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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 | Apr. 24, 2020 | Apr. 26, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | $ 402 | $ 365
Derivative Liabilities | 42 | 19
Currency exchange rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 399 | 335
Derivative Liabilities | 17 | 19
Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets |  | 9
Total return swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets |  | 15
Derivative Liabilities | 25 |
Cross-currency interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 3 | 6
Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 374 | 321
Derivative Liabilities | 4 | 2
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 271 | 234
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 103 | 78
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 2 | 1
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 2 | 1
Derivatives designated as hedging instruments | Interest rate contracts | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets |  | 9
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities |  | 0
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 28 | 44
Derivative Liabilities | 38 | 17
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 25 | 23
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 13 | 17
Derivatives not designated as hedging instruments | Total return swaps | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 0 | 15
Derivatives not designated as hedging instruments | Total return swaps | Other accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 25 | 0
Derivatives not designated as hedging instruments | Cross-currency interest rate contracts | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 3 | 6
Derivatives not designated as hedging instruments | Cross-currency interest rate contracts | Other accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | $ 0 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
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