Business Overview and Summary of Significant Accounting Policies (Detail 1) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Jan. 30, 2015 USD ($)	Oct. 30, 2015 USD ($) $ / shares	Oct. 31, 2014 USD ($) $ / shares	Oct. 30, 2015 USD ($) Segment $ / shares	Oct. 31, 2014 USD ($) $ / shares	May. 04, 2015
Significant Accounting Policies [Line Items]
Number of reportable segments | Segment				1
Increase (decrease) in operating income due to aggregate changes in contract estimates		$ 1	$ 4	$ 9	$ 9
Increase (decrease) in diluted earnings per share due to aggregate changes in contract estimates | $ / shares		$ 0.02	$ 0.05	$ 0.12	$ 0.12
Operating cycle (in years)				greater than one year
Reclassification of current portion of unamortized debt issuance costs to long-term debt	$ 1
Reclassification of noncurrent portion of unamortized debt issuance costs to long-term debt	$ 2
Other Assets | Rabbi Trust
Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents		$ 6		$ 6
Scitor Holdings, Inc.
Significant Accounting Policies [Line Items]
Definitive agreement to acquire business, Percentage of acquisition						100.00%
Scitor Holdings, Inc. | Rabbi Trust
Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents		10		10
Scitor Holdings, Inc. | Other Assets | Rabbi Trust
Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents		3		3
Scitor Holdings, Inc. | Inventory, Prepaid Expenses and Other Current Assets | Rabbi Trust
Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents		$ 7		$ 7