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Share-based Payments Share-Based Payments Stock Option Awards (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award      
Stock option awards, number outstanding, beginning of year 28,745,562    
Stock option awards, grants in period 4,168,996    
Stock option awards, exercises in period (996,325)    
Stock option awards, forfeitures in period (711,045)    
Stock option awards, number outstanding, end of year 31,207,188 28,745,562  
Stock option awards, vested and expected to vest, number 30,739,977    
Stock option awards, exercisable, number 23,830,228    
Stock option awards, outstanding, weighted average exercise price, beginning of year $ 14.54    
Stock option awards, grants in period, weighted average exercise price $ 9.52 $ 14.37 $ 6.62
Stock option awards, exercises in period, weighted average exercise price $ 6.13    
Stock option awards, forfeitures in period, weighted average exercise price $ 15.00    
Stock option awards, outstanding, weighted average exercise price, end of year $ 14.13 $ 14.54  
Stock option awards, vested and expected to vest, weighted average exercise price $ 14.18    
Stock option awards, exercisable, weighted average exercise price $ 15.20    
Stock option awards, vested and expected to vest, aggregate intrinsic value $ 21,200,000    
Stock option awards, vested and expected to vest, weighted average remaining contractual term 5 years 8 months 5 days    
Stock option awards, exercisable, intrinsic value 16,200,000    
Stock option awards, exercisable, weighted average remaining contractual term 4 years 10 months 13 days    
Stock option awards, exercises in period, total intrinsic value 4,600,000 42,700,000 12,900,000
Proceeds from exercise of stock options 6,108,000 59,077,000 10,123,000
Stock option awards, grants in period, weighted average grant date fair value $ 4.84 $ 6.49 $ 3.23
Stock option awards, vested in period, total fair value 20,900,000 26,700,000 41,700,000
Employee service share-based compensation, unvested awards, compensation cost not yet recognized $ 30,700,000    
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award      
Employee service share-based compensation, unvested awards, compensation cost not yet recognized, period for recognition 2 years 6 months 3 days    
Shares paid for tax withholding for share based compensation     55,625