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Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions | Jul. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Cash Equivalents: |  |
Cost | $ 2,171 | $ 2,344
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 2,171 | 2,344
Available-for-Sale Investments: |  |
Cost | 113 | 118
Gross Unrealized Gain | 21 | 69
Gross Unrealized Loss | 0 | 0
Fair Value | 134 | 187
Total cash equivalents and available-for-sale investments, cost | 2,284 | 2,462
Total cash equivalents and available-for-sale investments, gross unrealized gain | 21 | 69
Total cash equivalents and available-for-sale investments, gross unrealized loss | 0 | 0
Total cash equivalents and available-for-sale investments, fair value | 2,305 | 2,531
Time deposits |  |
Cash Equivalents: |  |
Cost | 1,773 | 1,012
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 1,773 | 1,012
Government debt |  |
Cash Equivalents: |  |
Cost | 398 | 1,332
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 398 | 1,332
Financial institution instruments |  |
Available-for-Sale Investments: |  |
Debt securities, cost | 3 | 3
Debt securities, gross unrealized gain | 0 | 0
Debt securities, gross unrealized loss | 0 | 0
Debt securities, fair value | 3 | 3
Marketable securities and mutual funds |  |
Available-for-Sale Investments: |  |
Equity securities, cost | 110 | 115
Equity securities, gross unrealized gain | 21 | 69
Equity securities, gross unrealized loss | 0 | 0
Equity securities, fair value | 131 | 184
Marketable securities and mutual funds | Fair Value Measured on a Recurring Basis |  |
Available-for-Sale Investments: |  |
Debt securities, restricted | $ 67 | $ 78

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