New Revenue Accounting Standard (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 27, 2019	Jan. 28, 2018
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance, deferred revenue	$ 63
Deferred revenue added during the period	344
Revenue recognized during the period	(269)
Ending balance, deferred revenue	138
Remaining performance obligation	305
Calculated under Revenue Guidance in Effect before Topic 606
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance, deferred revenue	68
New revenue standard
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect on retained earnings		$ 7
New revenue standard \| Difference between Revenue Guidance in Effect before and after Topic 606
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance, deferred revenue	$ (5)

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

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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 of transaction price allocated to performance obligation that has not been recognized as revenue.

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