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Fair Value (Details) - USD ($) $ in Millions | Oct. 31, 2018 | Oct. 31, 2017
--- | --- | ---
Fair Value and Carrying Value of Debt |  |
Fair value, short- and long-term debt | $ 12,200 | $ 14,600
Carrying value, short- and long-term debt | 12,100 | 14,000
Fair Value, Measurements, Recurring | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 3,773 | 7,260
Total liabilities | 476 | 477
Fair Value, Measurements, Recurring | Time deposits | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 781 | 1,159
Fair Value, Measurements, Recurring | Money market funds | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 2,340 | 5,592
Fair Value, Measurements, Recurring | Foreign bonds | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 131 | 223
Fair Value, Measurements, Recurring | Other debt securities | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 25 | 26
Fair Value, Measurements, Recurring | Foreign currency contracts | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 496 | 259
Total liabilities | 117 | 335
Fair Value, Measurements, Recurring | Other derivatives | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 0 | 1
Total liabilities | 6 | 0
Fair Value, Measurements, Recurring | Interest rate contracts | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total liabilities | 353 | 142
Fair Value, Measurements, Recurring | Level 1 |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 2,347 | 5,601
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 2,340 | 5,592
Fair Value, Measurements, Recurring | Level 1 | Foreign bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 7 | 9
Fair Value, Measurements, Recurring | Level 2 |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 1,401 | 1,633
Total liabilities | 476 | 477
Fair Value, Measurements, Recurring | Level 2 | Time deposits |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 781 | 1,159
Fair Value, Measurements, Recurring | Level 2 | Foreign bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 124 | 214
Fair Value, Measurements, Recurring | Level 2 | Foreign currency contracts |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 496 | 259
Total liabilities | 117 | 335
Fair Value, Measurements, Recurring | Level 2 | Other derivatives |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 0 | 1
Total liabilities | 6 | 0
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total liabilities | 353 | 142
Fair Value, Measurements, Recurring | Level 3 |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | 25 | 26
Fair Value, Measurements, Recurring | Level 3 | Other debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total assets | $ 25 | $ 26

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