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Derivatives and Foreign Exchange Risk Management - Location and Fair Value Amounts of Derivative Instruments in Balance Sheets (Details) - USD ($) $ in Millions | Oct. 30, 2015 | Apr. 24, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | $ 498 | $ 733
Liability Derivatives, Fair Value | 132 | 116
Interest rate contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 74 | 89
Liability Derivatives, Fair Value | 72 | 71
Foreign currency exchange rate contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 403 | 644
Liability Derivatives, Fair Value | 47 | 45
Commodity derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 9 |
Cross currency interest rate contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 21 |
Liability Derivatives, Fair Value | 4 |
Designated as hedging instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 449 | 614
Liability Derivatives, Fair Value | 95 | 86
Designated as hedging instrument [Member] | Interest rate contracts [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 2 | 10
Designated as hedging instrument [Member] | Interest rate contracts [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 72 | 79
Designated as hedging instrument [Member] | Interest rate contracts [Member] | Other accrued expenses [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 0 | 0
Designated as hedging instrument [Member] | Interest rate contracts [Member] | Other long-term liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 72 | 71
Designated as hedging instrument [Member] | Foreign currency exchange rate contracts [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 286 | 382
Designated as hedging instrument [Member] | Foreign currency exchange rate contracts [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 89 | 143
Designated as hedging instrument [Member] | Foreign currency exchange rate contracts [Member] | Other accrued expenses [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 18 | 12
Designated as hedging instrument [Member] | Foreign currency exchange rate contracts [Member] | Other long-term liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 5 | 3
Not designated as hedging instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 49 | 119
Liability Derivatives, Fair Value | 37 | 30
Not designated as hedging instrument [Member] | Foreign currency exchange rate contracts [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 28 | 119
Not designated as hedging instrument [Member] | Foreign currency exchange rate contracts [Member] | Other accrued expenses [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 24 | $ 30
Not designated as hedging instrument [Member] | Commodity derivatives [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 0 |
Not designated as hedging instrument [Member] | Commodity derivatives [Member] | Other accrued expenses [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 9 |
Not designated as hedging instrument [Member] | Cross currency interest rate contracts [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 21 |
Not designated as hedging instrument [Member] | Cross currency interest rate contracts [Member] | Other long-term liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | $ 4 |

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