales when a basis exists for the reasonable prediction of performance in relation to established contractual targets and the Company is able to make reasonably dependable estimates for them.

Sales and profits on time-and-material type contracts are recognized on the basis of direct labor hours expended multiplied by the contractual fixed rate per hour, plus the actual costs of materials and other direct non-labor costs.

Revisions or adjustments to estimates for a contract’s revenue, estimated costs at completion and estimated profit or loss are often required as work progresses under a contract, as experience is gained, as facts and circumstances change and as new information is obtained, even though the scope of work required under the contract may not change. Revisions or adjustments may also be required if contract modifications occur. The impact of revisions in profit (loss) estimates for all types of contracts subject to POC accounting are recognized on a cumulative catch-up basis in the period in which the revisions are made. The revisions in contract estimates, if significant, can materially affect the Company’s results of operations and cash flows, as well as reduce the valuations of receivables and inventories, and in some cases result in liabilities to complete contracts in a loss position. Aggregate net changes in contract estimates increased consolidated operating income by $85 million, or 9.1%, for the year-to-date period ended September 27, 2013 and $75 million, or 7.6%, for the year-to-date period ended September 28, 2012.

For a more complete discussion of these estimates and assumptions, see the Annual Report of L-3 Holdings and L-3 Communications on Form 10-K for the fiscal year ended December 31, 2012.

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Equity - Additional Information (Detail) (USD $)	1 Months Ended			9 Months Ended			1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended		1 Months Ended
	Sep. 16, 2013	Jun. 19, 2013	Apr. 30, 2013	Sep. 27, 2013	Sep. 28, 2012	Feb. 05, 2013	Oct. 22, 2013 Subsequent Event [Member]	Sep. 27, 2013 February 5, 2013 Share Repurchase Programs [Member]	Oct. 23, 2013 February 5, 2013 Share Repurchase Programs [Member] Subsequent Event [Member]	Sep. 27, 2013 Common Stock [Member]	Sep. 28, 2012 Common Stock [Member]	Oct. 23, 2013 Common Stock [Member] February 5, 2013 Share Repurchase Programs [Member] Subsequent Event [Member]
Equity [Line Items]
Share repurchase program expired			$ 1,500,000,000
Additional amount of shares authorized to be repurchased						1,500,000,000
Average price per share of repurchased shares				$ 84.59					$ 93.88
Number of common shares repurchased										4,800,000	7,200,000	527,135
Aggregate amount of repurchased shares				404,000,000	504,000,000			168,000,000	49,000,000
Shares repurchased								2,100,000
Remaining value under share repurchase program								1,264,000,000
Cash dividend, declared per share		$ 0.55					$ 0.55
Cash dividend paid	$ 50,000,000			$ 149,000,000	$ 146,000,000
Dividend payable date							Dec. 16, 2013
Dividend record date							Nov. 18, 2013

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Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012
Operating activities:
Net income	$ 588	$ 605
Income from discontinued operations, net of tax		(32)
Income from continuing operations	588	573
Depreciation of property, plant and equipment	122	124
Amortization of intangibles and other assets	36	41
Deferred income tax provision	45	50
Stock-based employee compensation expense	42	44
Contributions to employee savings plans in L-3 Holdings' common stock	90	104
Amortization of pension and postretirement benefit plans net loss and prior service cost	63	51
Amortization of bond discounts and deferred debt issue costs (included in interest expense)	5	5
Other non-cash items	1	9
Changes in operating assets and liabilities, excluding amounts from acquisitions, divestitures and discontinued operations:
Billed receivables	(117)	152
Contracts in process	(36)	(351)
Inventories	(55)	(83)
Other assets	(45)	28
Accounts payable, trade	65	47
Accrued employment costs	27	35
Accrued expenses	(41)	(137)
Advance payments and billings in excess of costs incurred	(109)	107
Income taxes	32	(6)
Excess income tax benefits related to share-based payment arrangements	(3)	(2)
Other current liabilities	(8)	(47)
Pension and postretirement benefits	(23)	(53)
All other operating activities	(62)	1
Net cash from operating activities from continuing operations	617	692
Investing activities:
Contribution received from the spin-off of Engility		335
Business acquisitions, net of cash acquired	(2)	(349)
Proceeds from the sale of a business	4
Capital expenditures	(147)	(124)
Dispositions of property, plant and equipment	10	6
Other investing activities	(6)	(5)
Net cash used in investing activities from continuing operations	(141)	(137)
Financing activities:
Redemption of Senior Notes		(250)
Borrowings under revolving credit facility	1,382	199
Repayment of borrowings under revolving credit facility	(1,382)	(199)
Common stock repurchased	(404)	(504)
Dividends paid on L-3 Holdings' common stock	(151)	(149)
Proceeds from exercises of stock options	91	12
Proceeds from employee stock purchase plan	28	30
Debt issue costs		(6)
Excess income tax benefits related to share-based payment arrangements	3	2
Other financing activities	(13)	(18)
Net cash used in financing activities from continuing operations	(446)	(883)
Effect of foreign currency exchange rate changes on cash and cash equivalents	(2)	4
Cash from (used in) discontinued operations:
Operating activities		75
Financing activities		(1)
Cash from discontinued operations		74
Net increase (decrease) in cash and cash equivalents	28	(250)
Cash and cash equivalents, beginning of the period	349	764
Cash and cash equivalents, end of the period	$ 377	$ 514

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Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income (Tables)

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Summary of Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income

Amounts reclassified out of AOCI for the year-to-date period ended September 27, 2013 are presented in the table below.

	Foreign currency translation			Unrealized gains (losses) on hedging instruments			Unrecognized losses and prior service cost, net			Total accumulated other comprehensive (loss) income
	(in millions)
Balance at December 31, 2012	$	167		$	3		$	(720	)	$	(550	)
Other comprehensive loss before reclassifications, net of tax		(18	)		(2	)		—			(20	)
Amounts reclassified from other comprehensive income, net of tax		—			1			40			41
Net current period other comprehensive (loss) income		(18	)		(1	)		40			21
Balance at September 27, 2013	$	149		$	2		$	(680	)	$	(529	)

Further details regarding the amounts reclassified from AOCI for the quarterly and year-to-date periods ended September 27, 2013 are presented in the table below.

	Amount Reclassified from Accumulated Other Comprehensive (Loss) Income						Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	Third Quarter Ended			Year-to-Date Ended
Details About Accumulated Other Comprehensive (Loss) Income Components	September 27, 2013			September 27, 2013
	(in millions)
Gain on hedging instruments	$	—		$	1		Cost of sales-products
		—			1		Income from continuing operations before income taxes
		—			—		Provision for income taxes
	$	—		$	1		Income from continuing operations
Amortization of defined benefit pension items:
Net loss	$	20		$	63		(a)
		20			63		Income from continuing operations before income taxes
		(7	)		(23	)	Provision for income taxes
	$	13		$	40		Income from continuing operations
Total reclassification for the period	$	13		$	41		Income from continuing operations

^(a)  Amounts related to pension and postretirement benefit plans were reclassified from AOCI and recorded as a component of net periodic benefit cost (see Note 18 for additional information).

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Employee Stock-Based Compensation

9 Months Ended

Sep. 27, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Employee Stock-Based Compensation

19.  Employee Stock-Based Compensation

During the year-to-date period ended September 27, 2013, the Company granted stock-based compensation under the Amended and Restated 2008 Long Term Performance Plan (2008 LTPP) in the form of stock options, restricted stock units and performance units further discussed below.

Stock Options. The Company granted 741,692 stock options with an exercise price equal to the closing price of L-3 Holdings’ common stock on the date of grant. The options expire after 10 years from the date of grant and vest ratably over a three-year period on the annual anniversary of the date of grant. The options granted to our Chairman, President and Chief Executive Officer are also subject to performance-based vesting conditions. The weighted average grant date fair value for the options awarded on February 20, 2013, was $12.09 per option and was estimated using the Black-Scholes option-pricing model. The weighted average assumptions used in the valuation model for this grant are presented in the table below.

Expected holding period (in years)	5.6
Expected volatility	26.4	%
Expected dividend yield	3.6	%
Risk-free interest rate	1.0	%

Restricted Stock Units. The Company granted 604,982 restricted stock units with a weighted average grant date fair value of $77.12 per share. Restricted stock units automatically convert into shares of L-3 Holdings’ common stock upon vesting, and are subject to forfeiture until certain restrictions have lapsed, including a three year cliff vesting period for employees and a one year cliff vesting period for non-employee directors, in each case starting on the date of grant.

Performance Units. The Company granted 61,690 performance units with a weighted average grant date fair value per unit of $77.00. The final payout for these units is based on the achievement of pre-determined EPS goals established by the compensation committee of the Company’s Board of Directors for the three-year period ending December 31, 2015. The payout can range from zero to 200% of the original number of units awarded, which are converted into shares of L-3 Holdings’ common stock based on the then existing closing price at the end of the performance period.

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Employee Severance and Termination Costs

9 Months Ended

Sep. 27, 2013

Restructuring And Related Activities [Abstract]

Employee Severance and Termination Costs

23.  Employee Severance and Termination Costs

Consistent with the Company’s strategy to continuously improve its cost structure and right-size its businesses, especially in view of sequestration and other DoD budget reductions, L-3 is completing employment reduction actions across several of its businesses to reduce both direct and indirect costs, including overhead and general and administrative costs. As a result of these initiatives and due to the impact of sequestration at certain affected business units, the Company recorded $19 million in employee severance and other termination costs with respect to approximately 1,400 employees during the year-to-date period ended September 27, 2013. During the year ended December 31, 2012, the Company recorded a total of $23 million in employee severance and other termination costs with respect to approximately 1,600 employees. Employee severance and other termination costs are reported within cost of sales on the unaudited condensed consolidated statement of operations. The remaining balance to be paid in connection with these initiatives was $8 million at September 27, 2013 and $9 million at December 31, 2012. Employee severance and other termination costs incurred by reportable segment for the year-to-date periods ended September 27, 2013 and September 28, 2012 are presented in the table below.

	Year-to-Date Ended
	September 27, 2013		September 28, 2012
	(in millions)
Reportable Segment
C3ISR	$	5	$	4
Electronic Systems		13		14
P&LS		—		1
NSS		1		—
Consolidated	$	19	$	19

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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Dec. 31, 2012
Schedule Of Income Taxes [Line Items]
Effective tax rate	27.80%	32.30%
Tax benefit	$ 11		$ 17
Provision for income tax due to the expiration of the statue of limitations	10
Anticipated decrease in unrecognized tax benefits over the next 12 months	6
Accrued potential interest included within non-current income taxes payable	10		11
Accrued potential interest included within non-current income taxes payable, after income taxes	6		6
Potential penalties	7		7
U.S. Federal Research and Experimentation Tax Credit [Member]
Schedule Of Income Taxes [Line Items]
Tax benefit	$ 28

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Inventories (Tables)

9 Months Ended

Sep. 27, 2013

Inventory Disclosure [Abstract]

Inventories at Lower of Cost or Market

Inventories at Lower of Cost or Market. The table below presents the components of inventories at the lower of cost (first-in, first-out or average cost) or realizable value.

