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Stock-Based Compensation - Employee Stock Purchase Plan (Narrative) (Details) - USD ($)
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense, net of tax $ 230,000,000 $ 250,000,000 $ 209,000,000
2011 ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum employee contribution limit (as a percent) 10.00%    
Stock purchase price (as a percent) 95.00%    
Stock-based compensation expense, net of tax $ 0    
Stock authorized for issuance (in shares) 100,000,000    
2021 ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock authorized for issuance (in shares) 50,000,000