BUSINESS SEGMENT INFORMATION - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Segment Reporting Information [Line Items]
Revenue		$ 5,292	$ 4,915	$ 15,802	$ 14,079
Segment operating income (loss)		495	479	1,349	1,272
Non-service FAS pension income and other, net	[1]	101	80	275	245
Interest expense, net		(166)	(159)	(514)	(372)
Income before income taxes		430	400	1,110	1,145
Pension
Segment Reporting Information [Line Items]
FAS pension service cost		(8)	(10)	(25)	(22)
Pension | Plans Under US Government Contracts
Segment Reporting Information [Line Items]
FAS pension service cost		(8)	(10)	(26)	(23)
Less: CAS pension cost		(15)	(37)	(46)	(95)
FAS/CAS operating adjustment		7	27	20	72
Operating segments
Segment Reporting Information [Line Items]
Segment operating income (loss)		833	735	2,446	2,028
Operating segments | SAS
Segment Reporting Information [Line Items]
Revenue		1,683	1,686	5,141	5,056
Segment operating income (loss)		195	210	626	565
Operating segments | IMS
Segment Reporting Information [Line Items]
Revenue		1,671	1,568	5,069	5,003
Segment operating income (loss)		204	187	600	534
Operating segments | CS
Segment Reporting Information [Line Items]
Revenue		1,382	1,255	4,022	3,707
Segment operating income (loss)		359	282	998	873
Operating segments | AR
Segment Reporting Information [Line Items]
Revenue		596	455	1,719	455
Segment operating income (loss)		75	56	222	56
Intersegment
Segment Reporting Information [Line Items]
Revenue		(40)	(49)	(149)	(142)
Intersegment | SAS
Segment Reporting Information [Line Items]
Revenue		(12)	(13)	(40)	(36)
Intersegment | IMS
Segment Reporting Information [Line Items]
Revenue		(11)	(21)	(56)	(66)
Intersegment | CS
Segment Reporting Information [Line Items]
Revenue		(17)	(15)	(53)	(40)
Intersegment | AR
Segment Reporting Information [Line Items]
Revenue		0	0	0	0
Corporate
Segment Reporting Information [Line Items]
Segment operating income (loss)		$ (338)	$ (256)	$ (1,097)	$ (756)

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