Stock Purchase and Award Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Apr. 24, 2020	Apr. 26, 2019
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Vesting period	4 years
Unrecognized compensation expense related to outstanding stock options	$ 61
Weighted average period over which unrecognized compensation is expected to be recognized	2 years 6 months
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	0
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Awards outstanding (in shares)	7,625,000	7,996,000
Weighted average period over which unrecognized compensation is expected to be recognized	2 years 6 months
Unrecognized compensation expense related to restricted stock awards	$ 353
Performance-based restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The discount rate from market value on purchase date	15.00%
Minimum employee contribution rate	2.00%
Maximum employee contribution rate	10.00%
Purchase price of common stock as a percentage of its fair market value	85.00%
Shares purchased by employees (in shares)	2,000,000
Average purchase price (in dollars per share)	$ 86.34
Amount withheld to purchase common stock	$ 14
Shares available for future purchase (in shares)	11,000,000
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants (in shares)	41,000,000

Average purchase price of stock purchased under employee stock purchase plan.

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Number of shares available for future purchase under employee stock purchase plan.

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Number of shares by employees under employee stock purchase plans.

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The withhold amount from employees' payroll to purchase stocks under employee stock purchase plan.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Minimum Employee Subscription Rate

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option 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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Discount rate from fair value on purchase date that participants pay for shares.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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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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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

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