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

Derivative Assets and Liabilities, Net, Collateral, Obligation to Return Cash

No definition available.

Name:	mdt_DerivativeAssetsandLiabilitiesNetCollateralObligationtoReturnCash
Namespace Prefix:	mdt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant