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Supplementary Financial Information - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Disaggregation of Revenue [Line Items]
Total net revenue	$ 15,877	$ 12,469	$ 31,523	$ 27,087
Americas
Disaggregation of Revenue [Line Items]
Total net revenue	6,846	5,205	13,740	11,164
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total net revenue	5,766	4,654	11,263	9,886
Asia-Pacific and Japan
Disaggregation of Revenue [Line Items]
Total net revenue	$ 3,265	$ 2,610	$ 6,520	$ 6,037

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