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Stockholders' equity (Details Textual) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended		3 Months Ended
	Mar. 08, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Apr. 24, 2018	Jan. 31, 2018
Equity [Abstract]
Number of shares repurchased	52.1			56.4	3.4
Stock repurchase program, tender offer amount				$ 10,000,000,000
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)		$ 1.32	$ 1.32
Dividends paid per share (in usd per share)		$ 1.32		$ 1.32	$ 1.15
Stock Repurchase Program [Line Items]
Stock repurchase program, additional authorized amount							$ 10,000,000,000.0
Subsequent Event [Member]
Stock Repurchase Program [Line Items]
Stock repurchase program, additional authorized amount						$ 5,000,000,000.0

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- Definition

[Line Items] for Stock Repurchase Program [Table]

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Stock Repurchase Program, Tender Offer Amount

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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Aggregate dividends declared during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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