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Stockholders' equity (Details Textual) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 08, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Jul. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, additional authorized amount |  |  |  |  | $ 3,400,000,000 |  |  |  |  |  |
Amount available for stock repurchases under a board approved stock repurchase plan |  |  | $ 2,900,000,000 |  |  |  |  | $ 2,900,000,000 |  |  |
Dividends declared per share (in usd per share) |  |  |  | $ 1.76 |  | $ 1.76 | $ 1.76 | $ 1.76 | $ 1.76 | $ 1.60 | $ 1.60
Dividends paid per share (in usd per share) |  |  | $ 1.76 |  | $ 1.76 | $ 1.76 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in usd per share) |  | $ 1.76 |  |  |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends paid per share (in usd per share) | $ 1.76 |  |  |  |  |  |  |  |  |  |

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