Revenue - Revenue by Customer (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Revenue [Line Items]
Revenue	$ 9,392	$ 9,389
U.S. Government - DoD
Revenue [Line Items]
Revenue	5,291	5,141
U.S. Government - Non-DoD
Revenue [Line Items]
Revenue	1,246	1,252
U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Revenue	156	176
Total U.S. government
Revenue [Line Items]
Revenue	6,693	6,569
U.S. commercial
Revenue [Line Items]
Revenue	1,205	981
Non-U.S. government
Revenue [Line Items]
Revenue	908	1,053
Non-U.S. commercial
Revenue [Line Items]
Revenue	586	786
Aerospace
Revenue [Line Items]
Revenue	1,903	1,887
Aerospace | U.S. Government - DoD
Revenue [Line Items]
Revenue	80	58
Aerospace | U.S. Government - Non-DoD
Revenue [Line Items]
Revenue	0	0
Aerospace | U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Revenue	33	19
Aerospace | Total U.S. government
Revenue [Line Items]
Revenue	113	77
Aerospace | U.S. commercial
Revenue [Line Items]
Revenue	1,110	857
Aerospace | Non-U.S. government
Revenue [Line Items]
Revenue	120	190
Aerospace | Non-U.S. commercial
Revenue [Line Items]
Revenue	560	763
Marine Systems
Revenue [Line Items]
Revenue	2,651	2,483
Marine Systems | U.S. Government - DoD
Revenue [Line Items]
Revenue	2,605	2,420
Marine Systems | U.S. Government - Non-DoD
Revenue [Line Items]
Revenue	1	4
Marine Systems | U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Revenue	44	56
Marine Systems | Total U.S. government
Revenue [Line Items]
Revenue	2,650	2,480
Marine Systems | U.S. commercial
Revenue [Line Items]
Revenue	0	1
Marine Systems | Non-U.S. government
Revenue [Line Items]
Revenue	1	2
Marine Systems | Non-U.S. commercial
Revenue [Line Items]
Revenue	0	0
Combat Systems
Revenue [Line Items]
Revenue	1,675	1,820
Combat Systems | U.S. Government - DoD
Revenue [Line Items]
Revenue	855	916
Combat Systems | U.S. Government - Non-DoD
Revenue [Line Items]
Revenue	2	2
Combat Systems | U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Revenue	69	87
Combat Systems | Total U.S. government
Revenue [Line Items]
Revenue	926	1,005
Combat Systems | U.S. commercial
Revenue [Line Items]
Revenue	45	66
Combat Systems | Non-U.S. government
Revenue [Line Items]
Revenue	685	732
Combat Systems | Non-U.S. commercial
Revenue [Line Items]
Revenue	19	17
Technologies
Revenue [Line Items]
Revenue	3,163	3,199
Technologies | U.S. Government - DoD
Revenue [Line Items]
Revenue	1,751	1,747
Technologies | U.S. Government - Non-DoD
Revenue [Line Items]
Revenue	1,243	1,246
Technologies | U.S. Government - Foreign Military Sales (FMS)
Revenue [Line Items]
Revenue	10	14
Technologies | Total U.S. government
Revenue [Line Items]
Revenue	3,004	3,007
Technologies | U.S. commercial
Revenue [Line Items]
Revenue	50	57
Technologies | Non-U.S. government
Revenue [Line Items]
Revenue	102	129
Technologies | Non-U.S. commercial
Revenue [Line Items]
Revenue	$ 7	$ 6