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Investments, Marketable Securities, Credit Losses on and Maturities of Debt Securities (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jan. 23, 2015
Apr. 25, 2014
Long-term    
Investments $ 13,917us-gaap_ShortTermInvestments $ 12,838us-gaap_ShortTermInvestments
Long-term investments 615us-gaap_LongTermInvestments 821us-gaap_LongTermInvestments
Credit Loss Portion of Other-than-temporary Impairments on Debt Securities    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 4us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 4us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
AFS Debt Maturities    
Due in one year or less 1,631us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years 6,487us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years 2,847us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 169us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total debt securities 11,134us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Investments    
Long-term    
Available-for-sale securities, fair value 13,843us-gaap_AvailableForSaleSecurities
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12,771us-gaap_AvailableForSaleSecurities
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Trading securities, fair value 74us-gaap_TradingSecurities
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67us-gaap_TradingSecurities
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Investments Other than Available-for-sale and Trading Securities 0mdt_InvestmentsOtherThanAvailableForSaleAndTradingSecurities
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0mdt_InvestmentsOtherThanAvailableForSaleAndTradingSecurities
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Other Assets    
Long-term    
Available-for-sale securities, fair value 157us-gaap_AvailableForSaleSecurities
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155us-gaap_AvailableForSaleSecurities
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Trading securities, fair value 0us-gaap_TradingSecurities
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0us-gaap_TradingSecurities
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Investments Other than Available-for-sale and Trading Securities 458mdt_InvestmentsOtherThanAvailableForSaleAndTradingSecurities
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666mdt_InvestmentsOtherThanAvailableForSaleAndTradingSecurities
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Available for Sale Securities    
Long-term    
Available-for-sale securities, fair value 50us-gaap_AvailableForSaleSecurities
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49us-gaap_AvailableForSaleSecurities
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Other Expense, Net    
AFS Debt Maturities    
Impairment charges, marketable equity investments $ 7us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
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