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Stockholders' equity (Details Textual) (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Class of Stock [Line Items] |  |  |  |  |
Stock repurchase program, additional authorized amount |  |  | $ 4,000,000,000.0 |  |
Amount available for stock repurchases under a board approved stock repurchase plan |  | $ 5,500,000,000 |  | $ 5,500,000,000 |
Dividends declared per share (in usd per share) |  | $ 1.60 | $ 1.60 | $ 1.60 | $ 1.45
Dividends paid per share (in usd per share) |  | $ 1.60 |  |  |
Forecast [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid per share (in usd per share) | $ 1.60 |  |  |  |

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