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Stockholders' equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Billions
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Equity [Abstract]      
Amount available for stock repurchases under a board approved stock repurchase plan $ 6.8    
Dividends declared per share (in usd per share) $ 2.38 $ 2.38 $ 2.25