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 | |