Supplementary Financial Information - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Disaggregation of Revenue [Line Items]
Total net revenue	$ 17,028	$ 15,646
Americas
Disaggregation of Revenue [Line Items]
Total net revenue	6,859	6,894
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total net revenue	5,936	5,497
Asia-Pacific and Japan
Disaggregation of Revenue [Line Items]
Total net revenue	$ 4,233	$ 3,255