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Stockholders' Equity - Schedule of Repurchase Agreements (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Shares Repurchase Activity [Line Items] |  |  |  |  |
Amount | $ 464 | $ 334 | $ 1,966 | $ 651 |
Treasury stock value | $ 7 |  | $ 7 |  | $ 0
Open Market |  |  |  |  |
Shares Repurchase Activity [Line Items] |  |  |  |  |
Shares (in shares) |  |  | 335 | 104 |
Amount |  |  | $ 1,966 | $ 651 |

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