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Shareholders' equity Dividends Declared (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 $ / shares | Mar. 31, 2019 SFr / shares | Mar. 31, 2018 $ / shares | Mar. 31, 2018 SFr / shares | May 31, 2018 $ / shares | May 31, 2017 $ / shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Annual dividend per share approved by shareholders |  |  |  |  | $ 2.92 | $ 2.84
Common Stock, Dividend Rate Approved |  |  |  |  | $ 0.73 | $ 0.71
United States of America, Dollars |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.73 |  | $ 0.71 |  |  |
Switzerland, Francs |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | SFr / shares |  | SFr 0.72 |  | SFr 0.66 |  |

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- Definition Annual dividend per share approved by shareholders + References No definition available. + Details
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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 + Details
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