(Operating Results Classified as Discontinued Operations) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Nov. 01, 2013	Aug. 02, 2013	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Discontinued Operation
Bad debt expense	$ 42		$ 44	$ 2	$ 0
Intangible asset impairment charges	19	30	51	0	0
Separation transaction and restructuring expenses			65	11	0
SAIC
Discontinued Operation
Revenues			2,712	4,683	4,632
Cost of revenues			2,447	4,230	4,157
Selling, general and administrative expenses			42	65	63
Bad debt expense			0	2	1
Separation transaction and restructuring expenses			55	28	0
Operating income			168	358	411
Other Disposals
Discontinued Operation
Revenues			16	77	189
Cost of revenues			18	65	153
Selling, general and administrative expenses			24	50	56
Intangible asset impairment charges			2	6	18
Operating income			$ (28)	$ (44)	$ (38)