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Shareholders' equity Shareholders' equity (Details) $ / shares in Units, $ in Billions | Sep. 30, 2017 SFr / shares shares | May 31, 2017 $ / shares | Dec. 31, 2016 SFr / shares shares | Nov. 30, 2016 USD ($) | May 31, 2016 $ / shares | May 31, 2015 $ / shares
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Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Common Shares, par value | SFr / shares | SFr 24.15 |  | SFr 24.15 |  |  |
Common Shares in treasury, shares | shares | 15,625,345 |  | 13,815,148 |  |  |
Common Stock, Dividend Rate Approved |  | $ 0.71 |  |  | $ 0.69 | $ 0.67
Annual dividend per share approved by shareholders |  | $ 2.84 |  |  | $ 2.76 | $ 2.68
Nov 2016 Stock Repurchase Plan [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorized amount of share repurchase program | $ |  |  |  | $ 1 |  |

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + 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 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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