Revenue - Revenue by Contract Type (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Revenue [Line Items]
Revenue	$ 9,392	$ 9,389
Fixed-price
Revenue [Line Items]
Revenue	6,077	6,402
Cost-reimbursement
Revenue [Line Items]
Revenue	2,575	2,297
Time-and-materials
Revenue [Line Items]
Revenue	740	690
Aerospace
Revenue [Line Items]
Revenue	1,903	1,887
Aerospace | Fixed-price
Revenue [Line Items]
Revenue	1,673	1,709
Aerospace | Cost-reimbursement
Revenue [Line Items]
Revenue	0	0
Aerospace | Time-and-materials
Revenue [Line Items]
Revenue	230	178
Marine Systems
Revenue [Line Items]
Revenue	2,651	2,483
Marine Systems | Fixed-price
Revenue [Line Items]
Revenue	1,601	1,784
Marine Systems | Cost-reimbursement
Revenue [Line Items]
Revenue	1,050	699
Marine Systems | Time-and-materials
Revenue [Line Items]
Revenue	0	0
Combat Systems
Revenue [Line Items]
Revenue	1,675	1,820
Combat Systems | Fixed-price
Revenue [Line Items]
Revenue	1,465	1,569
Combat Systems | Cost-reimbursement
Revenue [Line Items]
Revenue	197	235
Combat Systems | Time-and-materials
Revenue [Line Items]
Revenue	13	16
Technologies
Revenue [Line Items]
Revenue	3,163	3,199
Technologies | Fixed-price
Revenue [Line Items]
Revenue	1,338	1,340
Technologies | Cost-reimbursement
Revenue [Line Items]
Revenue	1,328	1,363
Technologies | Time-and-materials
Revenue [Line Items]
Revenue	$ 497	$ 496