Revenue - Revenue by Contract Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2023	Jul. 03, 2022	Jul. 02, 2023	Jul. 03, 2022
Revenue [Line Items]
Total revenue	$ 10,152	$ 9,189	$ 20,033	$ 18,581
Fixed-price
Revenue [Line Items]
Total revenue	6,364	5,950	12,542	12,027
Cost-reimbursement
Revenue [Line Items]
Total revenue	3,054	2,509	6,017	5,084
Time-and-materials
Revenue [Line Items]
Total revenue	734	730	1,474	1,470
Aerospace
Revenue [Line Items]
Total revenue	1,953	1,867	3,845	3,770
Aerospace | Fixed-price
Revenue [Line Items]
Total revenue	1,697	1,614	3,329	3,287
Aerospace | Cost-reimbursement
Revenue [Line Items]
Total revenue	0	0	0	0
Aerospace | Time-and-materials
Revenue [Line Items]
Total revenue	256	253	516	483
Marine Systems
Revenue [Line Items]
Total revenue	3,059	2,651	6,051	5,302
Marine Systems | Fixed-price
Revenue [Line Items]
Total revenue	1,609	1,609	3,174	3,210
Marine Systems | Cost-reimbursement
Revenue [Line Items]
Total revenue	1,449	1,042	2,876	2,092
Marine Systems | Time-and-materials
Revenue [Line Items]
Total revenue	1	0	1	0
Combat Systems
Revenue [Line Items]
Total revenue	1,924	1,666	3,680	3,341
Combat Systems | Fixed-price
Revenue [Line Items]
Total revenue	1,684	1,441	3,212	2,906
Combat Systems | Cost-reimbursement
Revenue [Line Items]
Total revenue	222	211	431	408
Combat Systems | Time-and-materials
Revenue [Line Items]
Total revenue	18	14	37	27
Technologies
Revenue [Line Items]
Total revenue	3,216	3,005	6,457	6,168
Technologies | Fixed-price
Revenue [Line Items]
Total revenue	1,374	1,286	2,827	2,624
Technologies | Cost-reimbursement
Revenue [Line Items]
Total revenue	1,383	1,256	2,710	2,584
Technologies | Time-and-materials
Revenue [Line Items]
Total revenue	$ 459	$ 463	$ 920	$ 960