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Fair Value Measurements - Assets Measured at Fair Value (Details) - USD ($) $ in Millions | Apr. 26, 2020 | Oct. 27, 2019 | Apr. 28, 2019
--- | --- | --- | ---
Equity investments with readily determinable values |  |  |
Equity investments with readily determinable values | $ 155 | $ 157 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Restricted cash equivalents included in deferred income taxes and other assets | 115 |  | $ 0
Money market funds* | Deferred Income Taxes and Other Assets, Net |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Restricted cash equivalents included in deferred income taxes and other assets | 115 |  |
U.S. Treasury and agency securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 386 | 337 |
Municipal securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 402 | 406 |
Commercial paper, corporate bonds and medium-term notes |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 557 | 647 |
Asset-backed and mortgage-backed securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 597 | 635 |
Publicly traded equity securities |  |  |
Equity investments with readily determinable values |  |  |
Equity investments with readily determinable values | 38 | 45 |
Recurring fair value measurements |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 6,313 | 4,093 |
Equity investments with readily determinable values |  |  |
Equity investments with readily determinable values | 38 | 45 |
Total assets | 6,351 | 4,138 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Total liabilities | 180 | 0 |
Recurring fair value measurements | Money market funds* |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 4,346 | 1,677 |
Recurring fair value measurements | U.S. Treasury and agency securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 386 | 341 |
Recurring fair value measurements | Non-U.S. government securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 4 | 10 |
Recurring fair value measurements | Municipal securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 401 | 406 |
Recurring fair value measurements | Commercial paper, corporate bonds and medium-term notes |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 579 | 1,024 |
Recurring fair value measurements | Asset-backed and mortgage-backed securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 597 | 635 |
Recurring fair value measurements | Publicly traded equity securities |  |  |
Equity investments with readily determinable values |  |  |
Equity investments with readily determinable values | 38 | 45 |
Recurring fair value measurements | Interest rate contracts |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liability, fair value disclosure | 180 | 0 |
Recurring fair value measurements | Level 1 |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 4,715 | 2,000 |
Equity investments with readily determinable values |  |  |
Equity investments with readily determinable values | 38 | 45 |
Total assets | 4,753 | 2,045 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Total liabilities | 0 | 0 |
Recurring fair value measurements | Level 1 | Money market funds* |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 4,346 | 1,677 |
Recurring fair value measurements | Level 1 | U.S. Treasury and agency securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 369 | 323 |
Recurring fair value measurements | Level 1 | Non-U.S. government securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 0 | 0 |
Recurring fair value measurements | Level 1 | Municipal securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 0 | 0 |
Recurring fair value measurements | Level 1 | Commercial paper, corporate bonds and medium-term notes |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 0 | 0 |
Recurring fair value measurements | Level 1 | Asset-backed and mortgage-backed securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 0 | 0 |
Recurring fair value measurements | Level 1 | Publicly traded equity securities |  |  |
Equity investments with readily determinable values |  |  |
Equity investments with readily determinable values | 38 | 45 |
Recurring fair value measurements | Level 1 | Interest rate contracts |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liability, fair value disclosure | 0 | 0 |
Recurring fair value measurements | Level 2 |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 1,598 | 2,093 |
Equity investments with readily determinable values |  |  |
Equity investments with readily determinable values | 0 | 0 |
Total assets | 1,598 | 2,093 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Total liabilities | 180 | 0 |
Recurring fair value measurements | Level 2 | Money market funds* |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 0 | 0 |
Recurring fair value measurements | Level 2 | U.S. Treasury and agency securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 17 | 18 |
Recurring fair value measurements | Level 2 | Non-U.S. government securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 4 | 10 |
Recurring fair value measurements | Level 2 | Municipal securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 401 | 406 |
Recurring fair value measurements | Level 2 | Commercial paper, corporate bonds and medium-term notes |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 579 | 1,024 |
Recurring fair value measurements | Level 2 | Asset-backed and mortgage-backed securities |  |  |
Assets: |  |  |
Available-for-sale debt security investments | 597 | 635 |
Recurring fair value measurements | Level 2 | Publicly traded equity securities |  |  |
Equity investments with readily determinable values |  |  |
Equity investments with readily determinable values | 0 | 0 |
Recurring fair value measurements | Level 2 | Interest rate contracts |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liability, fair value disclosure | $ 180 | $ 0 |

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