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Derivatives and Currency Exchange Risk Management - Classification and Fair Value Amounts of Derivative Instruments in Balance Sheets (Details) - USD ($) $ in Millions | Jul. 28, 2017 | Apr. 28, 2017
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Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | $ 159 | $ 262
Liability Derivatives, Fair Value | 278 | 104
Currency exchange rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 107 | 216
Liability Derivatives, Fair Value | 268 | 93
Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 41 | 41
Total return swap |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 6 |
Cross currency interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 5 | 5
Liability Derivatives, Fair Value | 10 | 11
Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 126 | 241
Liability Derivatives, Fair Value | 200 | 57
Derivatives designated as hedging instruments | Currency exchange rate contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 60 | 152
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 25 | 48
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 124 | 43
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 76 | 14
Derivatives designated as hedging instruments | Interest rate contracts | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 41 | 41
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 0 | 0
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 33 | 21
Liability Derivatives, Fair Value | 78 | 47
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 22 | 16
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 68 | 36
Derivatives not designated as hedging instruments | Total return swap | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 6 |
Derivatives not designated as hedging instruments | Total return swap | Other accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 0 |
Derivatives not designated as hedging instruments | Cross currency interest rate contracts | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 5 | 5
Derivatives not designated as hedging instruments | Cross currency interest rate contracts | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | $ 10 | $ 11

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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