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Stockholders' equity (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | May 31, 2019
Equity [Abstract] |  |  |  |  |  |
Stock repurchase program, additional authorized amount |  |  |  |  |  | $ 5,000,000,000.0
Amount available for stock repurchases under a board approved stock repurchase plan | $ 4,700,000,000 |  |  |  |  |
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 | $ 1.45 |  |  |  |

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