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Stockholders' Equity - Accelerated Share Repurchase Agreements (Details) - USD ($) shares in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 18, 2019 | Nov. 03, 2019 | Nov. 18, 2019 | Nov. 03, 2019 | Nov. 03, 2019 | Oct. 28, 2018
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Agreement Amount |  |  |  |  | $ 3,909 | $ 5,518
Q3 Accelerated Share Repurchase Agreement |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Agreement Amount |  |  |  | $ 820 |  |
Shares repurchased |  |  |  | 3.2 |  |
Treasury stock value |  |  |  | $ 720 |  |
Subsequent Event | Q3 Accelerated Share Repurchase Agreement |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased | 0.4 |  | 3.6 |  |  |
Paid-in Capital | Q3 Accelerated Share Repurchase Agreement |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Treasury stock value |  | $ 100 |  |  |  |

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