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Stock-Based Compensation - Restricted Stock Units (Narrative) (Details) - Restricted Stock Units - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total grant date fair value of restricted stock awards vested $ 224 $ 162 $ 54
Unrecognized pre-tax stock-based compensation expense related to non-vested restricted stock awards $ 238    
Remaining weighted-average vesting period 1 year 4 months 24 days