Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments and Related Hedged Items in a Fair Value Hedging Relationship (Details) - Interest rate contracts - Income Statement Location [Axis]: us-gaap:NonoperatingIncomeExpense - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized in earnings on derivative instruments	$ 0	$ 2	$ 1	$ 17
Gain/(loss) recognized in earnings on hedged item	$ 0	$ (2)	$ (1)	$ (17)

Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments and Related Hedged Items in a Fair Value Hedging Relationship (Details) - Interest rate contracts - Income Statement Location [Axis]: us-gaap:NonoperatingIncomeExpense - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Jul. 31, 2026

Jul. 31, 2025

Jul. 31, 2026

Jul. 31, 2025

Derivative Instruments, Gain (Loss) [Line Items]

Gain/(loss) recognized in earnings on derivative instruments

$ 0

$ 2

$ 1

$ 17

Gain/(loss) recognized in earnings on hedged item

$ 0

$ (2)

$ (1)

$ (17)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details