Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income		$ (296)	$ 157	$ (63)	$ 470
Other comprehensive income (loss):
Foreign currency translation adjustments		(55)	(63)	(84)	(57)
Unrealized losses on hedging instruments	[1]	(7)	(3)	(3)
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized	[2]	10	2	32	7
Net gain arising during the period	[3]			9
Total other comprehensive (loss) income		(52)	(64)	(46)	(50)
Comprehensive (loss) income		(348)	93	(109)	420
Comprehensive income attributable to noncontrolling interests		(3)	(3)	(11)	(9)
Comprehensive (loss) income attributable to L-3		$ (351)	$ 90	$ (120)	$ 411

[1] Amounts are net of income tax benefits of $3 million and $1 million for the quarterly periods ended September 25, 2015 and September 26, 2014, respectively, and income tax benefits of $2 million for the year-to-date period ended September 25, 2015.

[2] Amounts are net of income taxes of $7 million and $1 million for the quarterly periods ended September 25, 2015 and September 26, 2014, respectively, and income taxes of $18 million and $4 million for the year-to-date periods ended September 25, 2015 and September 26, 2014, respectively.

[3] Represents the reclassification of actuarial losses into net income related to the Marine Systems International business divestiture in accordance with Accounting Standards Codification 715 Defined Benefit Plans - Pension. Amounts are net of income taxes of $5 million for the year-to-date period ended September 25, 2015.