Goodwill and Intangible Assets - Changes In Carrying Amount of Goodwill by Reporting Unit (Details) $ in Millions	6 Months Ended
	Jul. 04, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 20,053	[1]
Acquisitions	27	[2]
Other	(59)	[3]
Goodwill, end of period	20,021	[1]
Aerospace
Goodwill [Roll Forward]
Goodwill, beginning of period	3,065	[1]
Acquisitions	27	[2]
Other	(72)	[3]
Goodwill, end of period	3,020	[1]
Marine Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	297	[1]
Acquisitions	0	[2]
Other	0	[3]
Goodwill, end of period	297	[1]
Combat Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	2,786	[1]
Acquisitions	0	[2]
Other	6	[3]
Goodwill, end of period	2,792	[1]
Technologies
Goodwill [Roll Forward]
Goodwill, beginning of period	13,905	[1]
Acquisitions	0	[2]
Other	7	[3]
Goodwill, end of period	13,912	[1]
Accumulated impairment losses	$ 1,800

[1] Goodwill in the Technologies reporting unit was net of $1.8 billion of accumulated impairment losses.

[2] Included adjustments during the purchase price allocation period.

[3] Consisted primarily of adjustments for foreign currency translation.