Revenue - Revenue by Customer (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Revenue [Line Items]
Total revenue	$ 13,041	$ 11,976	$ 25,264	$ 22,707
U.S. Government - DoD
Revenue [Line Items]
Total revenue	7,597	6,717	14,442	13,067
U.S. Government - Non-DoD
Revenue [Line Items]
Total revenue	1,195	1,168	2,445	2,354
U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	229	265	484	576
Total U.S. government
Revenue [Line Items]
Total revenue	9,021	8,150	17,371	15,997
U.S. commercial
Revenue [Line Items]
Total revenue	1,732	1,542	3,062	2,858
Non-U.S. government
Revenue [Line Items]
Total revenue	1,110	1,256	2,055	2,184
Non-U.S. commercial
Revenue [Line Items]
Total revenue	1,178	1,028	2,776	1,668
Aerospace
Revenue [Line Items]
Total revenue	3,062	2,940	6,088	5,024
Aerospace \| U.S. Government - DoD
Revenue [Line Items]
Total revenue	90	53	155	104
Aerospace \| U.S. Government - Non-DoD
Revenue [Line Items]
Total revenue	0	0	0	0
Aerospace \| U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	5	10	10	21
Aerospace \| Total U.S. government
Revenue [Line Items]
Total revenue	95	63	165	125
Aerospace \| U.S. commercial
Revenue [Line Items]
Total revenue	1,614	1,421	2,838	2,639
Aerospace \| Non-U.S. government
Revenue [Line Items]
Total revenue	223	481	394	695
Aerospace \| Non-U.S. commercial
Revenue [Line Items]
Total revenue	1,130	975	2,691	1,565
Marine Systems
Revenue [Line Items]
Total revenue	4,220	3,453	7,809	6,784
Marine Systems \| U.S. Government - DoD
Revenue [Line Items]
Total revenue	4,183	3,411	7,741	6,709
Marine Systems \| U.S. Government - Non-DoD
Revenue [Line Items]
Total revenue	0	1	0	1
Marine Systems \| U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	35	39	64	70
Marine Systems \| Total U.S. government
Revenue [Line Items]
Total revenue	4,218	3,451	7,805	6,780
Marine Systems \| U.S. commercial
Revenue [Line Items]
Total revenue	1	1	2	2
Marine Systems \| Non-U.S. government
Revenue [Line Items]
Total revenue	1	1	2	2
Marine Systems \| Non-U.S. commercial
Revenue [Line Items]
Total revenue	0	0	0	0
Combat Systems
Revenue [Line Items]
Total revenue	2,283	2,288	4,459	4,390
Combat Systems \| U.S. Government - DoD
Revenue [Line Items]
Total revenue	1,207	1,296	2,417	2,468
Combat Systems \| U.S. Government - Non-DoD
Revenue [Line Items]
Total revenue	3	4	5	5
Combat Systems \| U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	185	206	403	464
Combat Systems \| Total U.S. government
Revenue [Line Items]
Total revenue	1,395	1,506	2,825	2,937
Combat Systems \| U.S. commercial
Revenue [Line Items]
Total revenue	71	66	130	119
Combat Systems \| Non-U.S. government
Revenue [Line Items]
Total revenue	776	673	1,434	1,259
Combat Systems \| Non-U.S. commercial
Revenue [Line Items]
Total revenue	41	43	70	75
Technologies
Revenue [Line Items]
Total revenue	3,476	3,295	6,908	6,509
Technologies \| U.S. Government - DoD
Revenue [Line Items]
Total revenue	2,117	1,957	4,129	3,786
Technologies \| U.S. Government - Non-DoD
Revenue [Line Items]
Total revenue	1,192	1,163	2,440	2,348
Technologies \| U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Total revenue	4	10	7	21
Technologies \| Total U.S. government
Revenue [Line Items]
Total revenue	3,313	3,130	6,576	6,155
Technologies \| U.S. commercial
Revenue [Line Items]
Total revenue	46	54	92	98
Technologies \| Non-U.S. government
Revenue [Line Items]
Total revenue	110	101	225	228
Technologies \| Non-U.S. commercial
Revenue [Line Items]
Total revenue	$ 7	$ 10	$ 15	$ 28