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Stockholders' equity (Details Textual) - USD ($) $ / shares in Units, $ in Billions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 24, 2017 | Sep. 30, 2013 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Amount available for stock repurchases under a board approved stock repurchase plan |  |  | $ 1.7 |  |  |  | $ 1.7 |
Dividends paid per share (in usd per share) |  | $ 1.15 | $ 1.15 | $ 1.15 | $ 1.15 | $ 1 | $ 3.45 | $ 3
Subsequent event [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Amount available for stock repurchases under a board approved stock repurchase plan | $ 5.0 |  |  |  |  |  |  |
Dividends declared per share (in usd per share) | $ 1.15 |  |  |  |  |  |  |

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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 + Details
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- Definition Aggregate dividends declared 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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