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Financial Instruments - Activity Related to the Company's Investment Portfolio, Equity and Other Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 30, 2020 | Oct. 25, 2019 | Oct. 30, 2020 | Oct. 25, 2019
Marketable Securities [Line Items] |  |  |  |
Proceeds from sales |  |  | $ 4,337,000,000 | $ 3,260,000,000
Impairment losses recognized | $ 0 |  |  |
Equity and Other Investments |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Proceeds from sales | 2,000,000 | $ 0 | 2,000,000 | 2,000,000
Gross gains | 2,000,000 | 14,000,000 | 14,000,000 | 14,000,000
Gross losses | (2,000,000) | 0 | (2,000,000) | 0
Impairment losses recognized | $ 0 | $ (2,000,000) | $ (2,000,000) | $ (3,000,000)

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- Definition Loss on Investments + References No definition available. + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562 + Details
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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. + References No definition available. + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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