	September 27, 2013		December 31, 2012
	(in millions)
Raw materials, components and sub-assemblies	$	174	$	168
Work in process		155		124
Finished goods		91		71
Total	$	420	$	363

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Debt - Components of Debt and Reconciliation to Carrying Amount of Long-Term Debt (Parenthetical) (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	9 Months Ended											3 Months Ended		9 Months Ended
	Sep. 27, 2013	Dec. 31, 2012	Sep. 27, 2013 CODES Due 2035 [Member]	Sep. 27, 2013 L-3 Communications Corporation's [Member] 3.95% Senior Notes due 2016 [Member]	Dec. 31, 2012 L-3 Communications Corporation's [Member] 3.95% Senior Notes due 2016 [Member]	Sep. 27, 2013 L-3 Communications Corporation's [Member] 5.20% Senior Notes due 2019 [Member]	Dec. 31, 2012 L-3 Communications Corporation's [Member] 5.20% Senior Notes due 2019 [Member]	Sep. 27, 2013 L-3 Communications Corporation's [Member] 4.75% Senior Notes due 2020 [Member]	Dec. 31, 2012 L-3 Communications Corporation's [Member] 4.75% Senior Notes due 2020 [Member]	Sep. 27, 2013 L-3 Communications Corporation's [Member] 4.95% Senior Notes due 2021 [Member]	Dec. 31, 2012 L-3 Communications Corporation's [Member] 4.95% Senior Notes due 2021 [Member]	Sep. 27, 2013 L-3 Communications Holdings, Inc. [Member]	Sep. 28, 2012 L-3 Communications Holdings, Inc. [Member]	Sep. 27, 2013 L-3 Communications Holdings, Inc. [Member]	Sep. 28, 2012 L-3 Communications Holdings, Inc. [Member]	Oct. 23, 2013 L-3 Communications Holdings, Inc. [Member] Subsequent Event [Member]	Sep. 27, 2013 L-3 Communications Holdings, Inc. [Member] CODES Due 2035 [Member]	Dec. 31, 2012 L-3 Communications Holdings, Inc. [Member] CODES Due 2035 [Member]
Debt Instrument [Line Items]
Interest rate on Senior Notes			3.00%	3.95%	3.95%	5.20%	5.20%	4.75%	4.75%	4.95%	4.95%						3.00%	3.00%
Borrowings under Amended and Restated Revolving Credit Facility	$ 1,000,000,000
Revolving Credit Facility expiry date	Feb. 03, 2017
Excess of current common stock price over common stock conversion price	120.00%
Common stock, shares	7.6
Current convertible common stock price																	$ 108.29
Conversion price of L-3 Holdings' CODES	$ 90.24																$ 90.24
Closing stock price																$ 95.98
Interest expense recognized												5,000,000	5,000,000	15,000,000	15,000,000
Carrying amount of the equity component (conversion feature)	$ 64,000,000	$ 64,000,000

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Dispositions and Acquisitions - Statement of Operations Data Classified as Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of income taxes		$ (1)		$ 32
Net (loss) income from discontinued operations attributable to L-3		(1)		28
Engility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Product and service revenues		68		911
Operating income from discontinued operations before income taxes		2		68
Interest expense allocated to discontinued operations		(1)		(14)
Income from discontinued operations before income taxes		1		54
Income tax expense		(2)		(22)
(Loss) income from discontinued operations, net of income taxes		(1)		32
Net income from discontinued operations attributable to noncontrolling interests				(4)
Net (loss) income from discontinued operations attributable to L-3		$ (1)		$ 28

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Employee Severance and Termination Costs (Tables)

9 Months Ended

Sep. 27, 2013

Restructuring And Related Activities [Abstract]

Employee Severance and Other Termination Costs Incurred by Reportable Segment

Employee severance and other termination costs incurred by reportable segment for the year-to-date periods ended September 27, 2013 and September 28, 2012 are presented in the table below.

	Year-to-Date Ended
	September 27, 2013		September 28, 2012
	(in millions)
Reportable Segment
C3ISR	$	5	$	4
Electronic Systems		13		14
P&LS		—		1
NSS		1		—
Consolidated	$	19	$	19

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 27, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Notional Amounts of Company's Outstanding Foreign Currency Forward Contracts by Currency

The table below presents the notional amounts of the Company’s outstanding foreign currency forward contracts by currency at September 27, 2013.

Currency	Notional Amounts
	(in millions)
Canadian dollar	$	182
U.S. dollar		119
Euro		59
British pound		21
Total	$	381

Location of Company's Derivative Instruments Recorded at Fair Value on Condensed Consolidated Balance Sheets

The table below presents the location of the Company’s derivative instruments recorded at fair value on the condensed consolidated balance sheets.

	September 27, 2013								December 31, 2012
	Other Current Assets		Other Assets		Other Current Liabilities		Other Liabilities		Other Current Assets		Other Assets		Other Current Liabilities		Other Liabilities
	(in millions)
Derivatives designated as hedging instruments:
Foreign currency forward contracts(1)	$	6	$	2	$	1	$	1	$	4	$	4	$	2	$	1
Derivatives not designated as hedging instruments:
Foreign currency forward contracts(1)		—		—		—		—		—		—		—		—
Embedded derivative related to the CODES		—		—		—		—		—		—		—		—
Total derivative instruments	$	6	$	2	$	1	$	1	$	4	$	4	$	2	$	1

⁽¹⁾  See Note 14 for a description of the fair value hierarchy related to the Company’s foreign currency forward contracts.

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Allowances for billed receivables	$ 26	$ 33
Treasury stock (at cost), shares	62,194,678	57,418,645
L-3 Communications Holdings, Inc. [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares outstanding	89,047,037	90,433,743
L-3 Communications Corporation's [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100	100
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100

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Contracts in Process

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Contracts in Process

5.  Contracts in Process

The components of contracts in process are presented in the table below.

	September 27, 2013			December 31, 2012
	(in millions)
Unbilled contract receivables, gross	$	2,714		$	2,879
Unliquidated progress payments		(1,051	)		(1,265	)
Unbilled contract receivables, net		1,663			1,614
Inventoried contract costs, gross		1,093			1,090
Unliquidated progress payments		(65	)		(68	)
Inventoried contract costs, net		1,028			1,022
Total contracts in process	$	2,691		$	2,636

Inventoried Contract Costs. In accordance with contract accounting standards, the Company’s U.S. Government contractor businesses account for the portion of their general and administrative (G&A), independent research and development (IRAD) and bids and proposal (B&P) costs that are allowable and reimbursable indirect contract costs under U.S. Government procurement regulations on their U.S. Government contracts (revenue arrangements) as inventoried contract costs. G&A, IRAD and B&P costs are allocated to contracts for which the U.S. Government is the end customer and are charged to costs of sales when sales on the related contracts are recognized. The Company’s U.S. Government contractor businesses record the unallowable portion of their G&A, IRAD and B&P costs to expense as incurred, and do not include them in inventoried contract costs.

The table below presents a summary of G&A, IRAD and B&P costs included in inventoried contract costs and the changes to them, including amounts charged to cost of sales by the Company’s U.S. Government contractor businesses for the periods presented.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Amounts included in inventoried contract costs at beginning of the period	$	115		$	105		$	110		$	91
IRAD and B&P costs		66			83			219			254
Other G&A costs		218			213			655			647
Total contract costs incurred		284			296			874			901
Amounts charged to cost of sales		(273	)		(289	)		(858	)		(880	)
Amounts included in inventoried contract costs at end of the period	$	126		$	112		$	126		$	112

The table below presents a summary of selling, general and administrative expenses and research and development expenses for the Company’s commercial businesses, which are expensed as incurred and not included in inventoried contract costs.

.	Third Quarter Ended				Year-to-Date Ended
	September 27, 2013		September 28, 2012		September 27, 2013		September 28, 2012
	(in millions)
Selling, general and administrative expenses	$	68	$	58	$	212	$	196
Research and development expenses		17		18		62		63
Total	$	85	$	76	$	274	$	259

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Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 27, 2013		Sep. 28, 2012		Sep. 27, 2013		Sep. 28, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 208		$ 194		$ 588		$ 605
Other comprehensive income:
Foreign currency translation adjustments	34		46		(18)		28
Unrealized gains (losses) on hedging instruments	3	[1]	2	[1]	(1)	[1]	4	[1]
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized	13	[2]	9	[2]	40	[2]	31	[2]
Total other comprehensive income:	50		57		21		63
Comprehensive income	258		251		609		668
Comprehensive income attributable to noncontrolling interests	(4)		(2)		(6)		(7)
Comprehensive income attributable to L-3	$ 254		$ 249		$ 603		$ 661

[1] Amounts are net of income taxes of $2 and $1 million for the quarterly periods ended September 27, 2013 and September 28, 2012, respectively, and income tax benefits of $1 million and income taxes of $2 million for the year-to-date periods ended September 27, 2013 and September 28, 2012, respectively.

[2] Amounts are net of income taxes of $7 million and $8 million for the quarterly periods ended September 27, 2013 and September 28, 2012, respectively, and $23 million and $20 million for the year-to-date periods ended September 27, 2013 and September 28, 2012, respectively.

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Contracts in Process - General and Administrative, Independent Research and Development and Bid and Proposal Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Inventory Disclosure [Abstract]
Amounts included in inventoried contract costs at beginning of the period	$ 115	$ 105	$ 110	$ 91
IRAD and B&P costs	66	83	219	254
Other G&A costs	218	213	655	647
Total contract costs incurred	284	296	874	901
Amounts charged to cost of sales	(273)	(289)	(858)	(880)
Amounts included in inventoried contract costs at end of the period	$ 126	$ 112	$ 126	$ 112

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Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 377	$ 349
Billed receivables, net of allowances of $26 in 2013 and $33 in 2012	1,084	968
Contracts in process	2,691	2,636
Inventories	420	363
Deferred income taxes	98	95
Other current assets	127	144
Total current assets	4,797	4,555
Property, plant and equipment, net	1,023	1,016
Goodwill	7,757	7,776
Identifiable intangible assets	286	314
Deferred debt issue costs	25	29
Other assets	187	151
Total assets	14,075	13,841
Current liabilities:
Accounts payable, trade	558	494
Accrued employment costs	585	551
Accrued expenses	414	462
Advance payments and billings in excess of costs incurred	557	668
Income taxes	6	21
Other current liabilities	383	395
Total current liabilities	2,503	2,591
Pension and postretirement benefits	1,343	1,360
Deferred income taxes	412	328
Other liabilities	357	390
Long-term debt	3,630	3,629
Total liabilities	8,245	8,298
Commitments and contingencies (see Note 17)
L-3 shareholders' equity:
L-3 Communications Holdings, Inc.'s common stock: $.01 par value; 300,000,000 shares authorized, 89,047,037 shares outstanding at September 27, 2013 and 90,433,743 shares outstanding at December 31, 2012 (L-3 Communications Corporation's common stock: $.01 par value, 100 shares authorized, issued and outstanding)	5,555	5,314
L-3 Communications Holdings, Inc.'s treasury stock (at cost), 62,194,678 shares at September 27, 2013 and 57,418,645 shares at December 31, 2012	(4,892)	(4,488)
Retained earnings	5,621	5,191
Accumulated other comprehensive loss	(529)	(550)
Total L-3 shareholders' equity	5,755	5,467
Noncontrolling interests	75	76
Total equity	5,830	5,543
Total liabilities and equity	$ 14,075	$ 13,841

