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Taxes on Earnings - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Oct. 31, 2020
Income Tax Examination [Line Items]          
Effective tax rate (as a percent) 10.10% 9.90% 2.20% 8.40%  
Net income tax benefits $ 33 $ 151 $ 124 $ 167  
Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges 41 48 107 48  
Tax rate changes     30    
Pre-Separation tax matters   35   56  
Unrecognized tax benefits 2,100   2,100   $ 2,200
Unrecognized tax benefits that would affect effective tax rate if realized 704   704   731
Accrued income tax for interest and penalties 122   $ 122   $ 119
Likelihood of no resolution period     12 months    
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months $ 50   $ 50    
Foreign Tax Authority | India          
Income Tax Examination [Line Items]          
Tax rate changes   $ 57   $ 57