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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