Dispositions - (Operating Results Classified as Discontinued Operations) (Detail) - USD ($) $ in Millions	3 Months Ended		11 Months Ended		12 Months Ended
	Oct. 31, 2014	Aug. 01, 2014	Jan. 01, 2016	Jan. 02, 2015	Jan. 30, 2015	Jan. 31, 2014
Discontinued Operation
Intangible asset impairment	$ 17	$ 24	$ 4		$ 41	$ 51
Separation transaction and restructuring expenses			4	$ 1	3	65
(Loss) income from discontinued operations before income taxes			(1)	$ (14)	(13)	140
SAIC
Discontinued Operation
Revenues			17		39	2,712
Cost of revenues			17		39	2,447
Selling, general and administrative expenses			0		0	42
Separation transaction and restructuring expenses			0		0	55
Operating income			0		0	168
Other Disposals
Discontinued Operation
Revenues			0		29	33
Cost of revenues			0		21	33
Selling, general and administrative expenses			2		29	25
Intangible asset impairment			0		3	2
Operating income			(2)		(24)	(27)
Nonoperating Income (Expense)			1		11	(1)
(Loss) income from discontinued operations before income taxes			$ (1)		$ (13)	$ (28)