Segment Reporting Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jul. 01, 2012		Jun. 30, 2013		Jul. 01, 2012
Segment Reporting Information [Line Items]
Revenues	$ 7,911		$ 7,922		$ 15,315		$ 15,501
Operating Earnings	960		970		1,807		1,830
Aerospace
Segment Reporting Information [Line Items]
Revenues	2,053		1,592		3,831		3,215
Operating Earnings	389		257		699		528
Combat Systems
Segment Reporting Information [Line Items]
Revenues	1,549		2,149		3,102		4,060
Operating Earnings	218		322		433		525
Marine Systems
Segment Reporting Information [Line Items]
Revenues	1,759		1,653		3,385		3,258
Operating Earnings	178		183		337		368
Information Systems and Technology
Segment Reporting Information [Line Items]
Revenues	2,550		2,528		4,997		4,968
Operating Earnings	198		226		383		444
Corporate
Segment Reporting Information [Line Items]
Revenues	0	[1]	0	[1]	0	[1]	0	[1]
Operating Earnings	$ (23)	[1]	$ (18)	[1]	$ (45)	[1]	$ (35)	[1]

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