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Derivatives and Currency Exchange Risk Management - Narrative (Details) € in Billions | 12 Months Ended |
--- | --- | ---
Apr. 24, 2020 USD ($) derivative | Apr. 26, 2019 USD ($) | Apr. 27, 2018 USD ($) | Apr. 24, 2020 EUR (€) derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
After-tax net unrealized gains (losses) associated with cash flow hedging instruments recorded in AOCI | $ 266,000,000 | $ 194,000,000 |  |
Cash flow hedge unrealized gains to be reclassified over the next twelve months | 225,000,000 |  |  |
Face value of debt | 24,500,000,000 | 25,000,000,000.0 |  |
Gains (losses) on firm commitments that no longer qualify as fair value hedges | 0 | 0 | $ 0 |
After-tax net unrealized gains (losses) associated with net investment hedging instruments recorded in AOCI | 236,000,000 | (169,000,000) |  |
Net investment hedge unrealized gains or losses to be reclassified over the next twelve months, net of tax | 0 |  |  |
Gains (losses) on firm commitments that no longer qualify as net investment hedges | 0 | 0 | $ 0 |
Net cash collateral received | $ 48,000,000 | 44,000,000 |  |
4.125 percent ten-year 2011 senior notes | Senior Notes |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Face value of debt |  | $ 500,000,000 |  |
Stated interest rate | 4.125% | 4.125% |  | 4.125%
3.125 percent ten-year 2012 senior notes | Senior Notes |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Face value of debt |  | $ 675,000,000 |  |
Stated interest rate | 3.125% | 3.125% |  | 3.125%
Currency exchange rate contracts |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gross notional amount | $ 11,900,000,000 | $ 11,100,000,000 |  |
Currency exchange rate contracts | Derivatives not designated as hedging instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gross notional amount | 4,900,000,000 | 4,300,000,000 |  |
Currency exchange rate contracts | Derivatives designated as hedging instruments | Cash flow hedges |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gross notional amount | $ 7,000,000,000.0 | 6,800,000,000 |  |
Maximum remaining maturity of foreign currency derivatives | 3 years |  |  |
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedges |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gross notional amount | $ 13,000,000,000.0 |  |  | € 12.0
Total return swaps | Derivatives not designated as hedging instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gross notional amount | $ 181,000,000 | 191,000,000 |  |
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedges |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gross notional amount |  | 1,200,000,000 |  |
Number of interest rate swaps outstanding | derivative | 0 |  |  | 0
Market value of outstanding interest rate swap agreements - net unrealized gain |  | 9,000,000 |  |
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedges | 4.125 percent ten-year 2011 senior notes | Senior Notes |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Face value of debt |  | $ 500,000,000 |  |
Stated interest rate |  | 4.125% |  |
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedges | 3.125 percent ten-year 2012 senior notes | Senior Notes |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Face value of debt |  | $ 675,000,000 |  |
Stated interest rate |  | 3.125% |  |

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