Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 24, 2016	Jun. 26, 2015	Jun. 24, 2016	Jun. 26, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 151	$ 124	$ 381	$ 233
Other comprehensive income (loss):
Foreign currency translation adjustments		3	58	4	(29)
Unrealized gains on hedging instruments	[1]	3	7	10	4
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized	[2]	8	11	16	22
Net gain arising during the period	[3]		9		9
Total other comprehensive income (loss)		14	85	30	6
Comprehensive income		165	209	411	239
Comprehensive income attributable to noncontrolling interests		(4)	(4)	(7)	(8)
Comprehensive income attributable to L-3		$ 161	$ 205	$ 404	$ 231

[1] Net of income taxes of $1 million and $2 million for the quarterly periods ended June 24, 2016 and June 26, 2015, respectively, and income taxes of $4 million and $1 million for the first half periods ended June 24, 2016 and June 26, 2015, respectively.

[2] Net of income taxes of $5 million for each of the quarterly periods ended June 24, 2016 and June 26, 2015, and income taxes of $9 million and $11 million for the first half periods ended June 24, 2016 and June 26, 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. Amounts are net of income taxes of $5 million for each of the quarterly and first half periods ended June 26, 2015.