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Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries (Tables)

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Condensed Combining Balance Sheets

	L-3 Holdings (Parent)		L-3 Communications		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Balance Sheets:
At September 27, 2013:
Current assets:
Cash and cash equivalents	$	—	$	154	$	1	$	244	$	(22	)	$	377
Billed receivables, net		—		381		480		223		—			1,084
Contracts in process		—		1,053		1,260		378		—			2,691
Other current assets		—		291		149		205		—			645
Total current assets		—		1,879		1,890		1,050		(22	)		4,797
Goodwill		—		2,290		4,285		1,182		—			7,757
Other assets		—		797		517		207		—			1,521
Investment in and amounts due from consolidated subsidiaries		6,444		7,075		3,584		—		(17,103	)		—
Total assets	$	6,444	$	12,041	$	10,276	$	2,439	$	(17,125	)	$	14,075
Current liabilities	$	—	$	852	$	1,038	$	635	$	(22	)	$	2,503
Amounts due to consolidated subsidiaries		—		—		—		310		(310	)		—
Other long-term liabilities		—		1,804		193		115		—			2,112
Long-term debt		689		3,630		—		—		(689	)		3,630
Total liabilities		689		6,286		1,231		1,060		(1,021	)		8,245
L-3 shareholders’ equity		5,755		5,755		9,045		1,379		(16,179	)		5,755
Noncontrolling interests		—		—		—		—		75			75
Total equity		5,755		5,755		9,045		1,379		(16,104	)		5,830
Total liabilities and equity	$	6,444	$	12,041	$	10,276	$	2,439	$	(17,125	)	$	14,075
At December 31, 2012:
Current assets:
Cash and cash equivalents	$	—	$	246	$	—	$	242	$	(139	)	$	349
Billed receivables, net		—		290		441		237		—			968
Contracts in process		—		945		1,351		340		—			2,636
Other current assets		—		248		163		191		—			602
Total current assets		—		1,729		1,955		1,010		(139	)		4,555
Goodwill		—		1,993		4,586		1,197		—			7,776
Other assets		—		734		565		211		—			1,510
Investment in and amounts due from consolidated subsidiaries		6,156		7,208		3,326		43		(16,733	)		—
Total assets	$	6,156	$	11,664	$	10,432	$	2,461	$	(16,872	)	$	13,841
Current liabilities	$	—	$	823	$	1,255	$	652	$	(139	)	$	2,591
Other long-term liabilities		—		1,745		210		123		—			2,078
Long-term debt		689		3,629		—		—		(689	)		3,629
Total liabilities		689		6,197		1,465		775		(828	)		8,298
L-3 shareholders’ equity		5,467		5,467		8,967		1,686		(16,120	)		5,467
Noncontrolling interests		—		—		—		—		76			76
Total equity		5,467		5,467		8,967		1,686		(16,044	)		5,543
Total liabilities and equity	$	6,156	$	11,664	$	10,432	$	2,461	$	(16,872	)	$	13,841

Condensed Combining Statements of Operations

	L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Operations:
For the quarter ended September 27, 2013:
Total net sales	$	—		$	913		$	1,636		$	546		$	(99	)	$	2,996
Total cost of sales		(14	)		(855	)		(1,443	)		(483	)		113			(2,682	)
Operating (loss) income		(14	)		58			193			63			14			314
Interest expense		(5	)		(43	)		—			(1	)		5			(44	)
Interest and other income, net		—			2			1			—			—			3
(Loss) income before income taxes		(19	)		17			194			62			19			273
Benefit (provision) for income taxes		5			(3	)		(47	)		(15	)		(5	)		(65	)
Equity in net income of consolidated subsidiaries		218			190			—			—			(408	)		—
Net income		204			204			147			47			(394	)		208
Net income attributable to noncontrolling interests		—			—			—			—			(4	)		(4	)
Net income attributable to L-3	$	204		$	204		$	147		$	47		$	(398	)	$	204
Comprehensive income attributable to L-3	$	254		$	254		$	148		$	79		$	(481	)	$	254
For the quarter ended September 28, 2012:
Total net sales	$	—		$	892		$	1,929		$	550		$	(88	)	$	3,283
Total cost of sales		(15	)		(808	)		(1,743	)		(489	)		103			(2,952	)
Operating (loss) income		(15	)		84			186			61			15			331
Interest expense		(5	)		(48	)		—			—			5			(48	)
Interest and other income, net		—			3			(4	)		1			—			—
Debt retirement charge		—			(8	)		—			—			—			(8	)
(Loss) income from continuing operations before income taxes		(20	)		31			182			62			20			275
Benefit (provision) for income taxes		6			(9	)		(53	)		(18	)		(6	)		(80	)
Equity in net income of consolidated subsidiaries from continuing operations		206			171			—			—			(377	)		—
Income from continuing operations		192			193			129			44			(363	)		195
Loss from discontinued operations, net of income tax		—			(1	)		—			—			—			(1	)
Net income		192			192			129			44			(363	)		194
Net income attributable to noncontrolling interests		—			—			—			—			(2	)		(2	)
Net income attributable to L-3	$	192		$	192		$	129		$	44		$	(365	)	$	192
Comprehensive income attributable to L-3	$	249		$	249		$	129		$	92		$	(470	)	$	249

	L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Operations:
For the year-to-date ended September 27, 2013:
Total net sales	$	—		$	2,841		$	5,089		$	1,711		$	(268	)	$	9,373
Total cost of sales		(42	)		(2,630	)		(4,550	)		(1,527	)		310			(8,439	)
Operating (loss) income		(42	)		211			539			184			42			934
Interest expense		(15	)		(130	)		—			(1	)		15			(131	)
Interest and other income, net		—			6			1			4			—			11
(Loss) income from continuing operations before income taxes		(57	)		87			540			187			57			814
Benefit (provision) for income taxes		16			(24	)		(150	)		(52	)		(16	)		(226	)
Equity in net income of consolidated subsidiaries		623			519			—			—			(1,142	)		—
Net income		582			582			390			135			(1,101	)		588
Net income attributable to noncontrolling interests		—			—			—			—			(6	)		(6	)
Net income attributable to L-3	$	582		$	582		$	390		$	135		$	(1,107	)	$	582
Comprehensive income attributable to L-3	$	603		$	603		$	391		$	112		$	(1,106	)	$	603
For the year-to-date ended September 28, 2012:
Total net sales	$	—		$	2,715		$	5,476		$	1,648		$	(253	)	$	9,586
Total cost of sales		(44	)		(2,475	)		(4,936	)		(1,441	)		297			(8,599	)
Operating (loss) income		(44	)		240			540			207			44			987
Interest expense		(15	)		(138	)		—			—			15			(138	)
Interest and other income, net		—			8			(4	)		2			—			6
Debt retirement charge		—			(8	)		—			—			—			(8	)
(Loss) income from continuing operations before income taxes		(59	)		102			536			209			59			847
Benefit (provision) for income taxes		19			(32	)		(173	)		(69	)		(19	)		(274	)
Equity in net income of consolidated subsidiaries from continuing operations		638			496			—			—			(1,134	)		—
Income from continuing operations		598			566			363			140			(1,094	)		573
Income from discontinued operations, net of income tax		—			32			—			—			—			32
Net income		598			598			363			140			(1,094	)		605
Net income attributable to noncontrolling interests		—			—			—			—			(7	)		(7	)
Net income attributable to L-3	$	598		$	598		$	363		$	140		$	(1,101	)	$	598
Comprehensive income attributable to L-3	$	661		$	661		$	366		$	168		$	(1,195	)	$	661

Condensed Combining Statements of Cash Flows

L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Cash Flows:
For the year-to-date ended September 27, 2013:
Operating activities:
Net cash from operating activities	$	555		$	86		$	523		$	101		$	(648	)	$	617
Investing activities:
Business acquisitions, net of cash acquired		—			(2	)		—			—			—			(2	)
Investments in L-3 Communications		(104	)		—			—			—			104			—
Other investing activities		—			(70	)		(53	)		(16	)		—			(139	)
Net cash used in investing activities		(104	)		(72	)		(53	)		(16	)		104			(141	)
Financing activities:
Common stock repurchased		(404	)		—			—			—			—			(404	)
Dividends paid on L-3 Holdings common stock		(151	)		—			—			—			—			(151	)
Dividends paid to L-3 Holdings		—			(555	)		—			—			555			—
Investments from L-3 Holdings		—			104			—			—			(104	)		—
Other financing activities		104			345			(469	)		(81	)		210			109
Net cash used in financing activities		(451	)		(106	)		(469	)		(81	)		661			(446	)
Effect of foreign currency exchange rate changes on cash		—			—			—			(2	)		—			(2	)
Net (decrease) increase in cash		—			(92	)		1			2			117			28
Cash and cash equivalents, beginning of the period		—			246			—			242			(139	)		349
Cash and cash equivalents, end of the period	$	—		$	154		$	1		$	244		$	(22	)	$	377
For the year-to-date ended September 28, 2012:
Operating activities:
Net cash from operating activities from continuing operations	$	653		$	83		$	527		$	182		$	(753	)	$	692
Investing activities:
Business acquisitions, net of cash acquired		—			(349	)		—			—			—			(349	)
Investments in L-3 Communications		(27	)		—			—			—			27			—
Other investing activities		—			262			(41	)		(9	)		—			212
Net cash used in investing activities from continuing operations		(27	)		(87	)		(41	)		(9	)		27			(137	)
Financing activities:
Redemption of senior subordinated notes		—			(250	)		—			—			—			(250	)
Common stock repurchased		(504	)		—			—			—			—			(504	)
Dividends paid on L-3 Holdings common stock		(149	)		—			—			—			—			(149	)
Dividends paid to L-3 Holdings		—			(653	)		—			—			653			—
Investments from L-3 Holdings		—			27			—			—			(27	)		—
Other financing activities		27			523			(485	)		(182	)		137			20
Net cash used in financing activities from continuing operations		(626	)		(353	)		(485	)		(182	)		763			(883	)
Effect of foreign currency exchange rate changes on cash		—			—			—			4			—			4
Net increase in cash and cash equivalents of discontinued operations		—			74			—			—			—			74
Net (decrease) increase in cash		—			(283	)		1			(5	)		37			(250	)
Cash and cash equivalents, beginning of the period		—			644			—			222			(102	)		764
Cash and cash equivalents, end of the period	$	—		$	361		$	1		$	217		$	(65	)	$	514

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Derivative Financial Instruments - Notional Amounts of Company's Outstanding Foreign Currency Forward Contracts by Currency (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	$ 381
Canadian Dollar [Member]
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	182
U.S. Dollar [Member]
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	119
Euro [Member]
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	59
British Pound [Member]
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	$ 21

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L-3 Holdings' Earnings Per Common Share - Reconciliation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) (USD $)	Sep. 27, 2013
Earnings Per Share [Abstract]
Conversion price of L-3 Holdings' CODES	$ 90.24

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Supplemental Cash Flow Information

9 Months Ended

Sep. 27, 2013

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

20.  Supplemental Cash Flow Information

	Year-to-Date Ended
	September 27, 2013		September 28, 2012
	(in millions)
Interest paid on outstanding debt	$	133	$	152
Income tax payments		168		248
Income tax refunds		20		18

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Fair Value Measurements

9 Months Ended

Sep. 27, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

14.  Fair Value Measurements

The following table presents the fair value hierarchy level for each of the Company’s assets and liabilities that are measured and recorded at fair value on a recurring basis.

