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Stockholders' equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Billions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Oct. 31, 2024
Class of Stock [Line Items] |  |  |  |  |  |
Amount available for stock repurchases under a board approved stock repurchase plan | $ 7.0 |  |  |  |  |
Dividends declared per share (in usd per share) | $ 2.25 | $ 2.25 | $ 2.25 | $ 2.13 | $ 2.13 |
Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividends payable per share (in usd per share) |  |  |  |  |  | $ 2.25

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