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Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions | Jan. 31, 2019 | Oct. 31, 2018
--- | --- | ---
Cash Equivalents: |  |
Cost | $ 2,397 | $ 3,996
Fair Value | 2,397 | 3,996
Available-for-Sale Investments: |  |
Total cash equivalents and available-for-sale investments, Cost | 2,867 | 4,752
Total cash equivalents and available-for-sale investments, Fair Value | 2,876 | 4,760
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | 470 | 756
Debt Securities, Trading, and Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax | 11 | 11
Debt Securities, Trading, and Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax | (2) | (3)
Debt Securities, Trading, and Equity Securities, FV-NI | 479 | 764
Cash Equivalents and Available For Sale Securities, Accumulated Gross Unrealized Gain, before Tax | 11 | 11
Cash Equivalents and Available For Sale Securities, Accumulated Gross Unrealized Loss, before Tax | (2) | (3)
Corporate debt |  |
Cash Equivalents: |  |
Cost | 937 | 1,620
Fair Value | 937 | 1,620
Available-for-Sale Investments: |  |
Debt Securities, Available-for-sale, Amortized Cost | 185 | 368
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1) | (2)
Debt Securities, Available-for-sale | 184 | 366
Financial institution instruments |  |
Cash Equivalents: |  |
Cost | 0 | 9
Fair Value | 0 | 9
Available-for-Sale Investments: |  |
Debt Securities, Available-for-sale, Amortized Cost | 10 | 32
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | 10 | 32
Government debt |  |
Cash Equivalents: |  |
Cost | 1,460 | 2,367
Fair Value | 1,460 | 2,367
Available-for-Sale Investments: |  |
Debt Securities, Available-for-sale, Amortized Cost | 232 | 314
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1) | (1)
Debt Securities, Available-for-sale | 231 | 313
Marketable equity securities |  |
Available-for-Sale Investments: |  |
Equity Securities, FV-NI, Cost | 4 | 4
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax | 2 | 2
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Equity Securities, FV-NI | 6 | 6
Mutual funds |  |
Available-for-Sale Investments: |  |
Debt Securities, Available-for-sale, Amortized Cost | 39 | 38
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 9 | 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | $ 48 | $ 47

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