INFORMATION ON BUSINESS SEGMENTS - Schedule of Financial Information for Each Business Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2026	Mar. 30, 2025
Sales
Total sales	$ 18,021	$ 17,963
Operating costs and expenses
Total operating costs and expenses	15,943	15,640
Operating profit
Total business segment operating profit	2,063	2,372
Operating Segments
Sales
Total sales	18,021	17,963
Operating costs and expenses
Total operating costs and expenses	16,182	15,924
Operating profit
Total business segment operating profit	1,823	2,085
Unallocated items
Unallocated items
FAS/CAS pension operating adjustment	421	379
Intangible asset amortization expense	(50)	(64)
Other, net	(131)	(28)
Total unallocated items	240	287
Intersegment sales
Sales
Total sales	(1,007)	(905)
Aeronautics | Operating Segments
Sales
Total sales	6,953	7,057
Operating costs and expenses
Total operating costs and expenses	6,334	6,337
Operating profit
Total business segment operating profit	619	720
Aeronautics | Intersegment sales
Sales
Total sales	(93)	(89)
MFC | Operating Segments
Sales
Total sales	3,649	3,373
Operating costs and expenses
Total operating costs and expenses	3,150	2,908
Operating profit
Total business segment operating profit	500	465
MFC | Intersegment sales
Sales
Total sales	(238)	(169)
RMS | Operating Segments
Sales
Total sales	3,991	4,328
Operating costs and expenses
Total operating costs and expenses	3,559	3,858
Operating profit
Total business segment operating profit	423	521
RMS | Intersegment sales
Sales
Total sales	(595)	(564)
Space | Operating Segments
Sales
Total sales	3,428	3,205
Operating costs and expenses
Total operating costs and expenses	3,139	2,821
Operating profit
Total business segment operating profit	281	379
Space | Intersegment sales
Sales
Total sales	$ (81)	$ (83)