CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2020	Mar. 29, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 194	$ 243
Other comprehensive loss:
Foreign currency translation gain (loss), net of income taxes	(67)	3
Net unrealized loss on hedging derivatives, net of income taxes	(73)	(8)
Net unrecognized loss on postretirement obligations, net of income taxes	(1)	(1)
Other comprehensive loss, net of income taxes	(141)	(6)
Total comprehensive income	53	237
Comprehensive loss attributable to noncontrolling interests	23	0
Total comprehensive income attributable to L3Harris Technologies, Inc.	$ 76	$ 237