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Stockholders' Equity - Schedule of Repurchase Agreements (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Shares Repurchase Activity [Line Items] |  |  |  |  |
Amount | $ 328 | $ 165 | $ 844 | $ 408 |
Treasury stock | $ 7 |  | $ 7 |  | $ 19
Open Market Repurchases |  |  |  |  |
Shares Repurchase Activity [Line Items] |  |  |  |  |
Shares (in shares) |  |  | 138 | 70 |
Amount |  |  | $ 844 | $ 408 |

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