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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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