Acquisitions, Goodwill and Intangible Assets Changes In Amount Of Goodwill (Details) - USD ($) $ in Millions		9 Months Ended
		Oct. 01, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	$ 11,445
Acquisitions	[2]	276
Other	[3]	197
Goodwill, end of period	[1]	11,918
Aerospace
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	2,537
Acquisitions	[2]	32
Other	[3]	88
Goodwill, end of period	[1]	2,657
Combat Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	2,598
Acquisitions	[2]	0
Other	[3]	87
Goodwill, end of period	[1]	2,685
Information Systems and Technology
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	6,013
Acquisitions	[2]	244
Other	[3]	22
Goodwill, end of period	[1]	6,279
Accumulated impairment loss		2,000	$ 2,000
Marine Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	297
Acquisitions	[2]	0
Other	[3]	0
Goodwill, end of period	[1]	$ 297

[1] Goodwill on December 31, 2016, and October 1, 2017, in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses.

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

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