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Stockholders' Deficit - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 20, 2020 | Aug. 31, 2020 | Aug. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Feb. 22, 2020
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |
Repurchases of common stock (shares) |  |  |  | 59,000,000 | 26,000,000 | 97,000,000 | 92,000,000 |
Payment in connection with repurchases of shares |  |  |  | $ 1,000,000,000.0 | $ 500,000,000 | $ 1,767,000,000 | $ 1,944,000,000 |
Authorized repurchase amount |  |  |  |  |  |  |  | $ 15,000,000,000.0
Share repurchase authorization remaining |  |  |  | $ 14,000,000,000.0 |  | $ 14,000,000,000.0 |  |
Common stock dividends, preferred share purchase right declared (in shares) | 1 |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Shares settled (in shares) |  |  | 700,000 |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Shares settled (in shares) |  | 2,800,000 |  |  |  |  |  |

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