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

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Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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