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Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions | Apr. 30, 2021 | Oct. 31, 2020
--- | --- | ---
Cash Equivalents: |  |
Cost | $ 2,305 | $ 3,932
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 2,305 | 3,932
Available-for-Sale Investments: |  |
Cost | 56 | 316
Gross Unrealized Gain | 19 | 16
Gross Unrealized Loss | 0 | 0
Fair Value | 75 | 332
Total cash equivalents and available-for-sale investments, Cost | 2,361 | 4,248
Total cash equivalents and available-for-sale investments, Gross Unrealized Gain | 19 | 16
Total cash equivalents and available-for-sale investments, Gross Unrealized Loss | 0 | 0
Total cash equivalents and available-for-sale investments, Fair Value | 2,380 | 4,264
Corporate debt |  |
Cash Equivalents: |  |
Cost | 1,374 | 1,700
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 1,374 | 1,700
Available-for-Sale Investments: |  |
Debt securities, Cost | 0 | 169
Debt securities, Gross Unrealized Gain | 0 | 0
Debt securities, Gross Unrealized Loss | 0 | 0
Debt securities, fair value | 0 | 169
Financial institution instruments |  |
Cash Equivalents: |  |
Cost | 0 | 59
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 0 | 59
Available-for-Sale Investments: |  |
Debt securities, Cost | 12 | 32
Debt securities, Gross Unrealized Gain | 0 | 0
Debt securities, Gross Unrealized Loss | 0 | 0
Debt securities, fair value | 12 | 32
Government debt |  |
Cash Equivalents: |  |
Cost | 931 | 2,173
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 931 | 2,173
Available-for-Sale Investments: |  |
Debt securities, Cost | 0 | 73
Debt securities, Gross Unrealized Gain | 0 | 0
Debt securities, Gross Unrealized Loss | 0 | 0
Debt securities, fair value | 0 | 73
Mutual funds |  |
Available-for-Sale Investments: |  |
Equity securities, Cost | 44 | 42
Equity securities, Gross Unrealized Gain | 19 | 16
Equity securities, Gross Unrealized Loss | 0 | 0
Equity securities, Fair Value | $ 63 | $ 58

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