BUSINESS SEGMENT INFORMATION - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
Revenue from Product Sales and Services
Revenue from product sales and services	$ 4,693	$ 4,135	$ 9,164	$ 8,238
Unallocated Items:
Unallocated corporate department (expense) income, net	(35)	19	(41)	15
Amortization of acquisition-related intangibles	(173)	(151)	(338)	(303)
Additional cost of sales related to the fair value step-up in inventory sold	(15)	0	(30)	0
L3Harris merger-related integration expenses	0	(26)	0	(50)
Acquisition-related transaction and integration expenses	(36)	0	(76)	0
Pre-acquisition and other divestiture-related expenses	(2)	(35)	(12)	(36)
Business divestiture-related gains, net	26	0	26	0
Gain on sale of asset group	0	8	0	8
Impairment of other assets	(21)	0	(39)	0
LHX NeXt	(22)	0	(35)	0
FAS/CAS operating adjustment	23	21	45	43
Total unallocated items	(255)	(164)	(500)	(323)
Non-operating income, net	83	108	165	214
Interest expense, net	(111)	(67)	(213)	(135)
Income before income taxes	372	525	745	1,061
FAS/CAS operating adjustment	23	21	45	43
Contract-Based Intangible Assets
Unallocated Items:
Impairment of other assets			(18)
Pension
Unallocated Items:
FAS pension service cost	(6)	(12)	(12)	(22)
Non-service FAS pension income	(70)	(106)	(140)	(211)
Pension | Plans Under US Government Contracts
Unallocated Items:
FAS/CAS operating adjustment	23	21	45	43
FAS pension service cost	(7)	(12)	(13)	(23)
Less: CAS pension cost	(30)	(33)	(58)	(66)
FAS/CAS operating adjustment	23	21	45	43
Non-service FAS pension income	77	111	154	221
FAS/CAS pension adjustment, net	100	132	199	264
IMS
Revenue from Product Sales and Services
Revenue from product sales and services	1,735	1,608	3,435	3,267
Unallocated Items:
Other asset impairment charges	(12)
SAS
Revenue from Product Sales and Services
Revenue from product sales and services	1,715	1,572	3,370	3,089
Unallocated Items:
Other asset impairment charges	(27)
CS
Revenue from Product Sales and Services
Revenue from product sales and services	1,289	993	2,452	1,956
Operating segments
Income before Income Taxes
Segment Operating Income (Loss)	655	648	1,293	1,305
Operating segments | IMS
Revenue from Product Sales and Services
Revenue from product sales and services	1,735	1,608	3,435	3,267
Income before Income Taxes
Segment Operating Income (Loss)	162	207	347	458
Operating segments | SAS
Revenue from Product Sales and Services
Revenue from product sales and services	1,715	1,572	3,370	3,089
Income before Income Taxes
Segment Operating Income (Loss)	168	203	355	380
Operating segments | CS
Revenue from Product Sales and Services
Revenue from product sales and services	1,289	993	2,452	1,956
Income before Income Taxes
Segment Operating Income (Loss)	325	238	591	467
Corporate
Revenue from Product Sales and Services
Revenue from product sales and services	$ (46)	$ (38)	$ (93)	$ (74)