Business Group Information (Summary Of Financial Information For Each Of Our Business Groups) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 01, 2012		Apr. 03, 2011
Business Group Information [Line Items]
Revenues	$ 7,579		$ 7,798
Operating Earnings	860		929
Aerospace [Member]
Business Group Information [Line Items]
Revenues	1,623		1,353
Operating Earnings	271		230
Combat Systems [Member]
Business Group Information [Line Items]
Revenues	1,911		1,955
Operating Earnings	203		277
Marine Systems [Member]
Business Group Information [Line Items]
Revenues	1,605		1,676
Operating Earnings	185		167
Information Systems And Technology [Member]
Business Group Information [Line Items]
Revenues	2,440		2,814
Operating Earnings	218		276
Corporate [Member]
Business Group Information [Line Items]
Operating Earnings	$ (17)	[1]	$ (21)	[1]

[1] Corporate operating results primarily consists of our stock option expense.