Scitor Acquisition (Detail 1) - USD ($) $ in Millions		1 Months Ended	3 Months Ended								4 Months Ended	8 Months Ended	12 Months Ended			15 Months Ended
	May. 04, 2015	Aug. 31, 2015	Jan. 29, 2016	Oct. 30, 2015	Jul. 31, 2015	May. 01, 2015	Jan. 30, 2015	Oct. 31, 2014	Aug. 01, 2014	May. 02, 2014	Jan. 31, 2014	Sep. 27, 2013	Jan. 29, 2016	Jan. 30, 2015	Jan. 31, 2014	Jan. 29, 2016
Business Acquisition [Line Items]
Purchase consideration paid, net of cash acquired													$ 764
Acquisition and integration costs													26
Deferred financing fees													17		$ 5
Revenues			$ 1,071	$ 1,136	$ 1,099	$ 1,009	$ 952	$ 1,004	$ 952	$ 977			4,315	$ 3,885	4,121
Net income			$ 28	$ 34	$ 22	$ 33	36	$ 37	$ 34	$ 34	$ 44	$ 69	$ 117	$ 141	$ 113
Scitor Holdings, Inc.
Business Acquisition [Line Items]
Date of acquisition													May 04, 2015
Purchase consideration paid, net of cash acquired	$ 764
Amount deposited to adjustment and indemnification escrow accounts included in cash consideration paid	43
Amount released from escrow account on settlement of working capital adjustment		$ 3
Acquisition and integration costs																$ 44
Deferred financing fees													$ 17
Acquisition expenses	$ 28						$ 1						10
Integration costs													16
Revenues													428
Net income													$ 7