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Financial Instruments - Contractual Maturities of Investments in Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2025 | Apr. 30, 2025 | Apr. 30, 2024 | Oct. 31, 2024
Amortized Cost |  |  |  |
Due in more than five years | $ 114 | $ 114 |  |
Fair Value |  |  |  |
Due in more than five years | 116 | 116 |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Decrease) in equity securities, FV-NI | 38 | 38 |  |
Fair Value |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity securities without readily determinable fair value, amount | 54 | 54 |  | $ 88
Realized gain (loss) on equity securities | 1 | 1 |  |
Unrealized gain (loss) on equity securities |  | 4 | $ (54) |
Gain on equity securities |  | 5 |  |
Measurement Alternative |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity securities without readily determinable fair value, amount | $ 197 | 197 |  | $ 200
Realized gain (loss) on equity securities |  | $ (2) |  |
Unrealized gain (loss) on equity securities |  |  | $ (7) |

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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