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Shareholders' equity Schedule of Dividends Declared (Details) | 12 Months Ended
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Dec. 31, 2018 $ / shares | Dec. 31, 2018 SFr / shares | Dec. 31, 2017 $ / shares | Dec. 31, 2017 SFr / shares | Dec. 31, 2016 $ / shares | Dec. 31, 2016 SFr / shares
Switzerland, Francs |  |  |  |  |  |
Dividends Declared [Line Items] |  |  |  |  |  |
Total dividend distributions per common share | SFr / shares |  | SFr 2.84 |  | SFr 2.76 |  | SFr 2.70
United States of America, Dollars |  |  |  |  |  |
Dividends Declared [Line Items] |  |  |  |  |  |
Total dividend distributions per common share | $ / shares | $ 2.90 |  | $ 2.82 |  | $ 2.74 |

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- Definition [Line Items] for Dividends Declared [Table] + 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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