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Stockholders' equity (Details Textual) - USD ($)	1 Months Ended			3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2019	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	$ 4,700,000,000
Dividends declared per share (in usd per share)		$ 1.45	$ 1.45	$ 1.45	$ 1.32
Dividends paid per share (in usd per share)	$ 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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