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Business Segment Information - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Segment Reporting Information [Line Items]
Revenue	$ 4,229	$ 4,463	$ 13,464	$ 13,534
Unallocated Items:
L3Harris Merger-related integration expenses	(34)	(27)	(75)	(95)
Amortization of acquisition-related intangibles	(155)	(176)	(475)	(529)
Additional cost of sales related to fair value step-up in inventory sold	0	0	0	(31)
Business divestiture-related gains (losses)	27	(10)	192	(62)
Other items	(8)	(2)	(61)	(19)
Impairment of goodwill and other assets	0	0	(125)	(19)
Unallocated corporate department expense	(2)	(21)	(59)	(51)
Total unallocated expenses	(172)	(236)	(603)	(806)
Pension adjustment	(111)	(97)	(336)	(292)
Non-operating income, net	111	96	314	296
Interest expense, net	(67)	(62)	(198)	(190)
Income from continuing operations before income taxes	586	518	1,695	1,075
Operating segments
Income From Continuing Operations Before Income Taxes
Segment operating income (loss)	825	817	2,518	2,067
Operating segments | Integrated Mission Systems
Segment Reporting Information [Line Items]
Revenue	1,336	1,372	4,281	4,073
Income From Continuing Operations Before Income Taxes
Segment operating income (loss)	222	213	691	638
Operating segments | Space and Airborne Systems
Segment Reporting Information [Line Items]
Revenue	1,284	1,249	3,807	3,690
Income From Continuing Operations Before Income Taxes
Segment operating income (loss)	242	231	735	687
Operating segments | Communication Systems
Segment Reporting Information [Line Items]
Revenue	1,030	1,094	3,269	3,300
Income From Continuing Operations Before Income Taxes
Segment operating income (loss)	271	273	839	788
Operating segments | Aviation Systems
Segment Reporting Information [Line Items]
Revenue	625	792	2,248	2,603
Income From Continuing Operations Before Income Taxes
Segment operating income (loss)	90	100	253	(46)
Corporate eliminations
Segment Reporting Information [Line Items]
Revenue	$ (46)	$ (44)	$ (141)	$ (132)

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