	September 27, 2013						December 31, 2012
Description	Level 1(1)		Level 2(2)		Level 3(3)		Level 1(1)		Level 2(2)		Level 3(3)
	(in millions)
Assets
Cash equivalents	$	199	$	—	$	—	$	284	$	—	$	—
Derivatives (foreign currency forward contracts)		—		8		—		—		8		—
Total Assets	$	199	$	8	$	—	$	284	$	8	$	—
Liabilities
Derivatives (foreign currency forward contracts)	$	—	$	2	$	—	$	—	$	3	$	—

⁽¹⁾  Level 1 is based on quoted market prices available in active markets for identical assets or liabilities as of the reporting date. Cash equivalents are primarily held in registered money market funds, which are valued using quoted market prices.

⁽²⁾  Level 2 is based on pricing inputs other than quoted prices in active markets, which are either directly or indirectly observable. The fair value is determined using a valuation model based on observable market inputs, including quoted foreign currency forward exchange rates and consideration of non-performance risk.

⁽³⁾  Level 3 is based on pricing inputs that are not observable and not corroborated by market data. The Company has no Level 3 assets or liabilities.

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Financial Instruments (Tables)

9 Months Ended

Sep. 27, 2013

Investments All Other Investments [Abstract]

Carrying Amounts and Estimated Fair Values of Company's Long-Term Debt and Foreign Currency Forward Contracts

The carrying amounts and estimated fair values of the Company’s financial instruments are presented in the table below.

	September 27, 2013				December 31, 2012
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
	(in millions)
Senior Notes(1)	$	2,941	$	3,131	$	2,940	$	3,301
CODES(1)		689		752		689		697
Foreign currency forward contracts(2)		6		6		5		5

⁽¹⁾  The Company measures the fair value of its Senior Notes and CODES using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market.

⁽²⁾  See Note 16 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts.

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Fair Value Measurements - Company's Assets and Liabilities at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Level 1 [Member]
Assets
Cash equivalents	$ 199	$ 284
Derivatives (foreign currency forward contracts)
Total Assets	199	284
Liabilities
Derivatives (foreign currency forward contracts)
Level 2 [Member]
Assets
Cash equivalents
Derivatives (foreign currency forward contracts)	8	8
Total Assets	8	8
Liabilities
Derivatives (foreign currency forward contracts)	2	3
Level 3 [Member]
Assets
Cash equivalents
Derivatives (foreign currency forward contracts)
Total Assets
Liabilities
Derivatives (foreign currency forward contracts)

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Dispositions and Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended				3 Months Ended	9 Months Ended
	Dec. 31, 2012 Business	Sep. 27, 2013	Dec. 31, 2012 Kollmorgen Electro-Optical [Member]	Sep. 27, 2013 Link U.K. [Member] Adjustments to Preliminary Valuations Adjustments [Member]	Sep. 28, 2012 Engility [Member]	Sep. 28, 2012 Engility [Member]
Acquisitions And Discontinued Operations [Line Items]
Transaction expenses in connection with the spin-off, before income taxes						$ 19
Transaction expenses in connection with the spin-off, after income taxes						14
Interest expense for debt					1	14
Aggregate purchase price of acquisitions			349
Amount of goodwill recognized	7,776	7,757	282	32
Goodwill deductible for income tax purposes			184
Number of businesses acquired	3
Other liabilities				17
Contracts in process				$ (16)

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Goodwill and Identifiable Intangible Assets - Estimated Amortization Expense (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Estimated amortization expense, 2013	$ 38
Estimated amortization expense, 2014	42
Estimated amortization expense, 2015	39
Estimated amortization expense, 2016	32
Estimated amortization expense, 2017	$ 31

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Other Current Liabilities and Other Liabilities (Tables)

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Other Current Liabilities

The table below presents the components of other current liabilities.

	September 27, 2013		December 31, 2012
	(in millions)
Other Current Liabilities:
Accruals for pending and threatened litigation (see Note 17)	$	5	$	7
Accrued product warranty costs		76		78
Estimated costs in excess of estimated contract value to complete contracts in process in a loss position		67		72
Accrued interest		46		53
Deferred revenues		38		37
Estimated contingent purchase price payable for acquired businesses		—		4
Other		151		144
Total other current liabilities	$	383	$	395

Other Liabilities

The table below presents the components of other liabilities.

	September 27, 2013		December 31, 2012
	(in millions)
Other Liabilities:
Non-current income taxes payable (see Note 10)	$	145	$	137
Accrued workers’ compensation		53		57
Deferred compensation		45		43
Accrued product warranty costs		24		22
Notes payable and capital lease obligations		17		24
Estimated contingent purchase price payable for acquired businesses		—		5
Other		73		102
Total other liabilities	$	357	$	390

Changes in Company's Accrued Product Warranty Costs

The table below presents the changes in the Company’s accrued product warranty costs.

	Year-to-Date Ended
	September 27, 2013			September 28, 2012
	(in millions)
Accrued product warranty costs:(1)
Balance at January 1	$	100		$	94
Acquisitions during the period		—			2
Accruals for product warranties issued during the period		56			56
Settlements made during the period		(56	)		(58	)
Balance at end of period	$	100		$	94

⁽¹⁾  Warranty obligations incurred in connection with long-term production contracts that are accounted for under the POC cost-to-cost method are included within the contract estimates at completion and are excluded from the above amounts. The balances above include both the current and non-current amounts.

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Dispositions and Acquisitions (Tables)

9 Months Ended

Sep. 27, 2013

Business Combinations [Abstract]

Statement of Operations Data Classified as Discontinued Operations

Statement of operations data classified as discontinued operations related to Engility is provided in the table below.

	Third Quarter Ended			Year-to-Date Ended
	September 28, 2012			September 28, 2012
	(in millions)
Product and service revenues	$	68		$	911
Operating income from discontinued operations before income taxes		2			68
Interest expense allocated to discontinued operations		(1	)		(14	)
Income from discontinued operations before income taxes	$	1		$	54
Income tax expense		(2	)		(22	)
(Loss) income from discontinued operations, net of income taxes	$	(1	)	$	32
Net income from discontinued operations attributable to noncontrolling interests		—			(4	)
Net (loss) income from discontinued operations attributable to L-3	$	(1	)	$	28

Unaudited Pro Forma Statements of Operations Data

The following unaudited pro forma Statement of Operations data presents the combined results of the Company and its business acquisitions completed during the year ended December 31, 2012, in each case assuming that the business acquisitions completed during the year ended December 31, 2012 had occurred on January 1, 2012.

	Third Quarter Ended		Year-to-Date  Ended
	September 28, 2012		September 28, 2012
	(in millions, except per share data)
Pro forma net sales	$	3,295	$	9,688
Pro forma income from continuing operations		195		574
Pro forma net income attributable to L-3		192		599
Pro forma diluted earnings per share from continuing operations		1.98		5.79
Pro forma diluted earnings per share		1.97		6.07

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Contracts in Process (Tables)

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Components of Contracts in Process

The components of contracts in process are presented in the table below.

	September 27, 2013			December 31, 2012
	(in millions)
Unbilled contract receivables, gross	$	2,714		$	2,879
Unliquidated progress payments		(1,051	)		(1,265	)
Unbilled contract receivables, net		1,663			1,614
Inventoried contract costs, gross		1,093			1,090
Unliquidated progress payments		(65	)		(68	)
Inventoried contract costs, net		1,028			1,022
Total contracts in process	$	2,691		$	2,636

General and Administrative, Independent Research and Development and Bid and Proposal Costs

The table below presents a summary of G&A, IRAD and B&P costs included in inventoried contract costs and the changes to them, including amounts charged to cost of sales by the Company’s U.S. Government contractor businesses for the periods presented.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Amounts included in inventoried contract costs at beginning of the period	$	115		$	105		$	110		$	91
IRAD and B&P costs		66			83			219			254
Other G&A costs		218			213			655			647
Total contract costs incurred		284			296			874			901
Amounts charged to cost of sales		(273	)		(289	)		(858	)		(880	)
Amounts included in inventoried contract costs at end of the period	$	126		$	112		$	126		$	112

Selling, General and Administrative Expenses and Research and Development Expenses

The table below presents a summary of selling, general and administrative expenses and research and development expenses for the Company’s commercial businesses, which are expensed as incurred and not included in inventoried contract costs.

	Third Quarter Ended				Year-to-Date Ended
	September 27, 2013		September 28, 2012		September 27, 2013		September 28, 2012
	(in millions)
Selling, general and administrative expenses	$	68	$	58	$	212	$	196
Research and development expenses		17		18		62		63
Total	$	85	$	76	$	274	$	259

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Dispositions and Acquisitions

9 Months Ended

Sep. 27, 2013

Business Combinations [Abstract]

Dispositions and Acquisitions

4.  Dispositions and Acquisitions

2012 Spin-off of Engility

The Company completed the spin-off of its subsidiary, Engility Holdings, Inc. (Engility), to its shareholders on July 17, 2012. L-3 incurred transaction expenses in connection with the spin-off of $19 million ($14 million after income taxes) for the year-to-date period ended September 28, 2012, which have been included in discontinued operations. In addition, L-3 allocated interest expense for debt not directly attributable or related to L-3’s other operations of $14 million to discontinued operations for the year-to-date period ended September 28, 2012. Interest expense was allocated in accordance with the accounting standards for discontinued operations and was based on the ratio of Engility net assets to the sum of: (1) total L-3 consolidated net assets and (2) L-3 consolidated total debt.

Statement of operations data classified as discontinued operations related to Engility is provided in the table below.

	Third Quarter Ended			Year-to-Date Ended
	September 28, 2012			September 28, 2012
	(in millions)
Product and service revenues	$	68		$	911
Operating income from discontinued operations before income taxes		2			68
Interest expense allocated to discontinued operations		(1	)		(14	)
Income from discontinued operations before income taxes	$	1		$	54
Income tax expense		(2	)		(22	)
(Loss) income from discontinued operations, net of income taxes	$	(1	)	$	32
Net income from discontinued operations attributable to noncontrolling interests		—			(4	)
Net (loss) income from discontinued operations attributable to L-3	$	(1	)	$	28

 

2012 Business Acquisitions

All of the business acquisitions discussed below are included in the Company’s results of operations from their respective dates of acquisition.

During the year ended December 31, 2012, in separate transactions, the Company acquired: (1) the Kollmorgen Electro-Optical (L-3 KEO) business, (2) the assets and liabilities of MAVCO, Inc. (MAVCO), and (3) Link U.K., for an aggregate purchase price of $349 million. All business acquisitions were financed with cash on hand. Based on the final purchase price allocations, the aggregate goodwill recognized for these acquired businesses was $282 million, of which $184 million is expected to be deductible for income tax purposes. The goodwill recognized for these three acquired businesses was assigned to the Electronic Systems segment.

