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Taxes on Earnings - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Oct. 31, 2019
Income Tax Disclosure [Abstract]      
Effective tax rate (as a percent) 11.90% 73.00%  
Net income tax charges (benefits) $ (16) $ 428  
Pre-Separation tax matters 21 34  
Income tax benefit from U.S. tax reform   375  
Income tax charges related to future withholding costs on intercompany distributions   37  
Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges   30  
Unrecognized tax benefits 2,200   $ 2,300
Unrecognized tax benefits that would affect effective tax rate if realized 730   772
Interest (income) expense (5) $ 25  
Accrued income tax for interest and penalties $ 124   $ 129
Likelihood of no resolution period 12 months    
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months $ 84    
Likelihood of conclusion period for certain federal, foreign and state tax issues 12 months