UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 29, 2017	Sep. 23, 2016	Sep. 29, 2017	Sep. 23, 2016
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income		$ 25	$ 151	$ 400	$ 532
Other comprehensive income (loss):
Foreign currency translation adjustments		49	(31)	120	(27)
Unrealized gains on hedging instruments	[1]	6	0	6	10
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized	[2]	8	8	27	24
Total other comprehensive income (loss)		63	(23)	153	7
Comprehensive income		88	128	553	539
Comprehensive income attributable to noncontrolling interests		(3)	(3)	(12)	(10)
Comprehensive income attributable to L3		$ 85	$ 125	$ 541	$ 529

[1] Net of income taxes of $2 million for the quarterly period ended September 29, 2017, and net of income taxes of $2 million and $4 million for the year-to-date periods ended September 29, 2017 and September 23, 2016, respectively.

[2] Net of income taxes of $5 million and $4 million for the quarterly periods ended September 29, 2017 and September 23, 2016, respectively, and net of income taxes of $16 million and $13 million for the year-to-date periods ended September 29, 2017 and September 23, 2016, respectively.