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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	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/ gain recognized in Accumulated other comprehensive loss on derivatives:		$ (201)
(Loss)/ gain recognized in Accumulated other comprehensive loss on derivatives:			$ 252	$ 341
Total amounts of income/ (expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded		3,462	3,877	3,831
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings		85
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		3,462	3,877	3,831
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings		85
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings	$ 380			(258)
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		56,639	58,756	58,472
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings		108
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings	425			(239)
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		(46,202)	(47,586)	(47,803)
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings		(25)
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings	(43)			(18)
Cash flow hedges \| 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		(6,975)	(7,293)	(6,838)
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings		2
Gain/ (loss) reclassified from Accumulated other comprehensive loss into earnings	$ (2)			(1)
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 derivatives:		(197)
(Loss)/ gain recognized in Accumulated other comprehensive loss on derivatives:			252	341
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 derivatives:		$ (4)
(Loss)/ gain recognized in Accumulated other comprehensive loss on derivatives:			$ 0	$ 0