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Stock-Based Compensation - Weighted-Average Fair Value and Assumptions Used to Measure Fair Value of Stock Options (Details) - Stock Options - $ / shares
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value (in dollars per share) $ 5 $ 4 $ 4
Expected volatility (as a percent) 29.40% 28.00% 36.20%
Risk-free interest rate (as a percent) 2.50% 1.90% 1.80%
Expected dividend yield (percent) 2.60% 2.80% 3.50%
Expected performance period 5 years 5 years 6 months 6 years
Historical volatility 50.00%    
Implied volatility 50.00%