INFORMATION ON BUSINESS SEGMENTS - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 25, 2023	Jun. 26, 2022	Jun. 25, 2023	Jun. 26, 2022
Net sales
Net sales	$ 16,693	$ 15,446	$ 31,819	$ 30,410
United States
Net sales
Net sales	12,567	11,597	23,709	22,554
Europe
Net sales
Net sales	1,556	1,305	3,145	2,795
Asia Pacific
Net sales
Net sales	1,475	1,371	2,712	2,637
Middle East
Net sales
Net sales	793	843	1,659	1,749
Other
Net sales
Net sales	302	330	594	675
U.S. Government
Net sales
Net sales	12,407	11,458	23,436	22,293
International
Net sales
Net sales	4,126	3,849	8,110	7,856
U.S. commercial and other
Net sales
Net sales	160	139	273	261
Fixed-price
Net sales
Net sales	9,769	9,201	18,671	18,455
Cost-reimbursable
Net sales
Net sales	6,924	6,245	13,148	11,955
Products
Net sales
Net sales	13,758	12,761	26,284	25,255
Services
Net sales
Net sales	2,935	2,685	5,535	5,155
Aeronautics
Net sales
Net sales	6,875	5,862	13,144	12,263
Aeronautics | United States
Net sales
Net sales	4,706	3,994	8,861	8,245
Aeronautics | Europe
Net sales
Net sales	1,146	845	2,276	1,868
Aeronautics | Asia Pacific
Net sales
Net sales	690	705	1,365	1,426
Aeronautics | Middle East
Net sales
Net sales	226	222	451	484
Aeronautics | Other
Net sales
Net sales	107	96	191	240
Aeronautics | U.S. Government
Net sales
Net sales	4,621	3,963	8,738	8,176
Aeronautics | International
Net sales
Net sales	2,169	1,868	4,283	4,018
Aeronautics | U.S. commercial and other
Net sales
Net sales	85	31	123	69
Aeronautics | Fixed-price
Net sales
Net sales	4,656	3,916	8,968	8,602
Aeronautics | Cost-reimbursable
Net sales
Net sales	2,219	1,946	4,176	3,661
Aeronautics | Products
Net sales
Net sales	5,645	4,804	10,801	10,221
Aeronautics | Services
Net sales
Net sales	1,230	1,058	2,343	2,042
MFC
Net sales
Net sales	2,755	2,747	5,143	5,199
MFC | United States
Net sales
Net sales	1,914	1,924	3,497	3,524
MFC | Europe
Net sales
Net sales	174	262	385	518
MFC | Asia Pacific
Net sales
Net sales	215	107	317	213
MFC | Middle East
Net sales
Net sales	411	417	866	882
MFC | Other
Net sales
Net sales	41	37	78	62
MFC | U.S. Government
Net sales
Net sales	1,911	1,924	3,492	3,519
MFC | International
Net sales
Net sales	841	823	1,646	1,675
MFC | U.S. commercial and other
Net sales
Net sales	3	0	5	5
MFC | Fixed-price
Net sales
Net sales	1,863	1,943	3,481	3,656
MFC | Cost-reimbursable
Net sales
Net sales	892	804	1,662	1,543
MFC | Products
Net sales
Net sales	2,412	2,444	4,501	4,617
MFC | Services
Net sales
Net sales	343	303	642	582
RMS
Net sales
Net sales	3,897	4,012	7,407	7,564
RMS | United States
Net sales
Net sales	2,822	2,883	5,312	5,464
RMS | Europe
Net sales
Net sales	212	178	437	365
RMS | Asia Pacific
Net sales
Net sales	554	553	992	985
RMS | Middle East
Net sales
Net sales	155	201	341	377
RMS | Other
Net sales
Net sales	154	197	325	373
RMS | U.S. Government
Net sales
Net sales	2,754	2,785	5,177	5,296
RMS | International
Net sales
Net sales	1,075	1,129	2,095	2,100
RMS | U.S. commercial and other
Net sales
Net sales	68	98	135	168
RMS | Fixed-price
Net sales
Net sales	2,451	2,589	4,659	4,807
RMS | Cost-reimbursable
Net sales
Net sales	1,446	1,423	2,748	2,757
RMS | Products
Net sales
Net sales	3,041	3,150	5,833	5,938
RMS | Services
Net sales
Net sales	856	862	1,574	1,626
Space
Net sales
Net sales	3,166	2,825	6,125	5,384
Space | United States
Net sales
Net sales	3,125	2,796	6,039	5,321
Space | Europe
Net sales
Net sales	24	20	47	44
Space | Asia Pacific
Net sales
Net sales	16	6	38	13
Space | Middle East
Net sales
Net sales	1	3	1	6
Space | Other
Net sales
Net sales	0	0	0	0
Space | U.S. Government
Net sales
Net sales	3,121	2,786	6,029	5,302
Space | International
Net sales
Net sales	41	29	86	63
Space | U.S. commercial and other
Net sales
Net sales	4	10	10	19
Space | Fixed-price
Net sales
Net sales	799	753	1,563	1,390
Space | Cost-reimbursable
Net sales
Net sales	2,367	2,072	4,562	3,994
Space | Products
Net sales
Net sales	2,660	2,363	5,149	4,479
Space | Services
Net sales
Net sales	$ 506	$ 462	$ 976	$ 905