CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,198	$ 1,061	$ 1,842
Other comprehensive income (loss):
Foreign currency translation income (loss), net of income taxes	36	(119)	(63)
Net unrealized income (loss) on hedging derivatives, net of income taxes	10	(8)	(3)
Net unrecognized gains (losses) on postretirement obligations, net of income taxes	71	(26)	758
Other comprehensive income (loss), recognized during the period	117	(153)	692
Reclassification adjustments for (gains) losses included in net income	(27)	11	1
Other comprehensive income (loss), net of income taxes	90	(142)	693
Total comprehensive income	1,288	919	2,535
Comprehensive loss attributable to noncontrolling interest	29	1	4
Total comprehensive income attributable to L3Harris Technologies, Inc.	$ 1,317	$ 920	$ 2,539