The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amortizable Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017	Jan. 28, 2018
Amortizable intangible assets components
Amortization expense	$ 7	$ 13	$ 24	$ 42
Future amortization expense associated with intangible assets
Remainder of fiscal 2019	6		6
Fiscal 2020	21		21
Fiscal 2021	12		12
Fiscal 2022	5		5
Fiscal 2023	4		4
Fiscal 2024	1		1
Acquisition-related intangible assets
Amortizable intangible assets components
Gross Carrying Amount	195		195		$ 195
Accumulated Amortization	(186)		(186)		(180)
Net Carrying Amount	9		9		15
Patents and licensed technology
Amortizable intangible assets components
Gross Carrying Amount	490		490		469
Accumulated Amortization	(450)		(450)		(432)
Net Carrying Amount	40		40		37
Total intangible assets
Amortizable intangible assets components
Gross Carrying Amount	685		685		664
Accumulated Amortization	(636)		(636)		(612)
Net Carrying Amount	$ 49		$ 49		$ 52