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Shareholders' Equity (Details)
SFr / shares in Units, $ / shares in Units, $ in Millions, SFr in Billions
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 18, 2015
USD ($)
May 31, 2015
USD ($)
installment
$ / shares
May 31, 2009
CHF (SFr)
May 31, 2009
USD ($)
Sep. 23, 2015
USD ($)
item
Sep. 30, 2015
USD ($)
Sep. 30, 2016
subsidiary
SFr / shares
shares
Dec. 31, 2015
SFr / shares
Dec. 31, 2015
USD ($)
shares
Oct. 29, 2015
SFr / shares
Oct. 29, 2015
USD ($)
Aug. 31, 2015
item
Jun. 30, 2015
item
May 31, 2014
installment
$ / 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 15.00   SFr 15.00        
Distribution of qualifying additional paid-in capital                            
Cash distribution approved in the form of additional paid-in capital (in dollars per share) | $ / shares   $ 0.60                       $ 3.00
Number of quarterly installments (in installments) | installment   4                       4
Amount of installment (in dollars per share) | $ / shares   $ 0.15                       $ 0.75
Liability for distribution payable   $ 218                        
Number of installments paid (in installments) | item         2             2 2  
Installment of dividend paid $ 272       $ 109 $ 381                
Cancellation of previously declared dividend                     $ 109      
Shares held in treasury                            
Authorized amount for repurchase of shares     SFr 3.5 $ 3,600                    
Treasury shares | shares                 2,863,267          
Treasury stock, value                 $ 240          
Shares held by subsidiary                            
Number of subsidiaries to whom shares were issued | subsidiary             1              
Number of shares held by subsidiary | shares             5,500,000   6,900,000