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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 |

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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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