INFORMATION ON BUSINESS SEGMENTS - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 26, 2023
Net sales
Net sales	$ 17,195	$ 15,126
United States
Net sales
Net sales	12,989	11,142
Europe
Net sales
Net sales	1,743	1,589
Asia Pacific
Net sales
Net sales	1,409	1,237
Middle East
Net sales
Net sales	739	866
Other
Net sales
Net sales	315	292
U.S. Government
Net sales
Net sales	12,835	11,029
International
Net sales
Net sales	4,206	3,984
U.S. commercial and other
Net sales
Net sales	154	113
Fixed-price
Net sales
Net sales	9,957	8,902
Cost-reimbursable
Net sales
Net sales	7,238	6,224
Products
Net sales
Net sales	14,196	12,526
Services
Net sales
Net sales	2,999	2,600
Aeronautics
Net sales
Net sales	6,845	6,269
Aeronautics | United States
Net sales
Net sales	4,693	4,155
Aeronautics | Europe
Net sales
Net sales	636	1,130
Aeronautics | Asia Pacific
Net sales
Net sales	1,211	675
Aeronautics | Middle East
Net sales
Net sales	203	225
Aeronautics | Other
Net sales
Net sales	102	84
Aeronautics | U.S. Government
Net sales
Net sales	4,666	4,117
Aeronautics | International
Net sales
Net sales	2,152	2,114
Aeronautics | U.S. commercial and other
Net sales
Net sales	27	38
Aeronautics | Fixed-price
Net sales
Net sales	4,584	4,312
Aeronautics | Cost-reimbursable
Net sales
Net sales	2,261	1,957
Aeronautics | Products
Net sales
Net sales	5,592	5,156
Aeronautics | Services
Net sales
Net sales	1,253	1,113
MFC
Net sales
Net sales	2,993	2,388
MFC | United States
Net sales
Net sales	2,169	1,583
MFC | Europe
Net sales
Net sales	187	211
MFC | Asia Pacific
Net sales
Net sales	245	102
MFC | Middle East
Net sales
Net sales	370	455
MFC | Other
Net sales
Net sales	22	37
MFC | U.S. Government
Net sales
Net sales	2,167	1,581
MFC | International
Net sales
Net sales	824	805
MFC | U.S. commercial and other
Net sales
Net sales	2	2
MFC | Fixed-price
Net sales
Net sales	1,996	1,618
MFC | Cost-reimbursable
Net sales
Net sales	997	770
MFC | Products
Net sales
Net sales	2,664	2,089
MFC | Services
Net sales
Net sales	329	299
RMS
Net sales
Net sales	4,088	3,510
RMS | United States
Net sales
Net sales	2,926	2,490
RMS | Europe
Net sales
Net sales	540	225
RMS | Asia Pacific
Net sales
Net sales	269	438
RMS | Middle East
Net sales
Net sales	162	186
RMS | Other
Net sales
Net sales	191	171
RMS | U.S. Government
Net sales
Net sales	2,840	2,423
RMS | International
Net sales
Net sales	1,162	1,020
RMS | U.S. commercial and other
Net sales
Net sales	86	67
RMS | Fixed-price
Net sales
Net sales	2,477	2,208
RMS | Cost-reimbursable
Net sales
Net sales	1,611	1,302
RMS | Products
Net sales
Net sales	3,241	2,792
RMS | Services
Net sales
Net sales	847	718
Space
Net sales
Net sales	3,269	2,959
Space | United States
Net sales
Net sales	3,201	2,914
Space | Europe
Net sales
Net sales	46	23
Space | Asia Pacific
Net sales
Net sales	18	22
Space | Middle East
Net sales
Net sales	4	0
Space | Other
Net sales
Net sales	0	0
Space | U.S. Government
Net sales
Net sales	3,162	2,908
Space | International
Net sales
Net sales	68	45
Space | U.S. commercial and other
Net sales
Net sales	39	6
Space | Fixed-price
Net sales
Net sales	900	764
Space | Cost-reimbursable
Net sales
Net sales	2,369	2,195
Space | Products
Net sales
Net sales	2,699	2,489
Space | Services
Net sales
Net sales	$ 570	$ 470