Schedule of Segment Reporting Information by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 01, 2013	Oct. 31, 2012	Nov. 01, 2013	Oct. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 1,420	$ 1,673	$ 4,486	$ 4,899
Operating income (loss)	(7)	100	69	314
Health and Engineering
Segment Reporting Information [Line Items]
Revenues	408	508	1,380	1,341
Operating income (loss)	(30)	46	2	107
National Security Solutions
Segment Reporting Information [Line Items]
Revenues	1,014	1,166	3,117	3,563
Operating income (loss)	63	79	195	260
Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	(1)	(1)	(3)	(4)
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	(1)	0	(8)	(1)
Operating income (loss)	$ (40)	$ (25)	$ (128)	$ (53)