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Stockholders' Equity - Schedule of Repurchase Agreements (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Shares Repurchase Activity [Line Items] |  |  |
Amount | $ 516 | $ 243 |
Treasury stock | $ 13 |  | $ 19
Open Market Repurchases |  |  |
Shares Repurchase Activity [Line Items] |  |  |
Shares (in shares) | 85 | 41 |
Amount | $ 516 | $ 243 |

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