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Shareholders' Equity (Stock Options Outstanding And Exercisable) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of Shares 25,610,000 27,043,000 27,881,000 28,964,000
Weighted Average Exercise Price (Per Share) $ 20.81 $ 20.06 $ 20.42 $ 20.09
Weighted Average Remaining Contractual Life (Years) 5 years 10 months 24 days      
Number of Shares 9,760,000 11,680,000 14,247,000  
Weighted Average Exercise Price (Per Share) $ 18.11      
First Range Of Exercise Prices [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of Shares 5,065,000      
Weighted Average Exercise Price (Per Share) $ 14.69      
Weighted Average Remaining Contractual Life (Years) 4 years 4 months 10 days      
Number of Shares 3,153,000      
Weighted Average Exercise Price (Per Share) $ 14.73      
Weighted Average Remaining Contractual Life (Years) 3 years 4 months 10 days      
Lower range $ 14.62      
Upper range $ 15.52      
Second Range Of Exercise Prices [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of Shares 5,999,000      
Weighted Average Exercise Price (Per Share) $ 16.87      
Weighted Average Remaining Contractual Life (Years) 7 years 9 months 22 days      
Number of Shares 1,647,000      
Weighted Average Exercise Price (Per Share) $ 17.63      
Weighted Average Remaining Contractual Life (Years) 6 years 11 months 1 day      
Lower range $ 15.77      
Upper range $ 17.65      
Third Range Of Exercise Prices [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of Shares 4,981,000      
Weighted Average Exercise Price (Per Share) $ 20.37      
Weighted Average Remaining Contractual Life (Years) 2 years 6 months 26 days      
Number of Shares 4,945,000      
Weighted Average Exercise Price (Per Share) $ 20.39      
Weighted Average Remaining Contractual Life (Years) 2 years 6 months 4 days      
Lower range $ 18.00      
Upper range $ 21.55      
Fourth Range Of Exercise Prices [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of Shares 5,143,000      
Weighted Average Exercise Price (Per Share) $ 23.19      
Weighted Average Remaining Contractual Life (Years) 8 years 11 months 9 days      
Number of Shares 0      
Weighted Average Exercise Price (Per Share) $ 0.00      
Lower range $ 22.45      
Upper range $ 23.86      
Fifth Range Of Exercise Prices [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of Shares 4,422,000      
Weighted Average Exercise Price (Per Share) $ 30.88      
Weighted Average Remaining Contractual Life (Years) 4 years 5 months 16 days      
Number of Shares 15,000      
Weighted Average Exercise Price (Per Share) $ 27.03      
Weighted Average Remaining Contractual Life (Years) 4 years      
Lower range $ 27.03      
Upper range $ 32.49