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Stockholders' equity (Details Textual) - USD ($)	1 Months Ended						3 Months Ended
	Oct. 31, 2019	Sep. 30, 2019	Aug. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	May 31, 2019
Equity [Abstract]
Stock repurchase program, additional authorized amount											$ 5,000,000,000.0
Amount available for stock repurchases under a board approved stock repurchase plan		$ 3,600,000,000					$ 3,600,000,000
Dividends declared per share (in usd per share)	$ 1.45		$ 1.45		$ 1.45	$ 1.45	$ 1.45	$ 1.45	$ 1.32	$ 1.32
Dividends paid per share (in usd per share)		$ 1.45		$ 1.45	$ 1.45

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- References

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X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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