Net Sales By Customer (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Total net sales	$ 12,530	$ 11,114	$ 11,306	$ 10,650	$ 11,533	$ 11,347	$ 11,408	$ 11,070	$ 45,600		$ 45,358		$ 47,182
U.S. Government
Segment Reporting Information [Line Items]
Total net sales									36,090		37,173		38,788
U.S. Government | Aeronautics
Segment Reporting Information [Line Items]
Total net sales									10,704		11,025		11,587
U.S. Government | Information Systems & Global Solutions
Segment Reporting Information [Line Items]
Total net sales									6,951		7,768		8,340
U.S. Government | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total net sales									5,223		5,177		5,224
U.S. Government | Mission Systems and Training
Segment Reporting Information [Line Items]
Total net sales									5,395		5,370		5,685
U.S. Government | Space Systems
Segment Reporting Information [Line Items]
Total net sales									7,817		7,833		7,952
International
Segment Reporting Information [Line Items]
Total net sales									9,015	[1]	7,768	[1]	8,056	[1]
International | Aeronautics
Segment Reporting Information [Line Items]
Total net sales									4,183	[1]	3,078	[1]	3,323	[1]
International | Information Systems & Global Solutions
Segment Reporting Information [Line Items]
Total net sales									630	[1]	399	[1]	380	[1]
International | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total net sales									2,443	[1]	2,546	[1]	2,208	[1]
International | Mission Systems and Training
Segment Reporting Information [Line Items]
Total net sales									1,694	[1]	1,672	[1]	1,826	[1]
International | Space Systems
Segment Reporting Information [Line Items]
Total net sales									65	[1]	73	[1]	319	[1]
United States Commercial and Other
Segment Reporting Information [Line Items]
Total net sales									495		417		338
United States Commercial and Other | Aeronautics
Segment Reporting Information [Line Items]
Total net sales									33		20		43
United States Commercial and Other | Information Systems & Global Solutions
Segment Reporting Information [Line Items]
Total net sales									207		200		126
United States Commercial and Other | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total net sales									14		34		25
United States Commercial and Other | Mission Systems and Training
Segment Reporting Information [Line Items]
Total net sales									58		111		68
United States Commercial and Other | Space Systems
Segment Reporting Information [Line Items]
Total net sales									$ 183		$ 52		$ 76

[1] International sales include foreign military sales contracted through the U.S. Government, direct commercial sales with international governments and commercial and other sales to international customers.