Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships Included in Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	$ (18)	$ (202)	$ (119)	$ (11)
Cash flow hedges:
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	(18)	(202)	(119)	(11)
Cash flow hedges: \| Income Statement Location [Axis]: us-gaap:CostOfRevenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	(13)	(21)	(37)	(71)
Cash flow hedges: \| Income Statement Location [Axis]: us-gaap:CostsAndExpenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	3	0	7	1
Cash flow hedges: \| Income Statement Location [Axis]: us-gaap:NonoperatingIncomeExpense
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	4	3	12	9
Cash flow hedges: \| Income Statement Location [Axis]: us-gaap:Revenues
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	$ (12)	$ (184)	$ (101)	$ 50