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Stock-Based Compensation (Summary Of Changes Of Restricted Stock And Restricted Stock Units) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding Shares, Beginning of Period 3.7    
Granted, Shares 1.1    
Vested, Shares (1.5)    
Share Based Compensation, Equity Instruments Other Than Options, Expected To Vest 2.8    
Share Based Compensation, Equity Instruments Other Than Options, Expected To Vest, Weighted Avg Grant Date Fair Value $ 33    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 74.2 $ 41.0 $ 76.9
Weighted-Average Grant date Fair Value, Outstanding, Beginning of Period $ 26    
Granted, Weighted-Average Grant Date Fair Value 41 $ 33 $ 25
Vested, Weighted-Average Grant Date Fair Value 21    
Forfeited, Weighted-Average Grant Date Fair Value 30    
Weighted-Average Grant date Fair Value, Outstanding, End of Period $ 34 $ 26  
Forfeited, Shares (0.4)    
Outstanding Shares, End of Period 2.9 3.7