UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 24, 2016	Jun. 30, 2017	Jun. 24, 2016
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income		$ 207	$ 151	$ 375	$ 381
Other comprehensive income:
Foreign currency translation adjustments		52	3	71	4
Unrealized gains on hedging instruments	[1]	0	3	0	10
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized	[2]	10	8	19	16
Total other comprehensive income		62	14	90	30
Comprehensive income		269	165	465	411
Comprehensive income attributable to noncontrolling interests		(5)	(4)	(9)	(7)
Comprehensive income attributable to L3		$ 264	$ 161	$ 456	$ 404

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

[2] Net of income taxes of $5 million for each of the quarterly periods ended June 30, 2017 and June 24, 2016 and net of income taxes of $11 million and $9 million for the first half periods ended June 30, 2017 and June 24, 2016, respectively.