CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2026	Jan. 03, 2025	Dec. 29, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 1,606	$ 1,512	$ 1,198
Other comprehensive income, net of tax:
Foreign currency translation and other, net	97	(65)	50
Pension and other postretirement benefits	(5)	290	40
Other comprehensive income	92	225	90
Comprehensive income	1,698	1,737	1,288
Noncontrolling interests, net of tax	0	(10)	29
Comprehensive income attributable to L3Harris	$ 1,698	$ 1,727	$ 1,317