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Business Segment Information - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Segment Reporting Information [Line Items]
Revenue	$ 4,668	$ 4,445	$ 9,235	$ 9,071
Income From Continuing Operations Before Income Taxes
L3Harris Merger-related integration expenses	(20)	(37)	(41)	(68)
Amortization of acquisition-related intangibles	(156)	(208)	(320)	(353)
Business divestiture-related gains (losses)	180	(49)	165	(52)
Impairment of goodwill and other assets	(63)	(14)	(125)	(19)
Pension adjustment	(114)	(98)	(225)	(195)
Non-operating income	86	105	203	200
Interest expense, net	(65)	(65)	(131)	(128)
Income from continuing operations before income taxes	582	336	1,109	557
L3Harris
Income From Continuing Operations Before Income Taxes
L3Harris Merger-related integration expenses	(20)	(37)	(41)	(68)
Amortization of acquisition-related intangibles	(131)	(183)	(271)	(303)
Additional cost of sales related to fair value step-up in inventory sold	0	16	0	31
Restructuring charges	0	7	0	7
Exelis
Income From Continuing Operations Before Income Taxes
Amortization of acquisition-related intangibles	(25)	(25)	(49)	(50)
Operating segments | Integrated Mission Systems
Segment Reporting Information [Line Items]
Revenue	1,494	1,331	2,945	2,701
Income From Continuing Operations Before Income Taxes
Segment operating income	229	224	469	425
Operating segments | Space and Airborne Systems
Segment Reporting Information [Line Items]
Revenue	1,287	1,249	2,523	2,441
Income From Continuing Operations Before Income Taxes
Segment operating income	253	235	493	456
Operating segments | Communication Systems
Segment Reporting Information [Line Items]
Revenue	1,127	1,112	2,239	2,206
Income From Continuing Operations Before Income Taxes
Segment operating income	287	265	568	515
Operating segments | Aviation Systems
Segment Reporting Information [Line Items]
Revenue	809	800	1,623	1,811
Income From Continuing Operations Before Income Taxes
Segment operating income	35	31	163	(146)
Corporate eliminations
Segment Reporting Information [Line Items]
Revenue	(49)	(47)	(95)	(88)
Other unallocated corporate expenses
Income From Continuing Operations Before Income Taxes
Segment operating income	(70)	(53)	(110)	(78)
Divestiture-related expenses	$ 46	9	$ 53	9
Additional cost of sales related to fair value step-up in inventory sold		16		31
Restructuring charges		$ 7		$ 7

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