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Stockholders' equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Billions
1 Months Ended 3 Months Ended
Aug. 06, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
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
Dividends paid per share (in usd per share)     $ 2.25 $ 2.25      
Subsequent Event              
Class of Stock [Line Items]              
Dividends declared per share (in usd per share) $ 2.25            
Forecast              
Class of Stock [Line Items]              
Dividends paid per share (in usd per share)   $ 2.25