BUSINESS SEGMENT INFORMATION - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 28, 2024	Jun. 30, 2023	Jun. 28, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenue		$ 5,299	$ 4,693	$ 10,510	$ 9,164
Segment operating income (loss)		476	400	854	793
Non-service FAS pension income and other, net	[1]	86	83	174	165
Interest expense, net		(172)	(111)	(348)	(213)
Income before income taxes		390	372	680	745
Pension
Segment Reporting Information [Line Items]
FAS pension service cost		(9)	(6)	(17)	(12)
Non-service FAS pension income		(74)	(70)	(148)	(140)
Pension | Plans Under US Government Contracts
Segment Reporting Information [Line Items]
FAS pension service cost		(10)	(7)	(18)	(13)
Less: CAS pension cost		(16)	(30)	(31)	(58)
FAS/CAS operating adjustment		6	23	13	45
Non-service FAS pension income		81	77	161	154
FAS/CAS pension adjustment, net		87	100	174	199
Operating segments
Segment Reporting Information [Line Items]
Segment operating income (loss)		825	655	1,613	1,293
Operating segments | SAS
Segment Reporting Information [Line Items]
Revenue		1,707	1,715	3,458	3,370
Segment operating income (loss)		215	168	431	355
Operating segments | IMS
Segment Reporting Information [Line Items]
Revenue		1,729	1,735	3,398	3,435
Segment operating income (loss)		206	162	396	347
Operating segments | CS
Segment Reporting Information [Line Items]
Revenue		1,346	1,289	2,640	2,452
Segment operating income (loss)		329	325	639	591
Operating segments | AR
Segment Reporting Information [Line Items]
Revenue		581		1,123
Segment operating income (loss)		75		147
Intersegment
Segment Reporting Information [Line Items]
Revenue		(64)	(46)	(109)	(93)
Intersegment | SAS
Segment Reporting Information [Line Items]
Revenue		(13)	(10)	(28)	(23)
Intersegment | IMS
Segment Reporting Information [Line Items]
Revenue		(29)	(24)	(45)	(45)
Intersegment | CS
Segment Reporting Information [Line Items]
Revenue		(22)	(12)	(36)	(25)
Intersegment | AR
Segment Reporting Information [Line Items]
Revenue		0		0
Corporate
Segment Reporting Information [Line Items]
Segment operating income (loss)		$ (349)	$ (255)	$ (759)	$ (500)

[1] “FAS” is defined as Financial Accounting Standards.