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Derivatives and Currency Exchange Risk Management , Credit Risk and Other Disclosures (Details) - USD ($) $ in Millions | Apr. 28, 2017 | Apr. 29, 2016
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Net cash collateral posted (received) | $ (60) | $ 25

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- Definition Derivative Assets and Liabilities, Net, Collateral, Obligation to Return Cash + References No definition available. + Details
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Namespace Prefix: | mdt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration