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Derivatives and Currency Exchange Risk Management - (Gains) Losses Recognized in AOCI, Cash Flow Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Oct. 30, 2020 | Oct. 25, 2019 | Oct. 30, 2020 | Oct. 25, 2019
Currency exchange rate contracts | Cash flow hedging |  |  |  |
Derivative Instruments, (Gain) Loss [Line Items] |  |  |  |
Recognized in AOCI, Cash flow hedges | $ 63 | $ (76) | $ 451 | $ (103)

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