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Stock-Based Compensation- Employee Stock Purchase Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
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%      
Current offering period 24 months      
Offering period 6 months      
Stock-based compensation expense, net of tax $ 312 $ 227 $ 220  
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