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Shareholders' Equity - Share-based Compensation, RSUs Activity (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Based Compensation, Restricted Stock Awards, Shares Outstanding   32,000,000 25,000,000 14,000,000
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 8,000,000 12,000,000 15,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (5,000,000) (4,000,000) (4,000,000)  
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (1,000,000) (1,000,000) 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 34,000,000 32,000,000 25,000,000  
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, Weighted Average Fair Value 8.68 10.18 15.43  
Share Based Compensation, Restricted Stock Units, Granted in Period, Weighted Average Fair Value 10.66 8.56 6.69  
Share Based Compensation, Restricted Stock Units, Vested, Weighted Average Fair Value 11.64 18.22 15.17  
Share Based Compensation, Restricted Stock Award, Canceled, Weighted Average Fair Value 8.57 10.36 13.94  
Outstanding, Weighted Average Fair Value 8.70 8.68 10.18