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Derivatives and Currency Exchange Risk Management - Amount of (Gains) Losses Recognized in Consolidated Statements of Income, Cash Flow Hedges (Details) - USD ($) $ in Millions | 12 Months Ended
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Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Other operating expense, net | $ 71 | $ 258 | $ 535
Cash flow hedges | Currency exchange rate contracts | Other operating expense, net |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Amount of (gain) loss reclassified from AOCI into income | $ (335) |  |
Amount of (gain) loss reclassified from AOCI into income |  | $ (108) | $ 69

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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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