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v3.19.1

Stockholders' equity (Details Textual) - USD ($) $ / shares in Units, $ in Billions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Equity [Abstract] |  |  |  |
Amount available for stock repurchases under a board approved stock repurchase plan | $ 2.1 |  | $ 2.1 |
Dividends declared per share (in usd per share) | $ 1.45 | $ 1.45 | $ 1.45 | $ 1.32
Dividends paid per share (in usd per share) | $ 1.45 |  |  |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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