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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