INFORMATION ON BUSINESS SEGMENTS - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Sales
Net sales	$ 18,155	$ 18,122	$ 36,118	$ 35,317
United States
Sales
Net sales	13,239	13,454	26,280	26,443
Europe
Sales
Net sales	2,086	1,780	4,054	3,523
Asia Pacific
Sales
Net sales	1,857	1,640	3,601	3,049
Middle East
Sales
Net sales	757	845	1,461	1,584
Other
Sales
Net sales	216	403	722	718
U.S. Government
Sales
Net sales	13,171	13,288	26,120	26,123
International
Sales
Net sales	4,916	4,668	9,838	8,874
U.S. commercial and other
Sales
Net sales	68	166	160	320
Fixed-price
Sales
Net sales	10,566	10,806	21,321	20,763
Cost-reimbursable
Sales
Net sales	7,589	7,316	14,797	14,554
Products
Sales
Net sales	15,149	15,109	30,085	29,305
Services
Sales
Net sales	3,006	3,013	6,033	6,012
Aeronautics
Sales
Net sales	7,420	7,277	14,477	14,122
Aeronautics | United States
Sales
Net sales	4,654	4,980	9,306	9,673
Aeronautics | Europe
Sales
Net sales	1,404	1,270	2,651	2,481
Aeronautics | Asia Pacific
Sales
Net sales	984	685	1,824	1,321
Aeronautics | Middle East
Sales
Net sales	159	194	307	397
Aeronautics | Other
Sales
Net sales	219	148	389	250
Aeronautics | U.S. Government
Sales
Net sales	4,646	4,941	9,288	9,607
Aeronautics | International
Sales
Net sales	2,766	2,297	5,171	4,449
Aeronautics | U.S. commercial and other
Sales
Net sales	8	39	18	66
Aeronautics | Fixed-price
Sales
Net sales	4,912	4,945	9,625	9,529
Aeronautics | Cost-reimbursable
Sales
Net sales	2,508	2,332	4,852	4,593
Aeronautics | Products
Sales
Net sales	5,960	5,971	11,706	11,563
Aeronautics | Services
Sales
Net sales	1,460	1,306	2,771	2,559
MFC
Sales
Net sales	3,433	3,102	6,806	6,095
MFC | United States
Sales
Net sales	2,443	2,246	4,838	4,415
MFC | Europe
Sales
Net sales	381	209	776	454
MFC | Asia Pacific
Sales
Net sales	223	180	447	367
MFC | Middle East
Sales
Net sales	375	450	717	820
MFC | Other
Sales
Net sales	11	17	28	39
MFC | U.S. Government
Sales
Net sales	2,440	2,241	4,831	4,408
MFC | International
Sales
Net sales	990	856	1,968	1,680
MFC | U.S. commercial and other
Sales
Net sales	3	5	7	7
MFC | Fixed-price
Sales
Net sales	2,447	2,124	4,887	4,120
MFC | Cost-reimbursable
Sales
Net sales	986	978	1,919	1,975
MFC | Products
Sales
Net sales	3,065	2,742	6,082	5,406
MFC | Services
Sales
Net sales	368	360	724	689
RMS
Sales
Net sales	3,995	4,548	8,323	8,636
RMS | United States
Sales
Net sales	2,910	3,078	5,770	6,004
RMS | Europe
Sales
Net sales	279	282	583	551
RMS | Asia Pacific
Sales
Net sales	601	750	1,234	1,290
RMS | Middle East
Sales
Net sales	219	200	431	362
RMS | Other
Sales
Net sales	(14)	238	305	429
RMS | U.S. Government
Sales
Net sales	2,858	2,999	5,645	5,839
RMS | International
Sales
Net sales	1,085	1,470	2,553	2,632
RMS | U.S. commercial and other
Sales
Net sales	52	79	125	165
RMS | Fixed-price
Sales
Net sales	2,295	2,812	4,955	5,289
RMS | Cost-reimbursable
Sales
Net sales	1,700	1,736	3,368	3,347
RMS | Products
Sales
Net sales	3,332	3,705	6,828	6,946
RMS | Services
Sales
Net sales	663	843	1,495	1,690
Space
Sales
Net sales	3,307	3,195	6,512	6,464
Space | United States
Sales
Net sales	3,232	3,150	6,366	6,351
Space | Europe
Sales
Net sales	22	19	44	37
Space | Asia Pacific
Sales
Net sales	49	25	96	71
Space | Middle East
Sales
Net sales	4	1	6	5
Space | Other
Sales
Net sales	0	0	0	0
Space | U.S. Government
Sales
Net sales	3,227	3,107	6,356	6,269
Space | International
Sales
Net sales	75	45	146	113
Space | U.S. commercial and other
Sales
Net sales	5	43	10	82
Space | Fixed-price
Sales
Net sales	912	925	1,854	1,825
Space | Cost-reimbursable
Sales
Net sales	2,395	2,270	4,658	4,639
Space | Products
Sales
Net sales	2,792	2,691	5,469	5,390
Space | Services
Sales
Net sales	$ 515	$ 504	$ 1,043	$ 1,074