Goodwill and Intangible Assets - Changes In Carrying Amount of Goodwill by Reporting Unit (Details) $ in Millions	6 Months Ended
	Jun. 28, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 19,677	[1]
Acquisitions/divestitures	21	[2]
Other	20	[3]
Goodwill, end of period	19,718	[1]
Aerospace
Goodwill [Roll Forward]
Goodwill, beginning of period	2,831	[1]
Acquisitions/divestitures	21	[2]
Other	47	[3]
Goodwill, end of period	2,899	[1]
Combat Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	2,681	[1]
Acquisitions/divestitures	0	[2]
Other	(31)	[3]
Goodwill, end of period	2,650	[1]
Information Technology
Goodwill [Roll Forward]
Goodwill, beginning of period	9,700	[1]
Acquisitions/divestitures	0	[2]
Other	0	[3]
Goodwill, end of period	9,700	[1]
Accumulated impairment losses	536
Mission Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	4,168	[1]
Acquisitions/divestitures	0	[2]
Other	4	[3]
Goodwill, end of period	4,172	[1]
Accumulated impairment losses	1,300
Marine Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	297	[1]
Acquisitions/divestitures	0	[2]
Other	0	[3]
Goodwill, end of period	$ 297	[1]

[1] Goodwill in the Information Technology and Mission Systems reporting units is net of $536 and $1.3 billion of accumulated impairment losses, respectively.

[2] Includes a business acquired in our Aerospace segment and adjustments during the purchase price allocation period.

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