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Common Stock (Details) - USD ($) shares in Millions, $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Nov. 30, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |
Payments for repurchase of common stock | $ 500 | $ 400 |
Stock-based compensation, shares issued during period | 2.5 | 3.7 |
Common Stock |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Common stock repurchased (in shares) | 6.1 | 5.4 |
Payments for repurchase of common stock | $ 500 | $ 400 |
Share repurchases program, authorized amount (up to) |  |  | $ 2,500
Stock repurchase program, remaining authorized repurchase amount | $ 1,000 |  |

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