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Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative	$ (21)	$ 231	$ (387)	$ 291
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	1,362	826	2,683	1,691
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	(149)	53	(198)	112
Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	1,362	826	2,683	1,691
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	(149)	53	(198)	112
Cash flow hedges | Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	15,877	12,469	31,523	27,087
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	(146)	62	(189)	123
Cash flow hedges | Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	(12,437)	(9,976)	(24,759)	(21,722)
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	(4)	(10)	(10)	(11)
Cash flow hedges | Other operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	(2,078)	(1,667)	(4,081)	(3,674)
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	1	1	1	0
Foreign currency contracts | Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative	(21)	239	(387)	299
Interest rate contracts | Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative	$ 0	$ (8)	$ 0	$ (8)

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The net result for the period of deducting operating expenses from operating revenues.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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