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Stockholders’ Deficit - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 19, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Stockholders' Equity Note [Abstract] |  |  |  |
Dividends (in dollars per share) |  | $ 0.56 | $ 0.53 | $ 0.50
Repurchases of common stock (in shares) |  | 111.0 | 80.0 | 100.0
Payment in connection with repurchases of shares |  | $ 2,557 | $ 1,412 | $ 1,161
Share repurchases that will be settled in subsequent period (shares) |  | 1.0 | 1.5 |
Share repurchase increase in authorization | $ 4,000 |  |  |
Share repurchase authorization remaining |  | $ 3,900 |  |

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