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Fair Value - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2025 | Apr. 30, 2025 | Apr. 30, 2024 | Oct. 31, 2024
Financial assets and liabilities measured at fair value on a recurring basis |  |  |  |
Impairment | $ 1,400 |  |  |
Measurement Alternative |  |  |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |  |  |
Realized gain (loss) on equity securities |  | $ (2) |  |
Unrealized gain (loss) on equity securities |  |  | $ (7) |
Measurement Alternative | Fair Value, Nonrecurring |  |  |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |  |  |
Cumulative upward price adjustment | 82 | 82 |  |
Cumulative downward price adjustment | 89 | 89 |  |
Fair Value |  |  |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |  |  |
Fair value, short-term and long-term debt | 17,400 | 17,400 |  | $ 18,300
Carrying Value |  |  |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |  |  |
Fair value, short-term and long-term debt | $ 17,500 | $ 17,500 |  | $ 18,200

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