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Financial Instruments - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018
Schedule of Investments [Line Items] |  |  |
Credit loss portion of other-than-temporary impairments | $ 0 | $ 0 |
Reductions for available-for-sale securities sold | 0 | 0 |
Impairment charges recognized | 0 | 0 | $ 227,000,000
Carrying value of investments prior to recognizing impairment charges |  |  | 317,000,000
Equity Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Net gains (losses) recognized | (13,000,000) | 104,000,000 |
Net unrealized gains (losses) on equity and other investments still held | (15,000,000) | 10,000,000 |
Net realized gains on equity and other investments sold during the period | 2,000,000 | 94,000,000 |
Impairment charges recognized | $ 4,000,000 | $ 45,000,000 | $ 231,000,000

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- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27405-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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