BUSINESS SEGMENT INFORMATION - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Segment Reporting Information [Line Items]
Revenue from product sales and services	$ 4,135	$ 4,668	$ 8,238	$ 9,235
Unallocated Items:
Unallocated corporate department income (expense), net(1)	17	(23)	14	(54)
L3Harris Merger-related transaction, integration and other expenses and losses	(26)	(21)	(49)	(44)
Amortization of acquisition-related intangibles	(151)	(156)	(303)	(320)
Business divestiture-related gains, net	0	180	0	165
Impairment of goodwill and other assets	0	(63)	0	(125)
Gain on sale of asset group	8	0	8	0
Other divestiture-related expenses	(35)	(49)	(37)	(56)
FAS/CAS operating adjustment	21	30	43	60
Total unallocated expenses	(166)	(102)	(324)	(374)
Non-operating income	108	86	214	203
Net interest expense	(67)	(65)	(135)	(131)
Income from continuing operations before income taxes	525	582	1,061	1,109
Accrual for value added tax obligation				15
FAS pension service cost	(12)	(18)	(23)	(37)
Less: CAS pension cost	(33)	(48)	(66)	(97)
FAS/CAS operating adjustment	21	30	43	60
Non-service FAS pension income	111	111	221	222
Net FAS/CAS pension adjustment	132	141	264	282
Pension
Unallocated Items:
Income (loss) from deferred compensation plans	10	(8)	10	(8)
Intellectual Property
Unallocated Items:
Income from sale of intellectual property	7		7
Operating segments
Income from Continuing Operations before Income Taxes
Segment Operating Income:	650	663	1,306	1,411
Operating segments | Integrated Mission Systems
Segment Reporting Information [Line Items]
Revenue from product sales and services	1,673	1,792	3,394	3,543
Income from Continuing Operations before Income Taxes
Segment Operating Income:	217	142	472	376
Operating segments | Space & Airborne Systems
Segment Reporting Information [Line Items]
Revenue from product sales and services	1,498	1,510	2,948	2,970
Income from Continuing Operations before Income Taxes
Segment Operating Income:	195	204	367	396
Operating segments | Communication Systems
Segment Reporting Information [Line Items]
Revenue from product sales and services	993	1,127	1,956	2,239
Income from Continuing Operations before Income Taxes
Segment Operating Income:	238	276	467	546
Other non-reportable businesses
Segment Reporting Information [Line Items]
Revenue from product sales and services	0	282	0	566
Income from Continuing Operations before Income Taxes
Segment Operating Income:	0	41	0	93
Corporate
Segment Reporting Information [Line Items]
Revenue from product sales and services	$ (29)	$ (43)	$ (60)	$ (83)