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Segment Information - Summary of Financial Information (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jul. 04, 2021		Jun. 28, 2020		Jul. 04, 2021	Jun. 28, 2020
Segment Reporting Information [Line Items]
Revenue	$ 9,220		$ 9,264		$ 18,609	$ 18,013
Operating Earnings	959		834		1,897	1,768
Aerospace
Segment Reporting Information [Line Items]
Revenue	1,622		1,974		3,509	3,665
Marine Systems
Segment Reporting Information [Line Items]
Revenue	2,536		2,471		5,019	4,717
Combat Systems
Segment Reporting Information [Line Items]
Revenue	1,899		1,754		3,719	3,462
Technologies
Segment Reporting Information [Line Items]
Revenue	3,163		3,065		6,362	6,169
Operating Segments | Aerospace
Segment Reporting Information [Line Items]
Revenue	1,622		1,974		3,509	3,665
Operating Earnings	195		159		415	399
Operating Segments | Marine Systems
Segment Reporting Information [Line Items]
Revenue	2,536		2,471		5,019	4,717
Operating Earnings	210		200		410	384
Operating Segments | Combat Systems
Segment Reporting Information [Line Items]
Revenue	1,899		1,754		3,719	3,462
Operating Earnings	266		239		510	462
Operating Segments | Technologies
Segment Reporting Information [Line Items]
Revenue	3,163		3,065		6,362	6,169
Operating Earnings	308		247		614	545
Corporate*
Segment Reporting Information [Line Items]
Revenue	0	[1]	0	[1]	0	0
Operating Earnings	$ (20)	[1]	$ (11)	[1]	$ (52)	$ (22)
[1] Corporate operating results consist primarily of equity-based compensation expense.

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