The purchase prices and purchase price allocations for L-3 KEO and MAVCO were finalized as of June 28, 2013 and December 31, 2012, respectively, with no significant changes from the preliminary amounts. The Link U.K. purchase price allocation was finalized as of September 27, 2013 based on the results of the final appraisals and valuations of the assets and liabilities acquired and estimated final closing date net working capital. The final purchase price allocation resulted in certain adjustments to the preliminary valuations, the most significant of which included an increase to goodwill of $32 million, an increase to other liabilities of $17 million, and a decrease of $16 million to contracts in process. As discussed in Note 2, the audited condensed consolidated balance sheet as of December 31, 2012 has been revised for these adjustments in accordance with accounting standards for business combinations.

The final purchase price for the Link U.K. acquisition is subject to adjustment based on final closing date net working capital, which is currently in negotiation and is expected to be completed by December 31, 2013. Differences between the estimated and final closing date net working capital will impact goodwill.

Unaudited Pro Forma Statement of Operations Data

The following unaudited pro forma Statement of Operations data presents the combined results of the Company and its business acquisitions completed during the year ended December 31, 2012, in each case assuming that the business acquisitions completed during the year ended December 31, 2012 had occurred on January 1, 2012.

	Third Quarter Ended		Year-to-Date Ended
	September 28, 2012		September 28, 2012
	(in millions, except per share data)
Pro forma net sales	$	3,295	$	9,688
Pro forma income from continuing operations		195		574
Pro forma net income attributable to L-3		192		599
Pro forma diluted earnings per share from continuing operations		1.98		5.79
Pro forma diluted earnings per share		1.97		6.07

The unaudited pro forma results disclosed in the table above are based on various assumptions and are not necessarily indicative of the results of operations that would have occurred had the Company completed these acquisitions on January 1, 2012.

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Goodwill and Identifiable Intangible Assets - Additional Information (Detail) (Operating Segments [Member], Electronic Systems [Member], USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Operating Segments [Member] | Electronic Systems [Member]
Goodwill [Line Items]
Accumulated goodwill impairment losses	$ 58	$ 58

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Segment Information - Summary of Segment Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012	Dec. 31, 2012
Net Sales:
Net sales	$ 2,996	$ 3,283	$ 9,373	$ 9,586
Operating income	314	331	934	987
Depreciation and amortization	52	54	158	165
Total Assets:
Total assets	14,075		14,075		13,841
Operating Segments [Member] | C3ISR [Member]
Net Sales:
Net sales	754	889	2,533	2,642
Operating income	63	93	224	272
Depreciation and amortization	12	11	33	34
Total Assets:
Total assets	2,051		2,051		2,030
Operating Segments [Member] | Electronic Systems [Member]
Net Sales:
Net sales	1,368	1,432	4,156	4,191
Operating income	173	158	468	480
Depreciation and amortization	34	34	105	105
Total Assets:
Total assets	8,277		8,277		8,077
Operating Segments [Member] | P&LS [Member]
Net Sales:
Net sales	654	715	2,022	2,033
Operating income	52	65	176	179
Depreciation and amortization	4	4	12	15
Total Assets:
Total assets	2,091		2,091		1,997
Operating Segments [Member] | NSS [Member]
Net Sales:
Net sales	323	353	987	1,042
Operating income	26	15	66	56
Depreciation and amortization	2	5	8	11
Total Assets:
Total assets	1,264		1,264		1,228
Corporate [Member]
Total Assets:
Total assets	392		392		509
Elimination of intercompany sales [Member]
Net Sales:
Net sales	$ (103)	$ (106)	$ (325)	$ (322)

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Segment Information

9 Months Ended

Sep. 27, 2013

Segment Reporting [Abstract]

Segment Information

21.  Segment Information

The Company has four reportable segments, as described in Note 1. The Company evaluates the performance of its operating segments and reportable segments based on their sales and operating income. All corporate expenses are allocated to the Company’s operating segments using an allocation methodology prescribed by U.S. Government regulations for government contractors. Accordingly, all costs and expenses are included in the Company’s measure of segment profitability. Certain corporate expenses of $10 million for the year-to-date period ended September 28, 2012, that had previously been allocated to the Engility businesses, were retained by the Company and have been allocated to L-3’s four reportable segments.

The tables below present net sales, operating income, depreciation and amortization and total assets by reportable segment.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions)
Net Sales:
C3ISR	$	754		$	889		$	2,533		$	2,642
Electronic Systems		1,368			1,432			4,156			4,191
P&LS		654			715			2,022			2,033
NSS		323			353			987			1,042
Elimination of intercompany sales		(103	)		(106	)		(325	)		(322	)
Consolidated total	$	2,996		$	3,283		$	9,373		$	9,586
Operating Income:
C3ISR	$	63		$	93		$	224		$	272
Electronic Systems		173			158			468			480
P&LS		52			65			176			179
NSS		26			15			66			56
Consolidated total	$	314		$	331		$	934		$	987
Depreciation and amortization:
C3ISR	$	12		$	11		$	33		$	34
Electronic Systems		34			34			105			105
P&LS		4			4			12			15
NSS		2			5			8			11
Consolidated total	$	52		$	54		$	158		$	165

	September 27, 2013		December 31, 2012
	(in millions)
Total Assets:
C3ISR	$	2,051	$	2,030
Electronic Systems		8,277		8,077
P&LS		2,091		1,997
NSS		1,264		1,228
Corporate		392		509
Consolidated total	$	14,075	$	13,841

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L-3 Holdings' Earnings Per Common Share (Tables)

9 Months Ended

Sep. 27, 2013

Earnings Per Share [Abstract]

Reconciliation of Basic and Diluted Earnings Per Share

A reconciliation of basic and diluted earnings per share (EPS) is presented in the table below.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions, except per share data)
Reconciliation of net income:
Net income	$	208		$	194		$	588		$	605
Net income from continuing operations attributable to noncontrolling interests		(4	)		(2	)		(6	)		(3	)
Net income from discontinued operations attributable to noncontrolling interests		—			—			—			(4	)
Net income attributable to L-3 Holdings’ common shareholders	$	204		$	192		$	582		$	598
Earnings (loss) attributable to L-3 Holdings’ common shareholders:
Continuing operations	$	204		$	193		$	582		$	570
Discontinued operations, net of income tax		—			(1	)		—			28
Net income attributable to L-3 Holdings’ common shareholders	$	204		$	192		$	582		$	598
Earnings (loss) per share attributable to L-3 Holdings’ common shareholders:
Basic:
Weighted average common shares outstanding		89.6			96.1			89.9			97.4
Basic earnings (loss) per share:
Continuing operations	$	2.28		$	2.01		$	6.47		$	5.85
Discontinued operations, net of income tax		—			(0.01	)		—			0.29
Basic earnings per share	$	2.28		$	2.00		$	6.47		$	6.14
Diluted:
Common and potential common shares:
Weighted average common shares outstanding		89.6			96.1			89.9			97.4
Assumed exercise of stock options		4.7			2.1			3.9			1.7
Unvested restricted stock awards		1.8			2.0			1.8			2.1
Employee stock purchase plan contributions		0.2			0.3			0.2			0.3
Performance unit awards		0.1			—			0.1			—
Assumed purchase of common shares for treasury		(5.2	)		(3.1	)		(4.7	)		(2.8	)
Assumed conversion of the CODES(1)		0.1			—			0.1			—
Common and potential common shares		91.3			97.4			91.3			98.7
Diluted earnings (loss) per share:
Continuing operations	$	2.23		$	1.98		$	6.37		$	5.78
Discontinued operations, net of income tax		—			(0.01	)		—			0.28
Diluted earnings per share	$	2.23		$	1.97		$	6.37		$	6.06

⁽¹⁾  L-3 Holdings’ CODES had no impact on diluted EPS for the quarterly or year-to-date periods ended September 28, 2012 as the average market price of L-3 Holdings common stock during these periods was less than the price at which the CODES would have been convertible into L-3 Holdings common stock. As of September 27, 2013, the conversion price was $90.24.

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Goodwill and Identifiable Intangible Assets

9 Months Ended

Sep. 27, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Identifiable Intangible Assets

7.  Goodwill and Identifiable Intangible Assets

Goodwill. In accordance with the accounting standards for business combinations, the Company records the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition (commonly referred to as the purchase price allocation). The table below presents the changes in goodwill by segment for the year-to-date period ended September 27, 2013.

	C3ISR		Electronic Systems			P&LS			NSS		Consolidated Total
	(in millions)
Balance at December 31, 2012	$	797	$	4,836		$	1,175		$	968	$	7,776
Business dispositions		—		(2	)		—			—		(2	)
Foreign currency translation adjustments(1)		—		(7	)		(10	)		—		(17	)
Balance at September 27, 2013	$	797	$	4,827		$	1,165		$	968	$	7,757

⁽¹⁾  The decreases in goodwill presented in the Electronic Systems and P&LS segments were primarily due to the strengthening of the U.S. dollar against the Canadian dollar and Australian dollar, partially offset by the weakening of the U.S. dollar against the Euro during the year-to-date period ended September 27, 2013.

The Company’s accumulated goodwill impairment losses, which were recorded in the Electronic Systems segment, were $58 million at September 27, 2013 and December 31, 2012.

Identifiable Intangible Assets. Information on the Company’s identifiable intangible assets that are subject to amortization is presented in the table below.

	September 27, 2013								December 31, 2012
	Weighted Average Amortization Period		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in years)						(in millions)
Customer contractual relationships		19	$	461	$	246	$	215	$	460	$	225	$	235
Technology		11		164		105		59		164		98		66
Other		17		27		15		12		27		14		13
Total		17	$	652	$	366	$	286	$	651	$	337	$	314

Amortization expense recorded by the Company for its identifiable intangible assets is presented in the table below.

	Third Quarter Ended				Year-to-Date Ended
	September 27, 2013		September 28, 2012		September 27, 2013		September 28, 2012
	(in millions)
Amortization Expense	$	10	$	13	$	29	$	34

Based on gross carrying amounts at September 27, 2013, the Company’s estimate of amortization expense for identifiable intangible assets for the years ending December 31, 2013 through 2017 are presented in the table below.

