BUSINESS SEGMENT INFORMATION - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Revenue from Product Sales and Services
Revenue from product sales and services	$ 4,915	$ 4,246	$ 14,079	$ 12,484
Unallocated Items:
Unallocated corporate department (expense) income, net	(828)	(742)	(2,384)	(2,239)
Amortization of acquisition-related intangibles	(208)	(151)	(546)	(454)
Sale of asset group and business divestiture-related gains, net	0	0	26	8
Non-operating income, net	80	99	245	313
Interest expense, net	(159)	(70)	(372)	(205)
Income (loss) before income taxes	400	(321)	1,145	740
Contract-Based Intangible Assets
Unallocated Items:
Impairment of goodwill and other assets			(18)
In-process research and development | Discontinued Operations, Disposed of by Means Other than Sale, Abandonment | Open Water Power Facility
Unallocated Items:
Impairment of goodwill and other assets	(21)		(21)
Pension
Unallocated Items:
FAS pension service cost	(10)	(10)	(22)	(32)
Non-service FAS pension income	(71)	(106)	(211)	(317)
Pension | Plans Under US Government Contracts
Unallocated Items:
FAS/CAS operating adjustment	27	22	72	65
FAS pension service cost	(10)	(11)	(23)	(34)
Less: CAS pension cost	(37)	(33)	(95)	(99)
FAS/CAS operating adjustment	27	22	72	65
Non-service FAS pension income	78	111	232	332
FAS/CAS pension adjustment, net	105	133	304	397
SAS
Unallocated Items:
Other asset impairment charges	(27)
IMS
Unallocated Items:
Other asset impairment charges	(12)
Operating segments
Income (loss) before Income Taxes
Segment operating income (loss)	735	(148)	2,028	1,157
Unallocated Items:
Total unallocated items	735	(148)	2,028	1,157
Operating segments | SAS
Revenue from Product Sales and Services
Revenue from product sales and services	1,686	1,593	5,056	4,682
Income (loss) before Income Taxes
Segment operating income (loss)	210	92	565	472
Unallocated Items:
Total unallocated items	210	92	565	472
Operating segments | IMS
Revenue from Product Sales and Services
Revenue from product sales and services	1,568	1,630	5,003	4,897
Income (loss) before Income Taxes
Segment operating income (loss)	187	(143)	534	315
Unallocated Items:
Total unallocated items	187	(143)	534	315
Operating segments | CS
Revenue from Product Sales and Services
Revenue from product sales and services	1,255	1,068	3,707	3,024
Income (loss) before Income Taxes
Segment operating income (loss)	282	(97)	873	370
Unallocated Items:
Total unallocated items	282	(97)	873	370
Operating segments | AR
Revenue from Product Sales and Services
Revenue from product sales and services	455		455
Income (loss) before Income Taxes
Segment operating income (loss)	56		56
Unallocated Items:
Total unallocated items	56		56
Corporate
Revenue from Product Sales and Services
Revenue from product sales and services	(49)	(45)	(142)	(119)
Income (loss) before Income Taxes
Segment operating income (loss)	(256)	(202)	(756)	(525)
Unallocated Items:
Unallocated corporate department (expense) income, net	14	18	(27)	33
Amortization of acquisition-related intangibles	(208)	(151)	(546)	(454)
Additional cost of sales related to the fair value step-up in inventory sold	0	0	(30)	0
Merger, acquisition, and divestiture related expenses	(56)	(31)	(144)	(117)
Sale of asset group and business divestiture-related gains, net	0	0	26	8
Impairment of goodwill and other assets	0	0	(39)	0
LHX NeXt	(33)	0	(68)	0
Charges for severance and other termination costs	0	(29)	0	(29)
Charge related to an additional pre-merger legal contingency	0	(31)	0	(31)
FAS/CAS operating adjustment	27	22	72	65
Total unallocated items	(256)	(202)	(756)	(525)
FAS/CAS operating adjustment	$ 27	$ 22	$ 72	$ 65