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Financial Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Cash equivalents and available-for-sale investments |  |  |
Available-for-sale Debt Securities Gross Unrealized Gains | $ 18 | $ 40 |
Available-for-sale Debt Securities, Gross Unrealized Losses | (1) | (11) |
Available-for-sale securities, Gross Unrealized Gains | 18 | 40 |
Available-for-sale securities, Gross Unrealized Losses | (1) | (11) |
Interest income | 104 | 104 | $ 105
Cost |  |  |
Cash equivalents and available-for-sale investments |  |  |
Cash equivalents | 3,121 | 6,751 |
Available-for-sale securities, Cost | 139 | 220 |
Total cash equivalents and available-for-sale investments | 3,260 | 6,971 |
Fair Value |  |  |
Cash equivalents and available-for-sale investments |  |  |
Cash equivalents | 3,121 | 6,751 |
Available-for-sale Debt Securities Fair Value | 156 | 249 |
Total cash equivalents and available-for-sale investments | 3,277 | 7,000 |
Foreign bonds |  |  |
Cash equivalents and available-for-sale investments |  |  |
Available-for-sale Debt Securities Gross Unrealized Gains | 18 | 40 |
Foreign bonds | Cost |  |  |
Cash equivalents and available-for-sale investments |  |  |
Available-for-sale securities, Cost | 113 | 183 |
Foreign bonds | Fair Value |  |  |
Cash equivalents and available-for-sale investments |  |  |
Available-for-sale Debt Securities Fair Value | 131 | 223 |
Other debt securities |  |  |
Cash equivalents and available-for-sale investments |  |  |
Available-for-sale Debt Securities, Gross Unrealized Losses | (1) | (11) |
Other debt securities | Cost |  |  |
Cash equivalents and available-for-sale investments |  |  |
Available-for-sale securities, Cost | 26 | 37 |
Other debt securities | Fair Value |  |  |
Cash equivalents and available-for-sale investments |  |  |
Available-for-sale Debt Securities Fair Value | 25 | 26 |
Time deposits | Cost |  |  |
Cash equivalents and available-for-sale investments |  |  |
Cash equivalents | 781 | 1,159 |
Time deposits | Fair Value |  |  |
Cash equivalents and available-for-sale investments |  |  |
Cash equivalents | 781 | 1,159 |
Money market funds | Cost |  |  |
Cash equivalents and available-for-sale investments |  |  |
Cash equivalents | 2,340 | 5,592 |
Money market funds | Fair Value |  |  |
Cash equivalents and available-for-sale investments |  |  |
Cash equivalents | $ 2,340 | $ 5,592 |

X
- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates and investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities. + References No definition available. + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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