Derivatives and Currency Exchange Risk Management - Amount of Gains (Losses) Recognized in Consolidated Statements of Income, Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Oct. 25, 2019	Oct. 26, 2018	Oct. 25, 2019	Oct. 26, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Other operating expense, net	$ 149	$ 70	$ 127	$ 221
Cash flow hedging \| 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	$ 68		$ 125
Amount of gain (loss) reclassified from AOCI into income		$ 11		$ 8

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 4D
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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
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