Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jan. 30, 2015

Accounting Policies [Abstract]

Separation Transaction Expenses

	Year Ended
	January 30, 2015			January 31, 2014			January 31, 2013
	(in millions)
Strategic advisory services	$	—		$	7		$	1
Legal and accounting services	—			2			—
Lease termination and facility consolidation expenses	3			46			2
Severance costs	—			10			8
Separation transaction and restructuring expenses in operating (loss) income	3			65			11
Less: income tax benefit	(1		)	(25		)	(4		)
Separation transaction and restructuring expenses, net of tax	$	2		$	40		$	7

Schedule of Restructuring Reserve

The following table represents the restructuring liability balance as of January 30, 2015 and summarizes the changes during the period attributable to costs incurred and charged to expense, costs paid or otherwise settled, and any adjustments to the liability:

	Severance Costs			Lease Termination and Facility Consolidation Expenses			Total
	(in millions)
Balance as of January 31, 2013	$	8		$	2		$	10
Charges	10			41			51
Cash payments	(17		)	(23		)	(40		)
Balance as of January 31, 2014	$	1		$	20		$	21
Charges	—			3			3
Cash payments	(1		)	(12		)	(13		)
Balance as of January 30, 2015	$	—		$	11		$	11

Schedule of Depreciation using Estimated Useful Lives

Depreciation is recognized using the methods and estimated useful lives as follows:

	Depreciation method	Estimated useful lives (in years)
Computers and other equipment	Straight-line or declining-balance	2-10
Buildings	Straight-line	30-40
Building improvements and leasehold improvements	Straight-line	Shorter of lease term or 25
Office furniture	Straight-line or declining-balance	6-9
Electric generation facility	Straight-line	25

Property, plant, and equipment, net consisted of the following:

	January 30, 2015			January 31, 2014
	(in millions)
Electric generation facility	$	127		$	269
Computers and other equipment	166			204
Leasehold improvements	156			167
Buildings and improvements	107			113
Office furniture and fixtures	37			43
Land	26			27
Construction in progress	2			—
	621			823
Less accumulated depreciation and amortization	(313		)	(341		)
	$	308		$	482

Schedule of Finite-Lived Intangible Assets

Intangible assets with finite lives are being amortized over the following periods:

	Estimated useful lives (in years)
Customer relationships	5-10
Software and technology	9-15
Other	5