CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jan. 03, 2020	Jun. 28, 2019	Jun. 29, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 834	$ 949	$ 699	$ 543
Other comprehensive income (loss):
Foreign currency translation gain (loss), net of income taxes	25	(7)	15	(34)
Net unrealized gain (loss) on hedging derivatives, net of income taxes	(17)	(18)	1	1
Net unrecognized gain (loss) on postretirement obligations, net of income taxes	178	(480)	93	200
Other comprehensive income (loss), net of income taxes	186	(505)	109	167
Total comprehensive income	1,020	444	808	710
Comprehensive income attributable to noncontrolling interests	(12)	0	0	0
Total comprehensive income attributable to L3Harris Technologies, Inc.	$ 1,008	$ 444	$ 808	$ 710