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Stock-Based Compensation - Stock-Based Compensation Expense and Related Income Tax Benefits for Continuing Operations (Narrative) (Details) - 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]      
Pre-tax stock-based compensation expense due to adjustments $ 268 $ 224 $ 182
2011 ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash received from option exercises and purchases 158 118 48
Benefit realized for tax deduction from option exercises $ 23 $ 15 9
Spinoff | Hewlett Packard Enterprise      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pre-tax stock-based compensation expense due to adjustments     $ 2