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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Shares Repurchase Activity [Line Items] |  |  |  |  |
Amount | $ 486 | $ 464 | $ 894 | $ 1,966 |
Treasury stock | $ (24) |  | $ (24) |  | $ 0
Open Market Repurchases |  |  |  |  |
Shares Repurchase Activity [Line Items] |  |  |  |  |
Shares (in shares) |  |  | 156 | 335 |
Amount |  |  | $ 894 | $ 1,966 |

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