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Stockholders' equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Billions	1 Months Ended	3 Months Ended				9 Months Ended
	Oct. 31, 2025	Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount available for stock repurchases under a board approved stock repurchase plan		$ 6.8				$ 6.8
Common stock, dividends declared per share (in usd per share)		$ 2.38	$ 2.38	$ 2.38	$ 2.25	$ 2.38	$ 2.25
Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Common stock, dividends declared per share (in usd per share)	$ 2.38

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