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Taxes on Earnings - Provision for Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Provision For Taxes [Line Items]      
U.S. federal statutory income tax rate from continuing operations 23.30% 35.00% 35.00%
Remeasurement of deferred assets and liabilities $ 1,200    
Remeasurement of U.S. deferred tax assets expected to be realized 317    
Provisional deemed repatriation tax 3,300    
Deferred tax liability on unremitted earnings 5,600    
Net income tax charges (benefits) (2,800) $ (72) $ 301
Provisional tax benefit 760    
Expected valuation allowance on net expense related to deferred tax assets 317    
Tax benefits related to audit settlements 1,500    
Tax benefits due to release of valuation allowances 601    
Tax charge (benefit) related to other items 34    
Excess tax benefits on stock options, restricted stock and performance share units 42    
Net tax charges (benefits) on restructuring and pension related costs   84 62
Income tax benefit related to acquisition-related charges   45  
Other tax benefit   13 70
Tax charges related to state tax impacts or state rate changes   22  
Income tax benefit for adjustments associated to uncertain tax positions   49 525
Excess tax benefits on stock options, restricted stock and performance share units,   19  
Net tax benefits related to the release of foreign valuation allowances     52
Retroactive research and development credit     41
Income tax benefits, reduced rates for subsidiaries in certain countries $ 578 $ 471 $ 341
Income tax benefits, reduced rates for subsidiaries in certain countries (in dollars per share) $ 0.35 $ 0.28 $ 0.20
Federal      
Provision For Taxes [Line Items]      
Income tax benefit related to provision to return adjustments   $ 12  
State      
Provision For Taxes [Line Items]      
Income tax benefit related to provision to return adjustments   $ (11)