Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 23, 2016	Sep. 25, 2015	Sep. 23, 2016	Sep. 25, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 151	$ (296)	$ 532	$ (63)
Other comprehensive income (loss):
Foreign currency translation adjustments		(31)	(55)	(27)	(84)
Unrealized (losses) gains on hedging instruments	[1]		(7)	10	(3)
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized	[2]	8	10	24	32
Net gain arising during the period	[3]				9
Total other comprehensive (loss) income		(23)	(52)	7	(46)
Comprehensive income (loss)		128	(348)	539	(109)
Comprehensive income attributable to noncontrolling interests		(3)	(3)	(10)	(11)
Comprehensive income (loss) attributable to L-3		$ 125	$ (351)	$ 529	$ (120)

[1] Net of income tax benefits of $3 million for the quarterly period ended September 25, 2015, and income taxes of $4 million and income tax benefits of $2 million for the year-to-date periods ended September 23, 2016 and September 25, 2015, respectively.

[2] Net of income taxes of $4 million and $7 million for the quarterly periods ended September 23, 2016 and September 25, 2015, respectively, and income taxes of $13 million and $18 million for the year-to-date periods ended September 23, 2016 and September 25, 2015, 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. Amount is net of income taxes of $5 million for the year-to-date period ended September 25, 2015.