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Stockholders' Deficit - Narrative (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jun. 19, 2018 | Feb. 28, 2019 | Feb. 28, 2018 | Jan. 31, 2019 | Jan. 31, 2018
Stockholders' Equity Note [Abstract] |  |  |  |  |
Repurchases of common stock (shares) |  |  |  | 32.0 | 20.0
Payment in connection with repurchases of shares |  |  |  | $ 720 | $ 462
Subsequent Event [Line Items] |  |  |  |  |
Share repurchases that will be settled in subsequent period (shares) |  |  | 0.6 |  |
Share repurchase increase in authorization | $ 4,000 |  |  |  |
Share repurchase authorization remaining |  |  |  | $ 3,200 |
Subsequent event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Share repurchases that will be settled in subsequent period (shares) |  | 0.9 |  |  |

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