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Stock-Based Compensation (Details 3) - USD ($)
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Nov. 01, 2015
Share-based compensation        
Common stock, authorized (shares) 9,600,000,000 9,600,000,000    
Maximum contribution limit as percentage of base compensation (as a percent) 15.00%      
Offering period 6 months      
Current offering period 24 months      
Stock-based compensation expense, net of tax $ 253,000,000 $ 295,000,000 $ 277,000,000  
Employee Stock Purchase Plan        
Share-based compensation        
Common stock, authorized (shares)       80,000,000
Maximum contribution limit as percentage of base compensation (as a percent) 10.00%      
Stock purchase price as a percentage of the fair market value on the purchase date 95.00%      
Stock-based compensation expense, net of tax $ 0      
Cash received from option exercises and purchases 279,000,000 411,000,000 119,000,000  
Benefit realized for the tax deduction from option exercises of share-based payment awards 61,000,000 $ 69,000,000 $ 21,000,000  
Stock Options        
Share-based compensation        
Unrecognized pre-tax stock-based compensation expense $ 7,000,000