BUSINESS SEGMENT INFORMATION - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 29, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenue		$ 5,211	$ 4,471
Segment operating income (loss)		378	393
Non-service FAS pension income and other, net	[1]	88	82
Interest expense, net		(176)	(102)
Income from continuing operations before income taxes		290	373
Pension
Segment Reporting Information [Line Items]
FAS pension service cost		(8)	(6)
Non-service FAS pension income		(74)	(70)
Pension | Plans Under US Government Contracts
Segment Reporting Information [Line Items]
FAS pension service cost		(8)	(6)
Less: CAS pension cost		(15)	(28)
FAS/CAS operating adjustment		7	22
Non-service FAS pension income		80	77
FAS/CAS pension adjustment, net		87	99
Operating segments
Segment Reporting Information [Line Items]
Segment operating income (loss)		788	638
Operating segments | SAS
Segment Reporting Information [Line Items]
Revenue		1,751	1,655
Segment operating income (loss)		216	187
Operating segments | IMS
Segment Reporting Information [Line Items]
Revenue		1,669	1,700
Segment operating income (loss)		190	185
Operating segments | CS
Segment Reporting Information [Line Items]
Revenue		1,294	1,163
Segment operating income (loss)		310	266
Operating segments | AR
Segment Reporting Information [Line Items]
Revenue		542
Segment operating income (loss)		72
Corporate
Segment Reporting Information [Line Items]
Revenue		(45)	(47)
Segment operating income (loss)		$ (410)	$ (245)

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