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Stockholders' Equity Stock Repurchase Program (Details) - 2016 Stock Repurchase Program - USD ($) shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 28, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |
Authorized amount |  |  | $ 12,000
Repurchases of common stock (in shares) | 12 | 13 |
Repurchases of common stock, amount | $ 834 | $ 1,000 |
Remaining authorized repurchase amount | $ 4,300 |  |

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