UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended
		Mar. 29, 2019	Mar. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income		$ 223	$ 208
Other comprehensive income:
Foreign currency translation adjustments		23	33
Unrealized losses on hedging instruments (1)	[1]	(6)
Unrealized losses on hedging instruments (1)	[1]		(1)
Pension and postretirement benefit plans:
Amortization of net loss and prior service cost previously recognized (2)	[2]	7	14
Total other comprehensive income		24	46
Comprehensive income		247	254
Comprehensive income attributable to noncontrolling interests		(6)	(5)
Comprehensive income attributable to L3		241	249
Income tax (expense) on amortization of net loss and prior service cost previously recognized		$ 2	$ 4

[1] Net of income tax benefits of $2 million for the quarterly period ended March 29, 2019.

[2] Net of income taxes of $2 million and $4 million for the quarterly periods ended March 29, 2019 and March 30, 2018, respectively.