	Year Ending December 31,
	2013		2014		2015		2016		2017
	(in millions)
Estimated amortization expense	$	38	$	42	$	39	$	32	$	31

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Employee Severance and Termination Costs - Employee Severance and Other Termination Costs Incurred by Reportable Segment (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Dec. 31, 2012
Reportable Segment:
Employee severance and other related termination costs	$ 19	$ 19	$ 23
C3ISR [Member]
Reportable Segment:
Employee severance and other related termination costs	5	4
Electronic Systems [Member]
Reportable Segment:
Employee severance and other related termination costs	13	14
P&LS [Member]
Reportable Segment:
Employee severance and other related termination costs		1
NSS [Member]
Reportable Segment:
Employee severance and other related termination costs	$ 1

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L-3 Holdings' Earnings Per Common Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Reconciliation of net income:
Net income	$ 208	$ 194	$ 588	$ 605
Net income from continuing operations attributable to noncontrolling interests	(4)	(2)	(6)	(3)
Net income from discontinued operations attributable to noncontrolling interests				(4)
Net income attributable to L-3	204	192	582	598
Earnings (loss) attributable to L-3 Holdings' common shareholders:
Continuing operations	204	193	582	570
Discontinued operations, net of income tax		(1)		28
Net income attributable to L-3	$ 204	$ 192	$ 582	$ 598
Basic:
Weighted average common shares outstanding	89.6	96.1	89.9	97.4
Basic earnings (loss) per share:
Continuing operations	$ 2.28	$ 2.01	$ 6.47	$ 5.85
Discontinued operations, net of income tax		$ (0.01)		$ 0.29
Basic earnings per share	$ 2.28	$ 2.00	$ 6.47	$ 6.14
Common and potential common shares:
Weighted average common shares outstanding	89.6	96.1	89.9	97.4
Assumed purchase of common shares for treasury	(5.2)	(3.1)	(4.7)	(2.8)
Assumed conversion of the CODES	0.1		0.1
Common and potential common shares	91.3	97.4	91.3	98.7
Diluted earnings (loss) per share:
Continuing operations	$ 2.23	$ 1.98	$ 6.37	$ 5.78
Discontinued operations, net of income tax		$ (0.01)		$ 0.28
Diluted earnings per share	$ 2.23	$ 1.97	$ 6.37	$ 6.06
Assumed Exercise of Stock Options [Member]
Common and potential common shares:
Common and potential common shares	4.7	2.1	3.9	1.7
Unvested Restricted Stock Awards [Member]
Common and potential common shares:
Common and potential common shares	1.8	2.0	1.8	2.1
Employee Stock Purchase Plan Contributions [Member]
Common and potential common shares:
Common and potential common shares	0.2	0.3	0.2	0.3
Performance Unit Awards [Member]
Common and potential common shares:
Common and potential common shares	0.1		0.1

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New Accounting Standards

9 Months Ended

Sep. 27, 2013

Accounting Changes And Error Corrections [Abstract]

New Accounting Standards

3.  New Accounting Standards

Effective January 1, 2013, the Company adopted a new accounting standard issued by the Financial Accounting Standards Board (FASB), which adds new disclosure requirements for items reclassified out of accumulated other comprehensive income (loss) (AOCI). This standard requires entities to disclose additional information about reclassification adjustments, including: (1) changes in AOCI balances by component and (2) significant items reclassified out of AOCI. The adoption of this standard resulted in additional disclosures of items reclassified out of AOCI and did not impact the Company’s financial position, results of operations or cash flows. See Note 11 for these additional disclosures.

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Condensed Consolidated Statements of Equity (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2011	$ 6,724	$ 1	$ 5,063	$ (3,616)	$ 5,641	$ (454)	$ 89
Beginning Balance, Shares at Dec. 31, 2011		99,000,000
Net income	605				598		7
Other comprehensive income	63					63
Distributions to noncontrolling interests	(7)						(7)
Cash dividends paid on common stock	(146)				(146)
Shares issued:
Employee savings plans	111		111
Employee savings plans, Shares		1,700,000
Exercise of stock options	12		12
Exercise of stock options, Shares		200,000
Employee stock purchase plan	21		21
Employee stock purchase plan, Shares		700,000
Stock-based compensation expense	46		46
Contributions received from the spin-off of Engility	335				335
Spin-off of Engility	(1,406)				(1,393)		(13)
Treasury stock purchased	(504)			(504)
Treasury stock purchased, Shares		(7,200,000)
Other	(12)		(10)		(2)
Other, Shares		400,000
Ending Balance at Sep. 28, 2012	5,842	1	5,243	(4,120)	5,033	(391)	76
Ending Balance, Shares at Sep. 28, 2012		94,800,000
Beginning Balance at Dec. 31, 2012	5,543	1	5,313	(4,488)	5,191	(550)	76
Beginning Balance, Shares at Dec. 31, 2012		90,400,000
Net income	588				582		6
Other comprehensive income	21					21
Distributions to noncontrolling interests	(7)						(7)
Cash dividends paid on common stock	(149)				(149)
Shares issued:
Employee savings plans	97		97
Employee savings plans, Shares		1,300,000
Exercise of stock options	90		90
Exercise of stock options, Shares		1,300,000
Employee stock purchase plan	18		18
Employee stock purchase plan, Shares		500,000
Stock-based compensation expense	42		42
Treasury stock purchased	(404)			(404)
Treasury stock purchased, Shares		(4,800,000)
Other	(9)		(6)		(3)
Other, Shares		300,000
Ending Balance at Sep. 27, 2013	$ 5,830	$ 1	$ 5,554	$ (4,892)	$ 5,621	$ (529)	$ 75
Ending Balance, Shares at Sep. 27, 2013		89,000,000

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Employee Severance and Termination Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 27, 2013 Employees	Sep. 28, 2012	Dec. 31, 2012 Employees
Restructuring And Related Activities [Abstract]
Employee severance and other related termination costs	$ 19	$ 19	$ 23
Number of employees terminated	1,400		1,600
Remaining balance of employee termination costs	$ 8		$ 9

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Description of Business - Additional Information (Detail)	9 Months Ended
	Sep. 27, 2013 Segment
Disclosure Description Of Business Additional Information [Abstract]
Number of segments	4

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Employee Stock-Based Compensation (Tables)

9 Months Ended

Sep. 27, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Weighted Average Assumptions in Valuation Model

The weighted average assumptions used in the valuation model for this grant are presented in the table below.

Expected holding period (in years)	5.6
Expected volatility	26.4	%
Expected dividend yield	3.6	%
Risk-free interest rate	1.0	%

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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	May 31, 2012	Mar. 09, 2010	Jul. 01, 2004
Commitments And Contingencies Disclosure [Abstract]
Kalitta Air damages, minimum	$ 235
Pre-judgment interest in Kalitta Air damages, minimum	240
Total damages sought				315
Punitive damages sought				150
Compensatory damages		$ 48.0	$ 6.7

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Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries

24.  Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries

L-3 Communications is a wholly-owned subsidiary of L-3 Holdings. The debt of L-3 Communications, including the Senior Notes and borrowings under amounts drawn against the Amended and Restated Revolving Credit Facility is guaranteed, on a joint and several, full and unconditional basis, by certain of its domestic subsidiaries (the “Guarantor Subsidiaries”) and, in the case of the Amended and Restated Revolving Credit Facility, by L-3 Holdings. The debt of L-3 Holdings, including the CODES, is guaranteed on a joint and several, full and unconditional basis, by L-3 Communications and the Guarantor Subsidiaries. See Note 10 to the audited consolidated financial statements for the year ended December 31, 2012, included in the Company’s Annual Report on Form 10-K. The foreign subsidiaries and certain domestic subsidiaries of L-3 Communications (the “Non-Guarantor Subsidiaries”) do not guarantee the debt of L-3 Communications or L-3 Holdings. None of the debt of L-3 Communications has been issued by its subsidiaries. There are no restrictions on the payment of dividends from the Guarantor Subsidiaries to L-3 Communications or from L-3 Communications to L-3 Holdings.

Prior to the spin-off of Engility on July 17, 2012, Engility Holdings, Inc., Engility Corporation, International Resources Group Ltd. and LinCom Wireless, Inc. were guarantor subsidiaries. As a result of the spin-off, these entities no longer guarantee the debt of L-3 Communications or L-3 Holdings. Therefore, the results of operations and cash flows of the Engility businesses have been reclassified from guarantor subsidiaries to L-3 Communications as discontinued operations in the following condensed combining financial information.

Under the terms of the indentures governing the Senior Notes, the guarantees of the Senior Notes will automatically and unconditionally be released and discharged: (1) upon the release of all guarantees of all other outstanding indebtedness of L-3 Communications Corporation, or (2) upon the determination that such guarantor is no longer a “domestic subsidiary”. Under the terms of the indenture governing the CODES, the guarantees of the CODES will be automatically and unconditionally released and discharged: (1) upon the release of guarantees of all other outstanding indebtedness of L-3 Holdings and its subsidiaries (other than a foreign subsidiary) or (2) upon the designation of such guarantor as an “excluded subsidiary.” In addition, the guarantees of the Senior Notes and the CODES will unconditionally be released and discharged in the event of a sale or other disposition of all of the assets of any guarantor, by way of merger, consolidation or otherwise, or a sale or other disposition of all of the capital stock of such guarantor.

The following unaudited condensed combining financial information presents the results of operations, financial position and cash flows of: (1) L-3 Holdings, excluding L-3 Communications and its consolidated subsidiaries (the “Parent”), (2) L-3 Communications, excluding its consolidated subsidiaries, (3) the Guarantor Subsidiaries, (4) the Non-Guarantor Subsidiaries, and (5) the eliminations to arrive at the information for L-3 on a consolidated basis.

	L-3 Holdings (Parent)		L-3 Communications		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Balance Sheets:
At September 27, 2013:
Current assets:
Cash and cash equivalents	$	—	$	154	$	1	$	244	$	(22	)	$	377
Billed receivables, net		—		381		480		223		—			1,084
Contracts in process		—		1,053		1,260		378		—			2,691
Other current assets		—		291		149		205		—			645
Total current assets		—		1,879		1,890		1,050		(22	)		4,797
Goodwill		—		2,290		4,285		1,182		—			7,757
Other assets		—		797		517		207		—			1,521
Investment in and amounts due from consolidated subsidiaries		6,444		7,075		3,584		—		(17,103	)		—
Total assets	$	6,444	$	12,041	$	10,276	$	2,439	$	(17,125	)	$	14,075
Current liabilities	$	—	$	852	$	1,038	$	635	$	(22	)	$	2,503
Amounts due to consolidated subsidiaries		—		—		—		310		(310	)		—
Other long-term liabilities		—		1,804		193		115		—			2,112
Long-term debt		689		3,630		—		—		(689	)		3,630
Total liabilities		689		6,286		1,231		1,060		(1,021	)		8,245
L-3 shareholders’ equity		5,755		5,755		9,045		1,379		(16,179	)		5,755
Noncontrolling interests		—		—		—		—		75			75
Total equity		5,755		5,755		9,045		1,379		(16,104	)		5,830
Total liabilities and equity	$	6,444	$	12,041	$	10,276	$	2,439	$	(17,125	)	$	14,075
At December 31, 2012:
Current assets:
Cash and cash equivalents	$	—	$	246	$	—	$	242	$	(139	)	$	349
Billed receivables, net		—		290		441		237		—			968
Contracts in process		—		945		1,351		340		—			2,636
Other current assets		—		248		163		191		—			602
Total current assets		—		1,729		1,955		1,010		(139	)		4,555
Goodwill		—		1,993		4,586		1,197		—			7,776
Other assets		—		734		565		211		—			1,510
Investment in and amounts due from consolidated subsidiaries		6,156		7,208		3,326		43		(16,733	)		—
Total assets	$	6,156	$	11,664	$	10,432	$	2,461	$	(16,872	)	$	13,841
Current liabilities	$	—	$	823	$	1,255	$	652	$	(139	)	$	2,591
Other long-term liabilities		—		1,745		210		123		—			2,078
Long-term debt		689		3,629		—		—		(689	)		3,629
Total liabilities		689		6,197		1,465		775		(828	)		8,298
L-3 shareholders’ equity		5,467		5,467		8,967		1,686		(16,120	)		5,467
Noncontrolling interests		—		—		—		—		76			76
Total equity		5,467		5,467		8,967		1,686		(16,044	)		5,543
Total liabilities and equity	$	6,156	$	11,664	$	10,432	$	2,461	$	(16,872	)	$	13,841

