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Derivatives and Currency Exchange Risk Management - Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 30, 2020 USD ($) | Oct. 25, 2019 USD ($) | Oct. 30, 2020 USD ($) | Oct. 25, 2019 USD ($) | Apr. 24, 2020 USD ($) | Oct. 30, 2020 EUR (€) | Oct. 30, 2020 JPY (¥)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
After-tax net unrealized gains (losses) associated with cash flow hedging instruments recorded in AOCI | $ (129,000,000) |  | $ (129,000,000) |  | $ 266,000,000 |  |
Cash flow hedge unrealized losses to be reclassified over the next 12 months |  |  | 34,000,000 |  |  |  |
After-tax net unrealized gains (losses) associated with net investment hedging instruments recorded in AOCI |  |  | (1,000,000,000.0) |  | 236,000,000 |  |
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 | $ 0 |  |  |
Currency exchange rate contracts |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Gross notional amount | 18,500,000,000 |  | 18,500,000,000 |  | 11,900,000,000 |  |
Currency exchange rate contracts | Derivatives not designated as hedging instruments |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Gross notional amount | 10,700,000,000 |  | 10,700,000,000 |  | 4,900,000,000 |  |
Currency exchange rate contracts | Derivatives designated as hedging instruments | Cash flow hedging |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Gross notional amount | 7,800,000,000 |  | $ 7,800,000,000 |  | 7,000,000,000.0 |  |
Maximum remaining maturity of foreign currency derivatives |  |  | 3 years |  |  |  |
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedging |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Gross notional amount |  |  |  |  |  | € 16,000,000,000.0 | ¥ 300,000,000,000
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedging | Euro-denominated Debt |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Gross notional amount | 18,900,000,000 |  | $ 18,900,000,000 |  |  |  |
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedging | Japanese Yen-denominated Debt |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Gross notional amount | 2,900,000,000 |  | 2,900,000,000 |  |  |  |
Total return swaps | Derivatives not designated as hedging instruments |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Gross notional amount | $ 197,000,000 |  | $ 197,000,000 |  | $ 181,000,000 |  |

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