UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 25, 2016
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income		$ 168	$ 230
Other comprehensive income:
Foreign currency translation adjustments		19	1
Unrealized gains on hedging instruments	[1]	0	7
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized	[2]	9	8
Total other comprehensive income		28	16
Comprehensive income		196	246
Comprehensive income attributable to noncontrolling interests		(4)	(3)
Comprehensive income attributable to L3		$ 192	$ 243

[1] Net of income taxes of $3 million for the quarterly period ended March 25, 2016.

[2] Net of income taxes of $6 million and $4 million for the quarterly periods ended March 31, 2017 and March 25, 2016, respectively.