 

	L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Operations:
For the quarter ended September 27, 2013:
Total net sales	$	—		$	913		$	1,636		$	546		$	(99	)	$	2,996
Total cost of sales		(14	)		(855	)		(1,443	)		(483	)		113			(2,682	)
Operating (loss) income		(14	)		58			193			63			14			314
Interest expense		(5	)		(43	)		—			(1	)		5			(44	)
Interest and other income, net		—			2			1			—			—			3
(Loss) income before income taxes		(19	)		17			194			62			19			273
Benefit (provision) for income taxes		5			(3	)		(47	)		(15	)		(5	)		(65	)
Equity in net income of consolidated subsidiaries		218			190			—			—			(408	)		—
Net income		204			204			147			47			(394	)		208
Net income attributable to noncontrolling interests		—			—			—			—			(4	)		(4	)
Net income attributable to L-3	$	204		$	204		$	147		$	47		$	(398	)	$	204
Comprehensive income attributable to L-3	$	254		$	254		$	148		$	79		$	(481	)	$	254
For the quarter ended September 28, 2012:
Total net sales	$	—		$	892		$	1,929		$	550		$	(88	)	$	3,283
Total cost of sales		(15	)		(808	)		(1,743	)		(489	)		103			(2,952	)
Operating (loss) income		(15	)		84			186			61			15			331
Interest expense		(5	)		(48	)		—			—			5			(48	)
Interest and other income, net		—			3			(4	)		1			—			—
Debt retirement charge		—			(8	)		—			—			—			(8	)
(Loss) income from continuing operations before income taxes		(20	)		31			182			62			20			275
Benefit (provision) for income taxes		6			(9	)		(53	)		(18	)		(6	)		(80	)
Equity in net income of consolidated subsidiaries from continuing operations		206			171			—			—			(377	)		—
Income from continuing operations		192			193			129			44			(363	)		195
Loss from discontinued operations, net of income tax		—			(1	)		—			—			—			(1	)
Net income		192			192			129			44			(363	)		194
Net income attributable to noncontrolling interests		—			—			—			—			(2	)		(2	)
Net income attributable to L-3	$	192		$	192		$	129		$	44		$	(365	)	$	192
Comprehensive income attributable to L-3	$	249		$	249		$	129		$	92		$	(470	)	$	249

	L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Operations:
For the year-to-date ended September 27, 2013:
Total net sales	$	—		$	2,841		$	5,089		$	1,711		$	(268	)	$	9,373
Total cost of sales		(42	)		(2,630	)		(4,550	)		(1,527	)		310			(8,439	)
Operating (loss) income		(42	)		211			539			184			42			934
Interest expense		(15	)		(130	)		—			(1	)		15			(131	)
Interest and other income, net		—			6			1			4			—			11
(Loss) income from continuing operations before income taxes		(57	)		87			540			187			57			814
Benefit (provision) for income taxes		16			(24	)		(150	)		(52	)		(16	)		(226	)
Equity in net income of consolidated subsidiaries		623			519			—			—			(1,142	)		—
Net income		582			582			390			135			(1,101	)		588
Net income attributable to noncontrolling interests		—			—			—			—			(6	)		(6	)
Net income attributable to L-3	$	582		$	582		$	390		$	135		$	(1,107	)	$	582
Comprehensive income attributable to L-3	$	603		$	603		$	391		$	112		$	(1,106	)	$	603
For the year-to-date ended September 28, 2012:
Total net sales	$	—		$	2,715		$	5,476		$	1,648		$	(253	)	$	9,586
Total cost of sales		(44	)		(2,475	)		(4,936	)		(1,441	)		297			(8,599	)
Operating (loss) income		(44	)		240			540			207			44			987
Interest expense		(15	)		(138	)		—			—			15			(138	)
Interest and other income, net		—			8			(4	)		2			—			6
Debt retirement charge		—			(8	)		—			—			—			(8	)
(Loss) income from continuing operations before income taxes		(59	)		102			536			209			59			847
Benefit (provision) for income taxes		19			(32	)		(173	)		(69	)		(19	)		(274	)
Equity in net income of consolidated subsidiaries from continuing operations		638			496			—			—			(1,134	)		—
Income from continuing operations		598			566			363			140			(1,094	)		573
Income from discontinued operations, net of income tax		—			32			—			—			—			32
Net income		598			598			363			140			(1,094	)		605
Net income attributable to noncontrolling interests		—			—			—			—			(7	)		(7	)
Net income attributable to L-3	$	598		$	598		$	363		$	140		$	(1,101	)	$	598
Comprehensive income attributable to L-3	$	661		$	661		$	366		$	168		$	(1,195	)	$	661

	L-3 Holdings (Parent)			L-3 Communications			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated L-3
	(in millions)
Condensed Combining Statements of Cash Flows:
For the year-to-date ended September 27, 2013:
Operating activities:
Net cash from operating activities	$	555		$	86		$	523		$	101		$	(648	)	$	617
Investing activities:
Business acquisitions, net of cash acquired		—			(2	)		—			—			—			(2	)
Investments in L-3 Communications		(104	)		—			—			—			104			—
Other investing activities		—			(70	)		(53	)		(16	)		—			(139	)
Net cash used in investing activities		(104	)		(72	)		(53	)		(16	)		104			(141	)
Financing activities:
Common stock repurchased		(404	)		—			—			—			—			(404	)
Dividends paid on L-3 Holdings common stock		(151	)		—			—			—			—			(151	)
Dividends paid to L-3 Holdings		—			(555	)		—			—			555			—
Investments from L-3 Holdings		—			104			—			—			(104	)		—
Other financing activities		104			345			(469	)		(81	)		210			109
Net cash used in financing activities		(451	)		(106	)		(469	)		(81	)		661			(446	)
Effect of foreign currency exchange rate changes on cash		—			—			—			(2	)		—			(2	)
Net (decrease) increase in cash		—			(92	)		1			2			117			28
Cash and cash equivalents, beginning of the period		—			246			—			242			(139	)		349
Cash and cash equivalents, end of the period	$	—		$	154		$	1		$	244		$	(22	)	$	377
For the year-to-date ended September 28, 2012:
Operating activities:
Net cash from operating activities from continuing operations	$	653		$	83		$	527		$	182		$	(753	)	$	692
Investing activities:
Business acquisitions, net of cash acquired		—			(349	)		—			—			—			(349	)
Investments in L-3 Communications		(27	)		—			—			—			27			—
Other investing activities		—			262			(41	)		(9	)		—			212
Net cash used in investing activities from continuing operations		(27	)		(87	)		(41	)		(9	)		27			(137	)
Financing activities:
Redemption of senior subordinated notes		—			(250	)		—			—			—			(250	)
Common stock repurchased		(504	)		—			—			—			—			(504	)
Dividends paid on L-3 Holdings common stock		(149	)		—			—			—			—			(149	)
Dividends paid to L-3 Holdings		—			(653	)		—			—			653			—
Investments from L-3 Holdings		—			27			—			—			(27	)		—
Other financing activities		27			523			(485	)		(182	)		137			20
Net cash used in financing activities from continuing operations		(626	)		(353	)		(485	)		(182	)		763			(883	)
Effect of foreign currency exchange rate changes on cash		—			—			—			4			—			4
Net increase in cash and cash equivalents of discontinued operations		—			74			—			—			—			74
Net (decrease) increase in cash		—			(283	)		1			(5	)		37			(250	)
Cash and cash equivalents, beginning of the period		—			644			—			222			(102	)		764
Cash and cash equivalents, end of the period	$	—		$	361		$	1		$	217		$	(65	)	$	514

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Derivative Financial Instruments - Location of Company's Derivative Instruments Recorded at Fair Value on Condensed Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, assets	$ 6	$ 4
Other Current Assets [Member] | Foreign Currency Forward Contracts [Member] | Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, assets	6	4
Other Current Assets [Member] | Foreign Currency Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, assets
Other Current Assets [Member] | CODES Due 2035 [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, assets
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, assets	2	4
Other Assets [Member] | Foreign Currency Forward Contracts [Member] | Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, assets	2	4
Other Assets [Member] | Foreign Currency Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, assets
Other Assets [Member] | CODES Due 2035 [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, assets
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, liabilities	1	2
Other Current Liabilities [Member] | Foreign Currency Forward Contracts [Member] | Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, liabilities	1	2
Other Current Liabilities [Member] | Foreign Currency Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, liabilities
Other Current Liabilities [Member] | CODES Due 2035 [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, liabilities
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, liabilities	1	1
Other Liabilities [Member] | Foreign Currency Forward Contracts [Member] | Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, liabilities	1	1
Other Liabilities [Member] | Foreign Currency Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, liabilities
Other Liabilities [Member] | CODES Due 2035 [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivative instruments, liabilities

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Segment Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013 Segment	Sep. 28, 2012
Segment Reporting [Abstract]
Number of segments	4
Corporate expenses		$ 10

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Other Current Liabilities and Other Liabilities - Other Current Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Other Current Liabilities:
Accruals for pending and threatened litigation (see Note 17)	$ 5	$ 7
Accrued product warranty costs	76	78
Estimated costs in excess of estimated contract value to complete contracts in process in a loss position	67	72
Accrued interest	46	53
Deferred revenues	38	37
Estimated contingent purchase price payable for acquired businesses		4
Other	151	144
Total other current liabilities	$ 383	$ 395

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Contracts in Process - Selling, General and Administrative Expenses and Research and Development Expenses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Inventory Disclosure [Abstract]
Selling, general and administrative expenses	$ 68	$ 58	$ 212	$ 196
Research and development expenses	17	18	62	63
Total	$ 85	$ 76	$ 274	$ 259

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Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 30	$ 26	$ 95	$ 85
Interest cost	33	34	99	100
Expected return on plan assets	(41)	(37)	(124)	(108)
Amortization of prior service costs (credits)	1	1	1	1
Amortization of net loss	20	17	63	51
Curtailment loss	2	4	2	5
Net periodic benefit cost	45	45	136	134
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	1		3	3
Interest cost	2	2	5	7
Expected return on plan assets			(2)	(2)
Amortization of prior service costs (credits)	(1)	(1)	(2)	(2)
Amortization of net loss			1	1
Curtailment loss
Net periodic benefit cost	$ 2	$ 1	$ 5	$ 7

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Income Taxes

9 Months Ended

Sep. 27, 2013

Income Tax Disclosure [Abstract]

Income Taxes

10.  Income Taxes

The Company and its subsidiaries file income tax returns in the U.S. Federal jurisdiction and various state and foreign jurisdictions. As of September 27, 2013, the statutes of limitations for the Company’s U.S. Federal income tax returns for the years ended December 31, 2010 through 2012 were open. The U.S Internal Revenue Service (IRS) plans to commence an audit of the Company’s 2011 and 2010 U.S. Federal tax returns, the outcome of which cannot be predicted at this time.

The effective tax rate for the year-to-date period ended September 27, 2013 decreased to 27.8% from 32.3% for the year-to-date period ended September 28, 2012. The decrease was primarily due to a tax benefit in the year-to-date period ended September 27, 2013 of $28 million related to the U.S. Federal research and experimentation tax credit (R&E Credit), of which $17 million relates to 2012 and $11 million relates to the year-to-date period ended September 27, 2013. The R&E Credit was retroactively reinstated from January 1, 2012 to December 31, 2013 as part of the American Taxpayer Relief Act of 2012, which was signed into law on January 2, 2013. Accounting standards for income taxes require that the impact for tax law changes be recognized in the period that the law is enacted.

