Supplementary Financial Information - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Disaggregation of Revenue [Line Items]
Total net revenue	$ 16,490	$ 15,877	$ 33,518	$ 31,523
Americas
Disaggregation of Revenue [Line Items]
Total net revenue	6,903	6,846	13,762	13,740
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total net revenue	6,022	5,766	11,958	11,263
Asia-Pacific and Japan
Disaggregation of Revenue [Line Items]
Total net revenue	$ 3,565	$ 3,265	$ 7,798	$ 6,520