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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense and the Resulting Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock-based compensation expense $ 268 $ 224 $ 182
Income tax benefit (59) (71) (63)
Stock-based compensation expense, net of tax $ 209 $ 153 $ 119