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Supplementary Financial Information - Disaggregation of revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2023
Apr. 30, 2022
Disaggregation of Revenue [Line Items]        
Total net revenue $ 12,913 $ 16,490 $ 26,741 $ 33,518
Americas        
Disaggregation of Revenue [Line Items]        
Total net revenue 5,452 6,903 11,225 13,762
Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total net revenue 4,388 6,022 9,028 11,958
Asia-Pacific and Japan        
Disaggregation of Revenue [Line Items]        
Total net revenue $ 3,073 $ 3,565 $ 6,488 $ 7,798