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Stockholders' Equity - Schedule of Repurchase Agreements (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Shares Repurchase Activity [Line Items] |  |  |
Amount | $ 2,159 | $ 1,297 | $ 1,403
Open Market Repurchases |  |  |
Shares Repurchase Activity [Line Items] |  |  |
Shares (in shares) | 364 | 209 | 271
Amount | $ 2,159 | $ 1,297 | $ 1,403

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