INFORMATION ON BUSINESS SEGMENTS - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 25, 2023	Jun. 30, 2024	Jun. 25, 2023
Net sales
Net sales	$ 18,122	$ 16,693	$ 35,317	$ 31,819
United States
Net sales
Net sales	13,454	12,567	26,443	23,709
Europe
Net sales
Net sales	1,780	1,556	3,523	3,145
Asia Pacific
Net sales
Net sales	1,640	1,475	3,049	2,712
Middle East
Net sales
Net sales	845	793	1,584	1,659
Other
Net sales
Net sales	403	302	718	594
U.S. Government
Net sales
Net sales	13,288	12,407	26,123	23,436
International
Net sales
Net sales	4,668	4,126	8,874	8,110
U.S. commercial and other
Net sales
Net sales	166	160	320	273
Fixed-price
Net sales
Net sales	10,806	9,769	20,763	18,671
Cost-reimbursable
Net sales
Net sales	7,316	6,924	14,554	13,148
Products
Net sales
Net sales	15,109	13,758	29,305	26,284
Services
Net sales
Net sales	3,013	2,935	6,012	5,535
Aeronautics
Net sales
Net sales	7,277	6,875	14,122	13,144
Aeronautics | United States
Net sales
Net sales	4,980	4,706	9,673	8,861
Aeronautics | Europe
Net sales
Net sales	1,270	1,146	2,481	2,276
Aeronautics | Asia Pacific
Net sales
Net sales	685	690	1,321	1,365
Aeronautics | Middle East
Net sales
Net sales	194	226	397	451
Aeronautics | Other
Net sales
Net sales	148	107	250	191
Aeronautics | U.S. Government
Net sales
Net sales	4,941	4,621	9,607	8,738
Aeronautics | International
Net sales
Net sales	2,297	2,169	4,449	4,283
Aeronautics | U.S. commercial and other
Net sales
Net sales	39	85	66	123
Aeronautics | Fixed-price
Net sales
Net sales	4,945	4,656	9,529	8,968
Aeronautics | Cost-reimbursable
Net sales
Net sales	2,332	2,219	4,593	4,176
Aeronautics | Products
Net sales
Net sales	5,971	5,645	11,563	10,801
Aeronautics | Services
Net sales
Net sales	1,306	1,230	2,559	2,343
MFC
Net sales
Net sales	3,102	2,755	6,095	5,143
MFC | United States
Net sales
Net sales	2,246	1,914	4,415	3,497
MFC | Europe
Net sales
Net sales	209	174	454	385
MFC | Asia Pacific
Net sales
Net sales	180	215	367	317
MFC | Middle East
Net sales
Net sales	450	411	820	866
MFC | Other
Net sales
Net sales	17	41	39	78
MFC | U.S. Government
Net sales
Net sales	2,241	1,911	4,408	3,492
MFC | International
Net sales
Net sales	856	841	1,680	1,646
MFC | U.S. commercial and other
Net sales
Net sales	5	3	7	5
MFC | Fixed-price
Net sales
Net sales	2,124	1,863	4,120	3,481
MFC | Cost-reimbursable
Net sales
Net sales	978	892	1,975	1,662
MFC | Products
Net sales
Net sales	2,742	2,412	5,406	4,501
MFC | Services
Net sales
Net sales	360	343	689	642
RMS
Net sales
Net sales	4,548	3,897	8,636	7,407
RMS | United States
Net sales
Net sales	3,078	2,822	6,004	5,312
RMS | Europe
Net sales
Net sales	282	212	551	437
RMS | Asia Pacific
Net sales
Net sales	750	554	1,290	992
RMS | Middle East
Net sales
Net sales	200	155	362	341
RMS | Other
Net sales
Net sales	238	154	429	325
RMS | U.S. Government
Net sales
Net sales	2,999	2,754	5,839	5,177
RMS | International
Net sales
Net sales	1,470	1,075	2,632	2,095
RMS | U.S. commercial and other
Net sales
Net sales	79	68	165	135
RMS | Fixed-price
Net sales
Net sales	2,812	2,451	5,289	4,659
RMS | Cost-reimbursable
Net sales
Net sales	1,736	1,446	3,347	2,748
RMS | Products
Net sales
Net sales	3,705	3,041	6,946	5,833
RMS | Services
Net sales
Net sales	843	856	1,690	1,574
Space
Net sales
Net sales	3,195	3,166	6,464	6,125
Space | United States
Net sales
Net sales	3,150	3,125	6,351	6,039
Space | Europe
Net sales
Net sales	19	24	37	47
Space | Asia Pacific
Net sales
Net sales	25	16	71	38
Space | Middle East
Net sales
Net sales	1	1	5	1
Space | Other
Net sales
Net sales	0	0	0	0
Space | U.S. Government
Net sales
Net sales	3,107	3,121	6,269	6,029
Space | International
Net sales
Net sales	45	41	113	86
Space | U.S. commercial and other
Net sales
Net sales	43	4	82	10
Space | Fixed-price
Net sales
Net sales	925	799	1,825	1,563
Space | Cost-reimbursable
Net sales
Net sales	2,270	2,367	4,639	4,562
Space | Products
Net sales
Net sales	2,691	2,660	5,390	5,149
Space | Services
Net sales
Net sales	$ 504	$ 506	$ 1,074	$ 976