Amortizable Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 28, 2019	Apr. 29, 2018	Jan. 27, 2019
Amortizable intangible assets components
Amortization expense	$ 7	$ 11
Future amortization expense associated with intangible assets
Remainder of fiscal 2020	18
Fiscal 2021	17
Fiscal 2022	9
Fiscal 2023	7
Fiscal 2024	3
Acquisition-related intangible assets
Amortizable intangible assets components
Gross Carrying Amount	195		$ 195
Accumulated Amortization	(188)		(188)
Net Carrying Amount	7		7
Patents and licensed technology
Amortizable intangible assets components
Gross Carrying Amount	507		491
Accumulated Amortization	(460)		(453)
Net Carrying Amount	47		38
Total intangible assets
Amortizable intangible assets components
Gross Carrying Amount	702		686
Accumulated Amortization	(648)		(641)
Net Carrying Amount	$ 54		$ 45

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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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