INFORMATION ON BUSINESS SEGMENTS - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Sales
Net sales	$ 18,609	$ 17,104	$ 54,727	$ 52,421
United States
Sales
Net sales	13,430	12,766	39,710	39,209
Europe
Sales
Net sales	2,011	1,708	6,065	5,231
Asia Pacific
Sales
Net sales	2,003	1,503	5,604	4,552
Middle East
Sales
Net sales	633	729	2,094	2,313
Other
Sales
Net sales	532	398	1,254	1,116
U.S. Government
Sales
Net sales	13,371	12,685	39,491	38,808
International
Sales
Net sales	5,179	4,338	15,017	13,212
U.S. commercial and other
Sales
Net sales	59	81	219	401
Fixed-price
Sales
Net sales	11,007	10,043	32,328	30,806
Cost-reimbursable
Sales
Net sales	7,602	7,061	22,399	21,615
Products
Sales
Net sales	15,311	14,472	45,396	43,777
Services
Sales
Net sales	3,298	2,632	9,331	8,644
Aeronautics
Sales
Net sales	7,256	6,487	21,733	20,609
Aeronautics | United States
Sales
Net sales	4,685	4,514	13,991	14,187
Aeronautics | Europe
Sales
Net sales	1,245	1,047	3,896	3,528
Aeronautics | Asia Pacific
Sales
Net sales	926	612	2,750	1,933
Aeronautics | Middle East
Sales
Net sales	138	206	445	603
Aeronautics | Other
Sales
Net sales	262	108	651	358
Aeronautics | U.S. Government
Sales
Net sales	4,681	4,465	13,969	14,072
Aeronautics | International
Sales
Net sales	2,571	1,973	7,742	6,422
Aeronautics | U.S. commercial and other
Sales
Net sales	4	49	22	115
Aeronautics | Fixed-price
Sales
Net sales	4,758	4,276	14,383	13,805
Aeronautics | Cost-reimbursable
Sales
Net sales	2,498	2,211	7,350	6,804
Aeronautics | Products
Sales
Net sales	5,807	5,550	17,513	17,113
Aeronautics | Services
Sales
Net sales	1,449	937	4,220	3,496
MFC
Sales
Net sales	3,624	3,175	10,430	9,270
MFC | United States
Sales
Net sales	2,635	2,274	7,473	6,689
MFC | Europe
Sales
Net sales	401	334	1,177	788
MFC | Asia Pacific
Sales
Net sales	281	216	728	583
MFC | Middle East
Sales
Net sales	295	333	1,012	1,153
MFC | Other
Sales
Net sales	12	18	40	57
MFC | U.S. Government
Sales
Net sales	2,633	2,272	7,464	6,680
MFC | International
Sales
Net sales	989	901	2,957	2,581
MFC | U.S. commercial and other
Sales
Net sales	2	2	9	9
MFC | Fixed-price
Sales
Net sales	2,638	2,211	7,525	6,331
MFC | Cost-reimbursable
Sales
Net sales	986	964	2,905	2,939
MFC | Products
Sales
Net sales	3,256	2,811	9,338	8,217
MFC | Services
Sales
Net sales	368	364	1,092	1,053
RMS
Sales
Net sales	4,373	4,367	12,696	13,003
RMS | United States
Sales
Net sales	2,809	2,964	8,579	8,968
RMS | Europe
Sales
Net sales	343	309	926	860
RMS | Asia Pacific
Sales
Net sales	764	632	1,998	1,922
RMS | Middle East
Sales
Net sales	199	190	630	552
RMS | Other
Sales
Net sales	258	272	563	701
RMS | U.S. Government
Sales
Net sales	2,764	2,867	8,409	8,706
RMS | International
Sales
Net sales	1,564	1,403	4,117	4,035
RMS | U.S. commercial and other
Sales
Net sales	45	97	170	262
RMS | Fixed-price
Sales
Net sales	2,733	2,691	7,688	7,980
RMS | Cost-reimbursable
Sales
Net sales	1,640	1,676	5,008	5,023
RMS | Products
Sales
Net sales	3,509	3,554	10,337	10,500
RMS | Services
Sales
Net sales	864	813	2,359	2,503
Space
Sales
Net sales	3,356	3,075	9,868	9,539
Space | United States
Sales
Net sales	3,301	3,014	9,667	9,365
Space | Europe
Sales
Net sales	22	18	66	55
Space | Asia Pacific
Sales
Net sales	32	43	128	114
Space | Middle East
Sales
Net sales	1	0	7	5
Space | Other
Sales
Net sales	0	0	0	0
Space | U.S. Government
Sales
Net sales	3,293	3,081	9,649	9,350
Space | International
Sales
Net sales	55	61	201	174
Space | U.S. commercial and other
Sales
Net sales	8	(67)	18	15
Space | Fixed-price
Sales
Net sales	878	865	2,732	2,690
Space | Cost-reimbursable
Sales
Net sales	2,478	2,210	7,136	6,849
Space | Products
Sales
Net sales	2,739	2,557	8,208	7,947
Space | Services
Sales
Net sales	$ 617	$ 518	$ 1,660	$ 1,592