Revenue - Revenue by Customer (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Revenue [Line Items]
Total revenue	$ 12,907	$ 11,671	$ 38,171	$ 34,378
Department of War (DoW)
Revenue [Line Items]
Total revenue	7,325	6,909	21,767	19,976
Non-DoW
Revenue [Line Items]
Total revenue	1,211	1,239	3,656	3,593
U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	251	255	735	831
Total U.S. government
Revenue [Line Items]
Total revenue	8,787	8,403	26,158	24,400
U.S. commercial
Revenue [Line Items]
Total revenue	2,124	1,695	5,186	4,553
Non-U.S. government
Revenue [Line Items]
Total revenue	1,168	1,023	3,223	3,207
Non-U.S. commercial
Revenue [Line Items]
Total revenue	828	550	3,604	2,218
Aerospace
Revenue [Line Items]
Total revenue	3,234	2,482	9,322	7,506
Aerospace \| Department of War (DoW)
Revenue [Line Items]
Total revenue	85	83	240	187
Aerospace \| Non-DoW
Revenue [Line Items]
Total revenue	0	0	0	0
Aerospace \| U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	4	9	14	30
Aerospace \| Total U.S. government
Revenue [Line Items]
Total revenue	89	92	254	217
Aerospace \| U.S. commercial
Revenue [Line Items]
Total revenue	2,031	1,586	4,869	4,225
Aerospace \| Non-U.S. government
Revenue [Line Items]
Total revenue	363	294	757	989
Aerospace \| Non-U.S. commercial
Revenue [Line Items]
Total revenue	751	510	3,442	2,075
Marine Systems
Revenue [Line Items]
Total revenue	4,096	3,599	11,905	10,383
Marine Systems \| Department of War (DoW)
Revenue [Line Items]
Total revenue	4,050	3,571	11,791	10,280
Marine Systems \| Non-DoW
Revenue [Line Items]
Total revenue	2	0	2	1
Marine Systems \| U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	42	28	106	98
Marine Systems \| Total U.S. government
Revenue [Line Items]
Total revenue	4,094	3,599	11,899	10,379
Marine Systems \| U.S. commercial
Revenue [Line Items]
Total revenue	0	0	2	2
Marine Systems \| Non-U.S. government
Revenue [Line Items]
Total revenue	2	0	4	2
Marine Systems \| Non-U.S. commercial
Revenue [Line Items]
Total revenue	0	0	0	0
Combat Systems
Revenue [Line Items]
Total revenue	2,252	2,212	6,711	6,602
Combat Systems \| Department of War (DoW)
Revenue [Line Items]
Total revenue	1,237	1,274	3,654	3,742
Combat Systems \| Non-DoW
Revenue [Line Items]
Total revenue	1	1	6	6
Combat Systems \| U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	201	211	604	675
Combat Systems \| Total U.S. government
Revenue [Line Items]
Total revenue	1,439	1,486	4,264	4,423
Combat Systems \| U.S. commercial
Revenue [Line Items]
Total revenue	53	61	183	180
Combat Systems \| Non-U.S. government
Revenue [Line Items]
Total revenue	693	631	2,127	1,890
Combat Systems \| Non-U.S. commercial
Revenue [Line Items]
Total revenue	67	34	137	109
Technologies
Revenue [Line Items]
Total revenue	3,325	3,378	10,233	9,887
Technologies \| Department of War (DoW)
Revenue [Line Items]
Total revenue	1,953	1,981	6,082	5,767
Technologies \| Non-DoW
Revenue [Line Items]
Total revenue	1,208	1,238	3,648	3,586
Technologies \| U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	4	7	11	28
Technologies \| Total U.S. government
Revenue [Line Items]
Total revenue	3,165	3,226	9,741	9,381
Technologies \| U.S. commercial
Revenue [Line Items]
Total revenue	40	48	132	146
Technologies \| Non-U.S. government
Revenue [Line Items]
Total revenue	110	98	335	326
Technologies \| Non-U.S. commercial
Revenue [Line Items]
Total revenue	$ 10	$ 6	$ 25	$ 34