In the third quarter of 2013, the Company reversed previously accrued amounts relating to its provision for income taxes of $10 million for the expiration of the statutes of limitations for several tax returns, including the Company’s 2009 U.S. Federal income tax return as well as certain state and foreign tax returns. As of September 27, 2013, the Company anticipates that unrecognized tax benefits will decrease by approximately $6 million over the next 12 months due to the potential resolution of unrecognized tax benefits involving several jurisdictions and tax periods. The actual amount of the decrease over the next 12 months could vary significantly depending on the ultimate timing and nature of any settlement.

Non-current income taxes payable include accrued potential interest of $10 million ($6 million after income taxes) at September 27, 2013 and $11 million ($6 million after income taxes) at December 31, 2012, and potential penalties of $7 million at September 27, 2013 and $7 million at December 31, 2012.

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Inventories

9 Months Ended

Sep. 27, 2013

Inventory Disclosure [Abstract]

Inventories

6.  Inventories

Inventories at Lower of Cost or Market. The table below presents the components of inventories at the lower of cost (first-in, first-out or average cost) or realizable value.

	September 27, 2013		December 31, 2012
	(in millions)
Raw materials, components and sub-assemblies	$	174	$	168
Work in process		155		124
Finished goods		91		71
Total	$	420	$	363

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Other Current Liabilities and Other Liabilities - Changes in Company's Accrued Product Warranty Costs (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012
Accrued product warranty costs:
Balance at January 1	$ 100	$ 94
Acquisitions during the period		2
Accruals for product warranties issued during the period	56	56
Settlements made during the period	(56)	(58)
Balance at end of period	$ 100	$ 94

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L-3 Holdings' Earnings Per Common Share

9 Months Ended

Sep. 27, 2013

Earnings Per Share [Abstract]

L-3 Holdings' Earnings Per Common Share

13.  L-3 Holdings’ Earnings Per Common Share

A reconciliation of basic and diluted earnings per share (EPS) is presented in the table below.

	Third Quarter Ended						Year-to-Date Ended
	September 27, 2013			September 28, 2012			September 27, 2013			September 28, 2012
	(in millions, except per share data)
Reconciliation of net income:
Net income	$	208		$	194		$	588		$	605
Net income from continuing operations attributable to noncontrolling interests		(4	)		(2	)		(6	)		(3	)
Net income from discontinued operations attributable to noncontrolling interests		—			—			—			(4	)
Net income attributable to L-3 Holdings’ common shareholders	$	204		$	192		$	582		$	598
Earnings (loss) attributable to L-3 Holdings’ common shareholders:
Continuing operations	$	204		$	193		$	582		$	570
Discontinued operations, net of income tax		—			(1	)		—			28
Net income attributable to L-3 Holdings’ common shareholders	$	204		$	192		$	582		$	598
Earnings (loss) per share attributable to L-3 Holdings’ common shareholders:
Basic:
Weighted average common shares outstanding		89.6			96.1			89.9			97.4
Basic earnings (loss) per share:
Continuing operations	$	2.28		$	2.01		$	6.47		$	5.85
Discontinued operations, net of income tax		—			(0.01	)		—			0.29
Basic earnings per share	$	2.28		$	2.00		$	6.47		$	6.14
Diluted:
Common and potential common shares:
Weighted average common shares outstanding		89.6			96.1			89.9			97.4
Assumed exercise of stock options		4.7			2.1			3.9			1.7
Unvested restricted stock awards		1.8			2.0			1.8			2.1
Employee stock purchase plan contributions		0.2			0.3			0.2			0.3
Performance unit awards		0.1			—			0.1			—
Assumed purchase of common shares for treasury		(5.2	)		(3.1	)		(4.7	)		(2.8	)
Assumed conversion of the CODES(1)		0.1			—			0.1			—
Common and potential common shares		91.3			97.4			91.3			98.7
Diluted earnings (loss) per share:
Continuing operations	$	2.23		$	1.98		$	6.37		$	5.78
Discontinued operations, net of income tax		—			(0.01	)		—			0.28
Diluted earnings per share	$	2.23		$	1.97		$	6.37		$	6.06

⁽¹⁾  L-3 Holdings’ CODES had no impact on diluted EPS for the quarterly or year-to-date periods ended September 28, 2012 as the average market price of L-3 Holdings common stock during these periods was less than the price at which the CODES would have been convertible into L-3 Holdings common stock. As of September 27, 2013, the conversion price was $90.24.

The computation of diluted EPS excluded stock options of 3.2 million for the quarterly period ended September 28, 2012, and 1.2 million and 3.5 million for the year-to-date periods ended September 27, 2013 and September 28, 2012, respectively, as they were anti-dilutive.

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Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income

11.  Amounts Reclassified Out of Accumulated Other Comprehensive (Loss) Income

Amounts reclassified out of AOCI for the year-to-date period ended September 27, 2013 are presented in the table below.

	Foreign currency translation			Unrealized gains (losses) on hedging instruments			Unrecognized losses and prior service cost, net			Total accumulated other comprehensive (loss) income
	(in millions)
Balance at December 31, 2012	$	167		$	3		$	(720	)	$	(550	)
Other comprehensive loss before reclassifications, net of tax		(18	)		(2	)		—			(20	)
Amounts reclassified from other comprehensive income, net of tax		—			1			40			41
Net current period other comprehensive (loss) income		(18	)		(1	)		40			21
Balance at September 27, 2013	$	149		$	2		$	(680	)	$	(529	)

Further details regarding the amounts reclassified from AOCI for the quarterly and year-to-date periods ended September 27, 2013 are presented in the table below.

	Amount Reclassified from Accumulated Other Comprehensive (Loss) Income						Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	Third Quarter Ended			Year-to-Date Ended
Details About Accumulated Other Comprehensive (Loss) Income Components	September 27, 2013			September 27, 2013
	(in millions)
Gain on hedging instruments	$	—		$	1		Cost of sales-products
		—			1		Income from continuing operations before income taxes
		—			—		Provision for income taxes
	$	—		$	1		Income from continuing operations
Amortization of defined benefit pension items:
Net loss	$	20		$	63		(a)
		20			63		Income from continuing operations before income taxes
		(7	)		(23	)	Provision for income taxes
	$	13		$	40		Income from continuing operations
Total reclassification for the period	$	13		$	41		Income from continuing operations

^(a)  Amounts related to pension and postretirement benefit plans were reclassified from AOCI and recorded as a component of net periodic benefit cost (see Note 18 for additional information).

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Document and Entity Information	9 Months Ended
	Sep. 27, 2013	Oct. 23, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 27, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Trading Symbol	LLL
Entity Registrant Name	L 3 COMMUNICATIONS HOLDINGS INC
Entity Central Index Key	0001056239
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		88,625,424

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Pension and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013
Pension Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Contribution to pension plans	$ 93
Pension Plans [Member] | Minimum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Expected contributions to plans	13
Pension Plans [Member] | Maximum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Expected contributions to plans	52
Other Postretirement Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Contribution to other postretirement benefit plans	5
Expected contributions to plans	$ 6

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Equity

9 Months Ended

Sep. 27, 2013

Text Block [Abstract]

Equity

12.  Equity

The $1.5 billion share repurchase program authorized on April 26, 2011 by L-3 Holdings’ Board of Directors expired on April 30, 2013. On February 5, 2013, L-3 Holdings’ Board of Directors approved a new share repurchase program that authorizes L-3 Holdings to repurchase up to an additional $1.5 billion of its common stock through June 30, 2015. Repurchases of L-3 Holdings’ common stock under the February 5, 2013 share repurchase program are made at management’s discretion in accordance with applicable U.S. Federal securities laws in the open market or otherwise. The timing and actual number of shares to be repurchased in the future will depend on a variety of factors, including the Company’s financial position, earnings, legal requirements, other investment opportunities (including acquisitions), market conditions and other factors. L-3 Holdings repurchased 4.8 million shares of its common stock at an average price of $84.59 per share for an aggregate amount of $404 million from January 1, 2013 through September 27, 2013. Approximately 2.1 million of the share repurchases, for an aggregate amount of $168 million, were repurchased pursuant to the April 26, 2011 share repurchase program. The remaining share repurchases were made pursuant to the share repurchase program authorized on February 5, 2013. All share repurchases of L-3 Holdings’ common stock have been recorded as treasury shares.

At September 27, 2013, the remaining dollar value of authorization under the February 5, 2013 share repurchase program was $1,264 million. From September 28, 2013 through October 23, 2013, L-3 Holdings repurchased 527,135 shares of its common stock at an average price of $93.88 per share for an aggregate amount of $49 million under the February 5, 2013 share repurchase program.

On June 19, 2013, L-3 Holdings’ Board of Directors declared a cash dividend of $0.55 per share, which resulted in the Company paying total cash dividends of $50 million on September 16, 2013. Also, on October 22, 2013, L-3 Holdings’ Board of Directors declared a quarterly cash dividend of $0.55 per share, payable on December 16, 2013, to shareholders of record at the close of business on November 18, 2013.

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Goodwill and Identifiable Intangible Assets - Changes in Goodwill by Segment (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013
Goodwill [Line Items]
Balance, Beginning	$ 7,776
Business dispositions	(2)
Foreign currency translation adjustments	(17)
Balance, Ending	7,757
C3ISR [Member]
Goodwill [Line Items]
Balance, Beginning	797
Business dispositions
Foreign currency translation adjustments
Balance, Ending	797
Electronic Systems [Member]
Goodwill [Line Items]
Balance, Beginning	4,836
Business dispositions	(2)
Foreign currency translation adjustments	(7)
Balance, Ending	4,827
P&LS [Member]
Goodwill [Line Items]
Balance, Beginning	1,175
Business dispositions
Foreign currency translation adjustments	(10)
Balance, Ending	1,165
NSS [Member]
Goodwill [Line Items]
Balance, Beginning	968
Business dispositions
Foreign currency translation adjustments
Balance, Ending	$ 968

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Inventories - Inventories at Lower of Cost or Market (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw materials, components and sub-assemblies	$ 174	$ 168
Work in process	155	124
Finished goods	91	71
Total	$ 420	$ 363

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Employee Stock-Based Compensation - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 27, 2013
Employee Restricted Equity Awards And Performance Stock Awards Vesting Activity [Line Items]
Stock options granted	741,692
Expiration period of stock options granted from date of grant	10 years
Vesting period	3 years
Weighted average grant date fair value of stock options	$ 12.09
Restricted Stock Units [Member]
Employee Restricted Equity Awards And Performance Stock Awards Vesting Activity [Line Items]
Vesting period	3 years
Units granted	604,982
Weighted average grant date fair value	$ 77.12
Vesting period of units granted for non-employee directors	1 year
Performance Units [Member]
Employee Restricted Equity Awards And Performance Stock Awards Vesting Activity [Line Items]
Units granted	61,690
Weighted average grant date fair value	$ 77.00
Length of service after grant date	3 years
Minimum payout range	0.00%
Maximum payout range	200.00%