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Shareholders' Equity (Details) SFr / shares in Units, shares in Millions, SFr in Billions, $ in Billions |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 07, 2016 shares | May 31, 2009 CHF (SFr) | May 31, 2009 USD ($) | Jun. 30, 2017 subsidiary SFr / shares shares | Dec. 31, 2016 SFr / shares shares | Oct. 29, 2015 SFr / shares
Par value reduction |  |  |  |  |  |
Approved par value of common stock (in Swiss francs per share) | SFr / shares |  |  |  |  |  | SFr 0.10
Par value of common stock (in Swiss francs per share) | SFr / shares |  |  |  | SFr 0.10 | SFr 0.10 | SFr 15.00
Shares held in treasury |  |  |  |  |  |
Authorized amount for repurchase of shares |  | SFr 3.5 | $ 3.6 |  |  |
Shares repurchased and cancelled (in shares) | shares | 2.9 |  |  |  |  |
Shares held by subsidiary |  |  |  |  |  |
Number of subsidiaries to whom shares were issued | subsidiary |  |  |  | 2 |  |
Number of shares held by subsidiary | shares |  |  |  | 3.6 | 5.4 |

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