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Taxes on Earnings (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2021
USD ($)
country
Apr. 30, 2020
USD ($)
Apr. 30, 2021
USD ($)
country
Apr. 30, 2020
USD ($)
Income Tax Disclosure [Abstract]        
Effective tax rate (percent) 8.10% 7.60% 12.70% 15.40%
Net tax benefit $ 128 $ 59 $ 129 $ 66
Tax benefits related to intra-entity asset transfer 89   89  
Tax benefits related to restructuring charges 8 7 36 55
Tax benefits related to audit settlements 23 42 11 40
Tax benefits related to other items 12   5  
Tax benefits related to acquisition charges   11   17
Uncertain tax position charges 4 3 12 51
Unrecognized tax benefits 815   815  
Unrecognized tax benefits that would affect effective tax rate if realized 645   645  
Unrecognized tax benefits change     5  
Accrued income tax payable for interest and penalties 66 $ 29 $ 66 $ 29
Likelihood of no resolution period     12 months  
Reasonably possible decrease in existing unrecognized tax benefits within the next 12 months $ 108   $ 108  
Other countries with income tax jurisdiction | country 60   60