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Class of warrant or right number of securities vested.

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Closing stock price

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Estimate of fair value per warrant.

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Number of vesting annual installments of warrants.

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Number of Vesting Installments

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- Definition

Share-based compensation arrangement by share-based payment award, Board Of Directors, Award Requisite Service Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Term

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Warrants or rights vested expiration date.

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Warrants or rights vested start date.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

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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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Awards - Additional Information (Details)		12 Months Ended
Stock-Based Awards - Additional Information (Details)	Apr. 18, 2019 Installment $ / shares shares	Feb. 01, 2020 USD ($) Installment $ / shares shares	Feb. 02, 2019 USD ($)	Feb. 03, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Authorized \| shares		9,000,000.0
Available for grant \| shares		8,500,000
Number of vesting installments \| Installment		5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value \| $		$ 1,000,000	$ 16,000,000	$ 3,000,000
Stock options exercisable, weighted average remaining contractual life		10 months 24 days
Stock options exercisable, intrinsic value \| $		$ 0
Closing stock price \| $ / shares		$ 42.75
Aggregate fair value of awards at the time of vesting \| $		$ 50,000,000	57,000,000	40,000,000
Total share-based compensation expense \| $		56,000,000	$ 87,000,000	$ 55,000,000
Total unrecognized share-based compensation expense for al share-based payment plans \| $		$ 89,000,000
Weighted average period, years		1 year 3 months 18 days
Amazon [Member] \| Commercial Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares to be purchased warrants \| shares	1,747,441
Exercise price of warrants \| $ / shares	$ 69.68
Estimated of fair value per warrant \| $ / shares	$ 17.52
Warrants, number of vesting annual installments \| Installment	5
Warrants vest, beginning date	Jan. 15, 2020
Number of shares to be purchased warrants,vested \| shares		349,489
Number of shares to be purchased warrants, Unvested \| shares		1,397,952
Warrants vest, expiration date	Apr. 18, 2026
Non Vested Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
General term of a elected director, years		5 years
Vesting term, years		1 year
After 2005 [Member] \| Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of options granted, years		7 years
Prior 2006 [Member] \| Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of options granted, years		15 years
Director [Member] \| Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of options granted, years		10 years