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Fair Value - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Fair Value - Narrative (Details) - USD ($) $ in Millions	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	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
Unrealized gain on equity securities	1	$ 7
Realized loss on equity securities			$ (1)
Measurement Alternative \| Fair Value, Nonrecurring
Financial assets and liabilities measured at fair value on a recurring basis
Cumulative upward price adjustment	83		83
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	23,600		23,600	$ 18,300
Carrying Value
Financial assets and liabilities measured at fair value on a recurring basis
Fair value, short-term and long-term debt	$ 23,700		$ 23,700	$ 18,200