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Shareholders' Equity (Details)
In Millions, except Share data
1 Months Ended3 Months Ended9 Months Ended12 Months Ended3 Months Ended9 Months Ended
Aug. 31, 2011
USD ($)
Nov. 30, 2010
USD ($)
Sep. 30, 2011
USD ($)
Sep. 30, 2011
CHF
Jun. 30, 2011
USD ($)
Jun. 30, 2011
CHF
Mar. 31, 2011
USD ($)
Sep. 30, 2010
USD ($)
Sep. 30, 2011
USD ($)
Sep. 30, 2010
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2010
CHF
Mar. 31, 2011
Common Stock Par Value [Member]
CHF
Sep. 30, 2010
Common Stock Par Value [Member]
CHF
Sep. 30, 2010
Common Stock Par Value [Member]
CHF
Common shares - par value    30.27        30.57   
Dividends declared per common share  $ 0.35 0.31$ 0.35 0.29$ 0.33$ 0.33 $ 0.97   0.30 0.32 0.99
Common shares in treasury, shares  6,442,1196,442,119    6,442,119 6,151,707    
Stock repurchase program, authorized amount$ 303$ 600             
Repurchase of outstanding common shares  1,600,0001,600,000    1,600,000 4,900,000    
Transaction cost        100 303    
Share repurchase authorization remains$ 197       $ 500